Assisted Migration
Assisted Migration
Assisted migration is the deliberate movement of organisms, populations, seeds, or genetic material to locations expected to become more suitable as environmental conditions change. It is also described as assisted colonization, managed relocation, facilitated migration, assisted population migration, assisted range expansion, and, in some contexts, assisted gene flow.
The concept has become increasingly important as climate change shifts temperature and precipitation patterns faster than many species can naturally migrate or adapt. Habitat fragmentation, cities, agriculture, roads, mountains, water bodies, and other barriers can further prevent organisms from reaching newly suitable habitat.
Assisted migration represents a major change in conservation thinking. Traditional conservation often seeks to protect species within their historical ranges and preserve ecosystems resembling past conditions. Climate change challenges that approach because the environmental conditions that supported historical communities may move, disappear, or be replaced by climates with no close historical equivalent.
Supporters therefore view assisted migration as a possible tool for preventing extinction, sustaining forests, maintaining ecosystem services, and helping populations remain matched to suitable climates. Critics warn that moving organisms can introduce new ecological interactions, diseases, invasive species, maladapted populations, and other unintended consequences.
The scientific literature increasingly treats assisted migration not as a simple choice between moving and not moving species, but as a continuum of interventions whose risks and benefits depend on the organism, distance moved, destination ecosystem, conservation objective, climate projections, and consequences of taking no action.
Climate Change and the Need for Assisted Migration
Climate change is shifting the geographic distribution of suitable habitats. Species have historically responded to climatic changes through migration, adaptation, or local extinction, but modern climate change is occurring within landscapes profoundly altered by human activity.
Many plants and animals cannot disperse quickly enough to follow shifting climatic conditions. Long-lived trees are particularly important examples because forests established today may experience substantially different climates decades from now.
Populations at the warm or dry edges of species ranges can become increasingly maladapted as temperature and drought conditions exceed those under which they evolved. At the same time, areas farther north or at higher elevations may become climatically suitable before species can naturally reach them.
Assisted migration attempts to close this gap between the speed of environmental change and the speed of biological movement.
The need for intervention varies considerably among species. Some organisms disperse readily and may track changing climates without human assistance. Others are restricted by fragmented habitat, specialized ecological relationships, isolated mountaintops, disconnected watersheds, or extremely slow generation times.
Because of these differences, assisted migration is increasingly considered alongside habitat protection, ecological connectivity, restoration, seed banking, captive breeding, genetic rescue, and other climate-adaptation strategies rather than as a universal replacement for traditional conservation.
Forest Assisted Migration
Forestry has become one of the largest areas of practical assisted-migration research.
Forest managers have traditionally favored locally collected seed because local populations were assumed to be best adapted to local conditions. Climate change complicates that assumption. Seedlings planted today may mature under temperatures and precipitation regimes very different from those experienced by the parent trees.
Forest assisted migration can occur at several scales.
Assisted population migration moves populations or seed sources within a species' existing geographic range.
Assisted range expansion moves populations just beyond the present range toward areas expected to become suitable.
Assisted species migration moves an entire species farther beyond its historical distribution.
The farther an organism is moved, the greater the potential ecological uncertainty generally becomes.
Long-term provenance trials have become particularly valuable because they allow researchers to compare trees originating from different climates. Studies involving lodgepole pine, white spruce, eastern white pine, red spruce, oak, Douglas-fir, western larch, and many other species show that the climate of a seed source can strongly influence growth, drought resistance, frost tolerance, and survival.
Large experimental networks are now testing future-climate planting strategies across North America and Europe. Forest managers are also incorporating assisted migration into post-fire restoration, silvicultural experiments, regeneration systems, and operational planting programs.
Research increasingly suggests that some forests may require active changes in seed sources or species composition if they are to continue providing timber, wildlife habitat, carbon storage, watershed protection, and other ecosystem services under future climates.
Seed Sourcing, Provenance, and Assisted Gene Flow
One of the least disruptive forms of climate-assisted movement involves changing where seeds or genetic material are obtained rather than relocating entire species.
Traditional restoration frequently emphasizes local provenance. Climate-oriented restoration instead asks whether local populations will remain adapted to future conditions.
Several alternative strategies have emerged.
Predictive provenancing uses climate projections to select populations expected to be adapted to future conditions.
Climate-adjusted provenancing combines local seed with material originating from populations already experiencing warmer or otherwise future-like climates.
Climate-based seed transfer replaces fixed geographic seed zones with transfer rules based partly on climatic similarity.
Assisted gene flow deliberately moves genes among populations so climate-adapted genetic variation can spread more rapidly.
Genomic research is increasingly being used to identify adaptive variation and improve seed-transfer decisions. Climate-analogue models can also identify locations whose present climates resemble those expected at a restoration site in future decades.
New approaches extend the concept even further. Pollen-based assisted migration, for example, proposes moving adaptive genes through pollen rather than transporting entire populations.
These strategies may reduce some ecological risks associated with moving whole species, but they still require attention to genetic diversity, outbreeding, maladaptation, disease, phenology, and interactions with local ecological communities.
Conservation Translocations and Species Survival
Although forestry dominates much of the practical literature, assisted migration can also be used specifically to prevent species extinction.
Potential candidates include species whose future suitable habitat lies outside their natural dispersal range or beyond barriers they cannot cross.
Research and experimental programs have examined assisted migration involving rare plants, butterflies, mammals, reptiles, amphibians, freshwater organisms, and threatened trees.
One prominent example involves the forests used by monarch butterflies in central Mexico. Climate change threatens the high-elevation oyamel fir forests where monarchs overwinter. Researchers have experimentally moved oyamel seedlings upslope in an attempt to establish future forests under cooler conditions.
Joshua trees provide another example. Increasing heat and drought threaten portions of their current range, leading researchers to investigate whether populations could survive in cooler locations outside areas where they currently occur.
Whitebark pine has also played an important role in the development of assisted-migration research. Experimental plantings beyond portions of its existing range have tested whether climate models can identify places where future populations may survive.
Animal relocation presents additional challenges. Animals may require prey, pollinators, competitors, nesting habitats, migration routes, or other ecological relationships that are difficult to recreate merely by moving individuals.
Species therefore cannot always be treated as isolated units. Conservationists increasingly recognize that moving one organism may also require understanding the ecological community on which it depends.
Ecological Restoration and Future Ecosystems
Assisted migration is closely connected to a broader transformation in ecological restoration.
Traditional restoration often attempts to reconstruct historical ecosystems. Climate change raises the possibility that historical combinations of species may no longer be sustainable at particular locations.
Restoration practitioners are therefore increasingly considering what ecosystems can persist under future conditions rather than exclusively asking what existed at a site in the past.
Concepts such as climate-adjusted provenancing and "prestoration" reflect this change. Prestoration seeks to establish species that can survive both present conditions and the climates expected in coming decades.
Community-level assisted migration goes further by considering the movement of groups of species rather than isolated populations.
Urban environments may also play a role. Cities often experience warmer temperatures than surrounding countryside and can act as experimental stepping stones for species whose climatic ranges are shifting poleward.
Assisted migration can therefore overlap with reforestation, prairie restoration, urban forestry, post-fire recovery, rare-plant restoration, coral restoration, and efforts to sustain ecosystem services.
This does not mean that ecological history is irrelevant. Rather, restoration increasingly involves balancing historical knowledge with predictions about rapidly changing future environments.
Risks and Ecological Uncertainty
The principal ecological objection to assisted migration is that relocated organisms may produce unintended effects in recipient ecosystems.
Introduced species can become invasive, compete with native organisms, spread pathogens, hybridize with local populations, alter food webs, or change ecosystem processes.
Even species that do not become invasive may fail because climate is only one factor determining whether a population can survive.
Soils, moisture, frost, competitors, predators, herbivores, pollinators, diseases, pathogens, and other ecological interactions can determine whether a relocation succeeds.
Moving organisms too far can also create maladaptation. Populations originating in warmer climates may grow rapidly at northern planting sites but suffer frost damage or other climatic stresses.
Ecological relationships create additional uncertainty. Moving a threatened host species without its specialized mutualists or dependent organisms could conserve the host while unintentionally contributing to the extinction of other species.
For this reason, many researchers favor gradual movement, experimental plantings, multiple candidate populations, long-term monitoring, and adaptive management rather than immediate large-scale relocation.
Assisted migration is increasingly treated as an experiment that must be evaluated throughout the lifetime of the relocated population.
Risk of Action Versus Risk of Inaction
One of the most important changes in the assisted-migration debate has been recognition that doing nothing is also a decision with consequences.
Early criticism often emphasized the ecological dangers of introducing species into new locations. Later decision frameworks increasingly compare those risks with the possibility that refusing to intervene could allow populations or entire species to disappear.
This creates a two-sided precaution problem.
Moving a species can produce irreversible ecological effects.
Failing to move a species can produce irreversible extinction.
The appropriate decision therefore depends on the relative probability and severity of both outcomes.
Decision frameworks commonly consider factors including extinction risk, probability of successful establishment, invasiveness, ecological interactions, availability of suitable destination habitat, feasibility, economic cost, monitoring capacity, reversibility, and alternative conservation strategies.
Small-scale trials can sometimes reduce uncertainty before larger movements are attempted.
Policy, Law, and Governance
Assisted migration raises difficult legal and institutional questions because conservation laws were generally created around relatively stable concepts of native range, historical habitat, and jurisdiction.
Climate change undermines some of those assumptions.
A species' future suitable habitat may occur outside the park, state, province, or country where it is currently protected. Conservation agencies may therefore have responsibility for species that can no longer survive within existing protected boundaries.
Legal scholarship has examined assisted migration under endangered-species law, international environmental law, biodiversity conventions, climate agreements, and national conservation systems.
Policy development remains uneven. Some forestry agencies have already incorporated climate-based seed transfer and assisted population migration into management, while other jurisdictions lack clear authority or guidance.
Governance questions extend beyond formal law.
Decisions involve landowners, Indigenous peoples, scientists, forest managers, government agencies, conservation organizations, local communities, and the broader public.
Research on public attitudes generally finds neither unconditional acceptance nor blanket rejection. People frequently support cautious experimentation when intervention is clearly justified, risks are acknowledged, monitoring is rigorous, and decision-making is transparent.
Trust in institutions is therefore a significant factor in whether assisted-migration programs receive public support.
Ethics and the Assisted-Migration Debate
Assisted migration challenges fundamental assumptions about what conservation is supposed to preserve.
One ethical position emphasizes ecological integrity and argues that deliberately moving organisms outside historical ranges risks replacing natural communities with human-designed ecosystems.
Another emphasizes responsibility. Because human activities are driving modern climate change, proponents argue that humans may have an obligation to help species survive environmental changes they did not cause.
A third perspective questions whether the distinction between intervention and non-intervention remains meaningful in landscapes already transformed by climate change, habitat fragmentation, pollution, invasive species, agriculture, and urban development.
The debate also concerns the meaning of "native" and "natural." A species moving naturally into a newly suitable region may be considered part of climate adaptation, while the same species moved by humans may be classified as introduced.
These distinctions become increasingly difficult as climate zones move across static political and ecological boundaries.
Some critics describe assisted migration as a technological fix that could distract attention from reducing greenhouse-gas emissions, protecting habitat, or restoring ecological connectivity.
Supporters generally respond that assisted migration should supplement rather than replace those measures.
The disagreement is therefore partly scientific but also reflects competing values concerning wildness, intervention, precaution, responsibility, historical ecosystems, and acceptable environmental change.
From Controversial Idea to Climate-Adaptation Tool
Modern debate over assisted migration accelerated during the 2000s as scientists recognized that protected areas alone might not preserve species whose climatic habitats were moving.
Early literature frequently presented assisted colonization as a controversial last resort.
Over time, the field became more differentiated.
Scientists increasingly distinguished between moving genes, moving populations within existing ranges, expanding species slightly beyond their ranges, and relocating organisms across large geographic distances.
Forestry provided opportunities to test these ideas through existing provenance experiments and seed-transfer programs.
Restoration ecology developed climate-adjusted approaches to seed sourcing.
Conservation biology produced decision frameworks comparing intervention with extinction risk.
Government agencies began developing managed-relocation guidance and climate-adaptive planting programs.
By the 2020s, assisted migration had moved from a largely theoretical debate toward experimental and, in some cases, operational implementation.
The central question is increasingly not simply whether assisted migration should ever occur, but under what conditions, at what scale, with which organisms, and with what safeguards.
Conclusion
Assisted migration reflects one of the central dilemmas of conservation in a rapidly changing climate: protecting biodiversity may increasingly require changing where organisms live rather than attempting to hold ecological communities permanently in place.
Evidence from forestry, restoration, conservation genetics, species translocations, climate modeling, and long-term field experiments suggests that carefully designed movement can sometimes improve the ability of populations to survive changing conditions.
At the same time, assisted migration carries genuine ecological, genetic, social, legal, and ethical risks.
The strongest emerging approach is therefore neither unrestricted relocation nor categorical rejection. It is cautious, evidence-based intervention that compares the consequences of action with the consequences of inaction.
Where possible, managers can begin with relatively low-risk measures such as climate-informed seed sourcing, assisted gene flow, habitat connectivity, experimental plantings, and short-distance range expansion before considering more radical relocation.
As climate change continues to alter ecosystems, conservation will increasingly have to decide whether preserving biodiversity means preserving historical locations or helping species survive in new ones. Assisted migration places that difficult choice at the center of twenty-first-century conservation.
Assisted Migration — Categorized, Deduplicated, and Reverse Chronological
Current Resources and Ongoing Programs
1. Mixing Seed Sources for Assisted Migration and Population Fitness | Canadian Forest Service | Natural Resources Canada | Current research
Eastern white pine trials compare local and more southerly seed sources to explore whether mixing provenances can improve growth and genetic resilience.
2. Assisted Migration Adaptation Trial | Government of British Columbia | Province of British Columbia | Current resource
British Columbia's large-scale AMAT experiment tests numerous tree populations across climatic gradients to guide climate-based seed transfer.
3. Whitebark and Limber Pine Recovery | Government of Alberta | Alberta Environment and Protected Areas | Current resource
Recovery programs for these climate-sensitive high-elevation trees combine restoration, disease resistance, seed conservation, and consideration of planting outside currently occupied sites.
4. Assisted Migration (Forests) | Handler et al. | USDA Climate Hubs | Current resource
This USDA overview explains assisted population migration, assisted range expansion, seed-source selection, ecological risks, policy barriers, and decision-support tools available to forest managers.
Forest Assisted Migration, Silviculture, and Field Trials
5. New Trees on Old Lands: A Consideration of Forest-Assisted Migration on Colorado Burn Scars | Gregory Russell, Eliisa Carter & Courtney Schultz | Regional Environmental Change | 2026-08-12
Interviews following two major Colorado wildfires reveal competing views of forest assisted migration and identify policy, leadership, seed-zone, and institutional barriers to using it in post-fire reforestation.
6. The Influence of Provenance on Climate Response and Drought Resilience of Lodgepole Pine in the Southern Rocky Mountains | Warnick et al. | Forest Ecology and Management / USDA Forest Service | 2026
Long-term lodgepole pine provenance trials show that source climate can affect drought resistance and resilience, providing practical evidence for climate-informed seed sourcing and forest assisted migration.
7. High Productivity of Tree Species Planted Outside Their Current Geographic Range Indicates Large Regions of Unrealized Niche Space | Griesbauer, O’Neill & MacKenzie | Frontiers in Plant Science | 2025-08-28
Plantations beyond current tree ranges reveal that some species can grow productively in climates they do not naturally occupy, suggesting substantial potential for carefully planned assisted range expansion.
8. Seeds of Change: Assisted Migration and the Future of Forests | Joseph Phillips | USDA Forest Service | 2025-05-15
This accessible overview describes Forest Service experiments designed to determine which tree species and seed sources can establish forests suited to future climates.
9. Field Note: Learning from Early Application of a Transition Forest Climate Adaptation Planting Strategy Incorporating Assisted Migration in Southern New England | Christopher C. Riely, Robert W. MacMillan, Maria K. Janowiak & Richard H. Blodgett | Journal of Forestry | 2025-04-28
Ten years of monitoring an operational Rhode Island planting highlight both the promise of climate-adapted tree introductions and the major influence of deer herbivory on establishment.
10. Evaluating the Effectiveness of Climate-Based Seed Transfer and Assisted Migration in Western Canada | Luo et al. | Annals of Forest Science | 2025-02-17
Lodgepole pine and interior spruce trials show how climate-based seed-transfer systems can enlarge deployment areas while assisted migration may improve growth under warming conditions.
11. Can Tree-Rings Inform Assisted Migration? Revisiting Provenance Trials Across Atlantic Canada | D’Orangeville et al. | Forest Ecology and Management | 2025-02-15
Six decades of red spruce provenance data indicate that populations moved toward colder locations may be less sensitive to summer moisture stress, supporting cautious assisted migration.
12. Editorial: Forest Assisted Migration | Marquardt, Palik, Nolet & Munson | Frontiers in Forests and Global Change | 2025-01-29
This editorial synthesizes recent research on genetics, field trials, public acceptance, silviculture, seed-transfer models, and other dimensions of forest assisted migration.
13. Practitioner Perspectives on Assisted Migration and Adapting Reforestation for Climate Change in the Western US | Michelle Agne & Robert A. Slesak | Journal of Forestry | 2025
A survey of western U.S. forest managers finds substantial experimentation with assisted migration but persistent constraints involving seed availability, uncertainty, policy, and organizational capacity.
14. Assisted Migration of Cloud Forest Trees: Unearthing the Effects of Climatic Transfer Distance | Authors | Journal of Environmental Management | 2025
Experimental transfers of tropical cloud-forest trees show declining performance with greater climatic transfer distance while suggesting that some shade-tolerant species possess substantial climatic flexibility.
15. Moving Up North: How Do Translocated Seedlings Perform in Mixed-Species Plantings at the Boreal-Temperate Interface? | Patricia Raymond et al. | Forest Ecology and Management | 2025
Mixed-species experiments near the boreal-temperate transition test how seedlings moved northward survive and grow when exposed to novel climate, competition, and herbivory.
16. Assessing Assisted Population Migration for Eastern White Pine at Northern Planting Sites | Lu et al. | Forest Ecology and Management | 2024-11-15
Provenance trials explore whether moving eastern white pine seed sources northward can improve growth while maintaining acceptable survival under future climates.
17. A Practical Framework for Applied Forestry Assisted Migration | Bower et al. | Frontiers in Forests and Global Change | 2024-10-30
A practical framework translates assisted-migration theory into planning steps that forest managers can apply when choosing species, seed sources, planting locations, and monitoring programs.
18. Forest Assisted Migration and Adaptation Plantings in the Northeastern US | Clark et al. | Frontiers in Forests and Global Change | 2024-10-08
Interviews with early adopters document how northeastern U.S. managers are experimenting with adaptation plantings while remaining cautious about long-distance and exotic-species movements.
19. Factors Affecting Early Red Oak Regeneration Near Its Northern Distribution Limit in Quebec | Simon Lebel Desrosiers et al. | Frontiers in Forests and Global Change | 2024-09-23
Research near red oak's northern range boundary evaluates regeneration conditions relevant to decisions about promoting northward expansion under climate warming.
20. Adapting the Patch-Cut System to Implement Forest Assisted Migration | Nolet, Béland & Messier | Frontiers in Forests and Global Change | 2024-09-13
The authors propose incorporating climate-adapted tree species and populations into patch cuts, allowing assisted migration to be tested gradually within managed forests.
21. Assisted Migration Outcomes for Oak Species and Seed Sources in Southern Ontario | Pedlar et al. | Frontiers in Forests and Global Change | 2024-08-26
Long-term plantings of oak species and southern seed sources in Ontario demonstrate that assisted range expansion of some broadleaf trees may be feasible.
22. Assessing Assisted Migration Under Climate Change Scenarios | USDA Forest Service Northern Research Station | Rooted in Research | 2024-08
Forest landscape simulations evaluate whether assisted migration can maintain forest composition and ecosystem services under different levels of future warming.
23. Assisted Tree Migration Can Preserve the European Forest Carbon Sink Under Climate Change | Chakraborty et al. | Nature Climate Change | 2024-07-25
Modeling suggests that moving climate-adapted tree provenances could help European forests retain substantially more carbon than reliance on local seed sources alone.
24. The Swiss Common Garden Network: Testing Assisted Migration of Tree Species in Europe | Streit et al. | Frontiers in Forests and Global Change | 2024-06-25
A network of dozens of sites, species, and seed sources is testing which European trees and provenances can tolerate climatic conditions expected under future warming.
25. Living the DREAM: Implementing Desired REgeneration Through Assisted Migration | USDA Forest Service Northern Research Station | Rooted in Research | 2024-05
The DREAM framework provides managers with a practical structure for selecting desired future regeneration and incorporating assisted migration into climate-adaptive silviculture.
26. Can Assisted Migration Mitigate Climate-Change Impacts on Forests? | Xu & Prescott | Forest Ecology and Management | 2024-03-15
This review evaluates evidence for forest assisted migration, including potential gains in adaptation and productivity alongside risks of maladaptation, invasion, and ecological disruption.
27. Framing Recent Advances in Assisted Migration of Trees | Stanturf, Ivetić & Dumroese | Forest Ecology and Management | 2024-01-01
An introduction to recent research explains why conventional assumptions about local seed sources are increasingly challenged by rapid climate change.
28. Tree Movements Promote Carbon Sink | John Pedlar | Nature Climate Change | 2024
This commentary examines evidence that shifting tree populations toward climates to which they are better adapted could help maintain forest productivity and carbon storage.
29. Trailing-Edge Contractions Are Common in Interior Western US Trees Under Varying Disturbances | Katherine M. Nigro, Kristen Pelz & Miranda D. Redmond | Nature Climate Change | 2024
Widespread contraction at warm, dry range margins suggests that natural redistribution may be insufficient for some western trees and strengthens arguments for assisted movement.
30. Can Assisted Tree Migration Today Sustain Forest Ecosystem Goods and Services for the Future? | Gustafson, Kern & Kabrick | Forest Ecology and Management | 2023-02-01
Landscape simulations show that assisted migration may maintain some forest functions under moderate climate change but becomes insufficient under severe warming.
31. Desired REgeneration Through Assisted Migration (DREAM): Implementing a Research Framework for Climate-Adaptive Silviculture | Alejandro A. Royo et al. | Forest Ecology and Management | 2023
The DREAM network integrates assisted migration with silviculture experiments to test the performance of future-climate tree species and seed sources across eastern North America.
32. Provenance Trials in the Service of Forestry Assisted Migration: A Review of North American Field Trials and Experiments | Andrew M. Park & Jesse L. Rodgers | Forest Ecology and Management | 2023
This review assesses decades of provenance trials as an evidence base for deciding which forest populations might safely and effectively be moved.
33. As Tree Species Face Decline, ‘Assisted Migration’ Gains Popularity in Pacific Northwest | Associated Press | AP News | 2023
Forest managers in the Pacific Northwest are increasingly experimenting with seeds and trees from warmer locations as traditional reforestation assumptions become less reliable.
34. Adaptation of White Spruce to Climatic Risk Environments in Spring: Implications for Assisted Migration | Casmey, Hamann & Hacke | Forest Ecology and Management | 2022-12-01
Range-wide provenance experiments suggest that moderate northward movement of southern white spruce may improve growth without creating major spring-phenology risks.
35. Operationalizing Forest-Assisted Migration in the Context of Climate Change Adaptation | Palik et al. | Ecosphere | 2022
Three eastern U.S. case studies show how assisted migration can move from experimental theory toward operational forest management.
36. Enhancing Forest Resilience: Advances in Ontario's Wild Tree Seed Transfer Policy | van Kerkhof et al. | The Forestry Chronicle | 2022
Ontario's evolving seed-transfer policy illustrates how forestry agencies can incorporate climate projections and assisted population migration into routine regeneration.
37. Assisted Migration Field Tests in Canada and Mexico: Lessons, Limitations, and Challenges | Sáenz-Romero et al. | Forests | 2021
Whitebark pine, interior spruce, and oyamel fir field trials illustrate both the potential and practical uncertainty involved in relocating climate-sensitive tree populations.
38. Cities as Hot Stepping Stones for Tree Migration | Authors | npj Urban Sustainability | 2021
Urban heat islands may allow warm-adapted tree species to establish farther north before surrounding rural climates become suitable, effectively creating migration stepping stones.
39. Xylem Anomalies as Indicators of Maladaptation to Climate in Forest Trees | Sebastian-Azcona, Hacke & Hamann | Frontiers in Plant Science | 2020-02-27
Tree-ring anatomy provides another indicator for detecting climatic maladaptation and evaluating the risks of transferring tree populations.
40. Assisted Gene Flow in the Context of Large-Scale Forest Management in California | Young et al. | Ecosphere | 2020
Post-fire restoration experiments compare local seedlings with warmer-source provenances to evaluate whether assisted gene flow can improve forest resilience in California.
41. Assisted Migration Across Fixed Seed Zones Detects Adaptation Lags in Two Major North American Tree Species | Julie R. Etterson, Meredith W. Cornett, Mark A. White & Laura C. Kavajecz | Ecological Applications | 2020
Reciprocal planting experiments demonstrate climatic adaptation lags in northern tree populations and provide empirical support for modifying traditional seed-zone boundaries.
42. “Playing the Hand of God”: Scientists’ Experiment Aims to Help Trees Survive Climate Change | Authors | The Guardian | 2020
This feature follows assisted-migration experiments that deliberately move tree populations toward cooler regions as warming outpaces natural forest migration.
43. Survival, Growth and Cold Hardiness Tradeoffs in White Spruce Populations | Sebastian-Azcona et al. | Forest Ecology and Management | 2019
White spruce trials quantify how far populations may be moved north before increased growth begins to conflict with frost hardiness and survival.
44. Effects of Environmental Filters on Early Establishment of Cloud Forest Trees Along Elevation Gradients: Implications for Assisted Migration | María de los Ángeles García-Hernández et al. | Forest Ecology and Management | 2019
Seedling trials across elevation gradients find that several cloud-forest trees can survive above current distributional limits, supporting cautious upslope relocation.
45. Survival of Whitebark Pine Seedlings Grown from Direct Seeding: Implications for Regeneration and Restoration Under Climate Change | Authors | Forests | 2019
Direct-seeding experiments provide information for restoring whitebark pine and determining how regeneration methods can support future climate-driven range adjustments.
46. Cold Adaptation Recorded in Tree Rings Highlights Risks Associated with Climate Change and Assisted Migration | Authors | Nature Communications | 2018
Lodgepole pine tree rings reveal strong climatic adaptation and show why moving populations too far can create risks even when warmer-source trees initially appear advantageous.
47. Lack of Local Adaptation Limits Assisted Migration in Drought-Prone Pinus nigra | Tíscar, Lucas-Borja & Candel-Pérez | Forest Ecology and Management | 2018
Reciprocal transplant experiments show that assisted migration is not automatically beneficial and that establishment-stage drought can override provenance advantages.
48. Trees for Tomorrow: An Evaluation Framework to Assess Potential Candidates for Assisted Migration to Manitoba’s Forests | Authors | New Forests | 2018
A screening framework evaluates which tree species might be reasonable candidates for northward movement into Manitoba as regional climates change.
49. Assisted Migration of Forest Populations for Adapting Trees to Climate Change | Sáenz-Romero et al. | Revista Chapingo / USDA Forest Service | 2016
The review describes how forest populations could be realigned with the climates to which they are adapted when natural migration is too slow.
50. Planning the Future's Forests with Assisted Migration | Williams & Dumroese | Forest Conservation in the Anthropocene | 2016
This chapter explains how future reforestation may require seed sources or species adapted to conditions different from those at planting sites today.
51. The Right Tree at the Right Place? Exploring Urban Foresters’ Perceptions of Assisted Migration | Authors | Urban Forestry & Urban Greening | 2016
Interviews with Ontario urban foresters find qualified support for assisted migration but limited implementation, experimentation, and government direction.
52. A Bridge Too Far: Cold and Pathogen Constraints to Assisted Migration of Riparian Forests | Grady et al. | Restoration Ecology | 2015
The study demonstrates that climatic suitability alone does not guarantee successful migration because cold limits, diseases, and other biological interactions can restrict transplanted populations.
53. Plants on the Move: Assisted Migration of Forest Trees in the Face of Climate Change | Tomasz E. Koralewski, Hsiao-Hsuan Wang, William E. Grant & Thomas D. Byram | Forest Ecology and Management | 2015
The authors develop a quantitative method for choosing planting material under uncertain future climates while accounting for genetic and environmental influences.
54. Considerations for Restoring Temperate Forests of Tomorrow: Forest Restoration, Assisted Migration, and Bioengineering | R. Kasten Dumroese, Mary I. Williams, John A. Stanturf & J. Bradley St. Clair | New Forests | 2015
The authors examine assisted migration alongside functional restoration and biotechnology as possible tools for maintaining forest functions under rapid environmental change.
55. Pushing the Pace of Tree Species Migration | Eli D. Lazarus & Brian J. McGill | PLOS ONE | 2014-08-27
Modeling indicates that natural long-distance seed dispersal may still be too slow to track rapidly shifting climates, while large-scale human planting could substantially accelerate migration.
56. Survival and Growth Patterns of White Spruce Rangewide Provenances | Lu et al. | Ecology and Evolution | 2014
Data from 245 white spruce provenances show that southern populations can outperform local northern sources, providing empirical support for intraspecific assisted migration.
57. Assisted Migration: What It Means to Nursery Managers and Tree Planters | Williams & Dumroese | Tree Planters' Notes | 2014
This practitioner-oriented article explains how nurseries and reforestation programs could incorporate assisted migration into seed collection, growing, and planting decisions.
58. Douglas-Fir Plantations in Europe: A Retrospective Test of Assisted Migration to Address Climate Change | Miriam G. Isaac-Renton, David R. Roberts & Andreas Hamann | Global Change Biology | 2014
Historical Douglas-fir transfers across Europe provide an unusually large real-world experiment for testing whether populations moved toward matching climates perform better.
59. Preparing for Climate Change: Forestry and Assisted Migration | Williams & Dumroese | Journal of Forestry | 2013
The paper outlines the scientific and operational changes necessary to replace static seed-transfer rules with climate-informed reforestation strategies.
60. Placing Forestry in the Assisted Migration Debate | Pedlar et al. | BioScience | 2012-09-01
This paper distinguishes controversial long-distance conservation introductions from the more incremental movement of common forest-tree populations within or near existing ranges.
61. Whitebark Pine Assisted Migration Potential: Testing Establishment North of the Species Range | McLane & Aitken | Ecological Applications | 2012
Experimental plantings hundreds of kilometers beyond whitebark pine's northern range showed successful germination and early survival at some model-predicted suitable sites.
62. Whitebark Pine Assisted Migration Trial | McLane & Aitken | USDA Forest Service Proceedings | 2011
Experimental planting of whitebark pine beyond its existing northern range helped pioneer field testing of climate models before assisted migration was attempted at operational scales.
63. Assisted Migration: Adapting Forest Management to a Changing Climate | Susan March Leech, Pedro Lara Almuedo & Greg O’Neill | Journal of Ecosystems and Management | 2011
This practitioner-oriented overview explains assisted population migration, range expansion, species movement, seed transfer, uncertainty, and forest-management implications.
64. Assisted Migration to Address Climate Change: Recommendations for Aspen Reforestation in Western Canada | Laura K. Gray, Tim Gylander, Michael S. Mbogga, Pei-Yu Chen & Andreas Hamann | Ecological Applications | 2011
Multiple lines of evidence indicate climatic maladaptation in trembling aspen and support cautious changes to seed movement over relatively short planning horizons.
65. Ecological Impacts and Management Strategies for Western Larch in the Face of Climate Change | Rehfeldt & Jaquish | Mitigation and Adaptation Strategies for Global Change | 2010
Climate niche modeling for western larch demonstrates how projected range shifts and population differences can be translated into forest-management and seed-transfer strategies.
66. Adaptation, Migration or Extirpation: Climate Change Outcomes for Tree Populations | Aitken et al. | Evolutionary Applications | 2008
The authors examine whether long-lived tree populations can adapt, migrate, or survive as climatic conditions move faster than their normal evolutionary and dispersal responses.
67. Use of Response Functions in Selecting Lodgepole Pine Populations for Future Climates | Wang et al. | Global Change Biology | 2006
Provenance-response models demonstrate how forest managers could select lodgepole pine populations suited to projected climates rather than relying strictly on local seed.
68. The Impact of Climate Change on Growth of Local White Spruce Populations in Quebec | Andalo et al. | Forest Ecology and Management | 2005
White spruce growth responses illustrate how populations adapted to historical local climates may become increasingly mismatched as temperatures and moisture regimes change.
Seed Sourcing, Provenance, Genetics, and Assisted Gene Flow
69. COSST: A Tool to Facilitate Seed Provenancing for Climate-Smart Ecosystem Restoration | Mateus C. Silva, Peter Moonlight, Rafael S. Oliveira, Lucy Rowland & R. Toby Pennington | Journal of Applied Ecology | 2025
The COSST tool helps restoration practitioners select seed origins by comparing source climates with current and projected conditions at restoration sites.
70. A Pollen-Based Assisted Migration for Rapid Forest Adaptation | David Chludil et al. | Global Change Biology | 2025
Rather than transporting entire populations, the authors propose using climate-adapted pollen to transfer beneficial genetic material into existing forests and accelerate adaptation.
71. Alleviating the Concerns About Pollen-Based Assisted Migration | David Chludil et al. | Global Change Biology | 2025
The authors respond to concerns about pollen-mediated assisted migration and discuss genetic diversity, breeding, deployment, and practical safeguards.
72. Seed Collection Practices in Tropical Rainforest Restoration and Implications for Provenance Research | Authors | Forest Ecology and Management | 2025
The study examines seed-source practices in tropical restoration and their implications for genetic diversity, provenance selection, and future climate adaptation.
73. Identifying Climatically-Compatible Seedlots for the Eastern US | Adams et al. | Frontiers in Forests and Global Change | 2024-11-20
Researchers develop climate-analogue methods for matching eastern U.S. planting sites with seedlots expected to experience similar climates later this century.
74. Climatic Conditions at Provenance Origin Influence Growth Stability to Changes in Climate | Di Fabio et al. | Frontiers in Forests and Global Change | 2024-07-04
Provenance trials show that historical climate at a seed source can influence growth stability, highlighting the importance of genetic source selection in assisted migration.
75. A Climate Analog Approach to Evaluate Seed Transfer and Vegetation Transitions | Richardson et al. | Frontiers in Forests and Global Change | 2024-04-02
Climate analogues are used to identify seed sources and possible vegetation transitions appropriate for projected future environmental conditions.
76. Weak Local Adaptation to Climate in Seedlings of a Deciduous Conifer Suggests Limited Benefits and Risks of Assisted Gene Flow | Roskilly & Aitken | Evolutionary Applications | 2024
Western larch experiments examine whether climate-driven population differences are strong enough to justify assisted gene flow and how large the benefits or risks may be.
77. An Assessment of Native Seed Needs and the Capacity for Their Supply | National Academies of Sciences, Engineering, and Medicine | National Academies | 2023
This national assessment examines seed sourcing, restoration capacity, climate adaptation, and the challenge of supplying genetically appropriate plant material at landscape scales.
78. Neutral and Adaptive Genetic Diversity in Plants: An Overview | Authors | Frontiers in Ecology and Evolution | 2023
The review explains how adaptive genetic variation can inform assisted migration, assisted gene flow, restoration, and other responses to climate-driven maladaptation.
79. Seed Sourcing in the Genomics Era: Multispecies Provenance Delineation for Current and Future Climates | Walters et al. | Restoration Ecology | 2022
Genomic data can refine seed-transfer zones and reveal how restoration material might be sourced to maintain adaptive diversity under present and future climates.
80. Seed Sourcing Strategies for Ecological Restoration Under Climate Change: A Review of Current Literature | Authors | Frontiers in Conservation Science | 2022
The review compares local sourcing, composite provenancing, predictive provenancing, climate-adjusted provenancing, and other strategies for climate-ready restoration.
81. Cultivating Diversity: The Expert Panel on Plant Health Risks in Canada | Council of Canadian Academies | Council of Canadian Academies | 2022
Canada's plant-health assessment discusses assisted tree migration alongside concerns about pathogens, invasive organisms, genetic diversity, and changing climates.
82. Applying Genomics in Assisted Migration Under Climate Change | Chen et al. | Evolutionary Applications | 2022
The authors develop a framework for using genomic information to identify climate-adapted populations and reduce uncertainty when moving organisms.
83. Seedlot Selection Tool and Climate-Smart Restoration Tool | St. Clair et al. | Ecosphere | 2022
Web-based tools help practitioners compare seed-source climates with current and projected restoration-site climates, providing practical infrastructure for assisted gene flow.
84. Genomic Approaches for Conservation Management in Australia Under Climate Change | Authors | Life | 2021
The review describes how genomic data can improve assisted migration, genetic rescue, provenance selection, and other conservation responses to rapid climate change.
85. Climate-Based Seed Transfer of a Widespread Shrub: Population Shifts, Restoration Strategies, and the Trailing Edge | Bryce A. Richardson & Lindsay Chaney | Ecological Applications | 2018
Big sagebrush experiments show how adaptive traits can be mapped to climate and used to transfer vulnerable warm-edge populations toward future suitable environments.
86. A Climate-Oriented Approach to Support Decision-Making for Seed Provenance in Ecological Restoration | Authors | Frontiers in Ecology and Evolution | 2017
A decision framework links species distributions, projected climates, seed provenance, assisted gene flow, and potential assisted migration in restoration projects.
87. Time to Get Moving: Assisted Gene Flow of Forest Trees | Aitken & Bemmels | Evolutionary Applications | 2016
The authors argue that existing evidence of climate-related genetic differentiation is sufficient to begin cautious assisted gene flow in many temperate forest trees.
88. Climate-Adjusted Provenancing: A Strategy for Climate-Resilient Ecological Restoration | Prober et al. | Frontiers in Ecology and Evolution | 2015-06-23
Climate-adjusted provenancing mixes local seed with material from populations already adapted to environmental conditions expected at restoration sites in the future.
89. Assisted Gene Flow to Facilitate Local Adaptation to Climate Change | Aitken & Whitlock | Annual Review of Ecology, Evolution, and Systematics | 2013
A foundational review explains how deliberately moving genes among populations may increase adaptive capacity while generally posing fewer ecological risks than moving entire species.
90. Potential for Evolutionary Responses to Climate Change — Evidence from Tree Populations | Florian J. Alberto et al. | Global Change Biology | 2013
A broad review of tree genetics evaluates natural adaptive capacity and helps establish when assisted gene flow or assisted migration might become necessary.
91. Assessing the Benefits and Risks of Translocations in Changing Environments: A Genetic Perspective | Andrew R. Weeks et al. | Evolutionary Applications | 2011
The authors evaluate genetic rescue, outbreeding depression, gene flow, and adaptive variation, providing principles applicable to assisted migration and climate adaptation.
92. Building Evolutionary Resilience for Conserving Biodiversity Under Climate Change | Carla M. Sgrò, Andrew J. Lowe & Ary A. Hoffmann | Evolutionary Applications | 2011
Conservation strategies should preserve evolutionary processes and may require genetic mixing, translocation, and other interventions that increase populations' ability to adapt.
93. Seed Supply for Broadscale Restoration: Maximizing Evolutionary Potential | Linda M. Broadhurst et al. | Evolutionary Applications | 2008
Restoration seed systems should retain broad genetic diversity and evolutionary potential rather than relying automatically on narrowly local material, an idea central to later assisted-provenance approaches.
Species Conservation and Climate-Driven Translocations
94. The Desert Is Getting Too Hot for Joshua Trees. Can We Just … Move Them? | Callie Radke Stevens | National Geographic | 2026-02-12
Scientists are testing whether Joshua trees can be established in cooler locations as extreme heat and drought increasingly threaten populations in their historical habitat.
95. To Save Monarch Butterflies, These Scientists Want to Move Mountains | Alexa Robles-Gil | National Geographic | 2024-10-18
Researchers are moving oyamel fir seedlings uphill in Mexico in an attempt to establish the cool forests monarch butterflies may require later this century.
96. Establishing Monarch Butterfly Overwintering Sites for Future Climates | Sáenz-Romero et al. | Frontiers in Forests and Global Change | 2024-09-18
Oyamel fir seedlings were moved upslope near Mexico's Monarch Butterfly Biosphere Reserve to test whether future high-elevation forests could provide monarch overwintering habitat.
97. Impacts of Assisted Migration: An Introduced Herbivore Has Short- and Long-Term Effects on Its Native Host Plant Population | Ravikanthachari et al. | Entomologia Experimentalis et Applicata | 2024
A butterfly introduced decades earlier provides a rare opportunity to study how assisted relocation can alter ecological interactions within recipient communities.
98. With Hotter, Drier Weather, California’s Joshua Trees Are in Trouble | Authors | Yale Environment 360 | 2024
Joshua tree decline illustrates the dilemma facing species whose future climate habitat may emerge beyond areas they can naturally colonize rapidly enough.
99. Incorporating Assisted-Migrant Mammal Populations into Conservation Policy | Authors | Conservation Biology | 2024
An analysis of mammals established outside their native ranges asks whether threatened species should receive conservation value when human-assisted populations provide insurance against extinction.
100. How Should We Help Wild Animals Cope with Climate Change? The Case of the Iberian Lynx | Authors | Animals | 2023
Using the Iberian lynx as a case study, the article evaluates assisted migration against other interventions such as habitat management, supplemental resources, and captivity.
101. These Animals Are Racing Towards Extinction. A New Home Might Be Their Last Chance | Clare Watson | Nature | 2023
The feature examines growing scientific interest in assisted colonization for animals whose existing habitats are disappearing too quickly for natural migration.
102. How to Move a Cat | Tegan Armarego-Marriott | Nature Climate Change | 2023
This research highlight discusses how conservationists might identify suitable destinations and timing for climate-driven translocation of vulnerable animal species.
103. Empirical Estimation of Habitat Suitability for Rare Plant Restoration in an Era of Ongoing Climatic Shifts | Authors | Scientific Reports | 2023
Field-based habitat evaluation provides a way to identify restoration and possible translocation sites for rare plants whose climatic niches are shifting.
104. Climate Change and Collapsing Thermal Niches of Desert Reptiles and Amphibians: Assisted Migration and Acclimation Rescue from Extirpation | Authors | Science of the Total Environment | 2023
The study examines whether translocation and acclimation could prevent local losses of desert ectotherms as extreme heat erodes their available thermal habitat.
105. Exploring the Potential for Plant Translocations to Adapt to a Warming World | Sarah E. Dalrymple | Journal of Ecology | 2021
This synthesis considers how experience from plant reintroductions and restoration can inform increasingly climate-oriented translocation programs.
106. Community-Level Assisted Migration for Climate-Appropriate Prairie Restoration | Mark J. McKone & Diana L. Hernandez | Restoration Ecology | 2021
The authors propose extending assisted migration from single populations to entire prairie communities by incorporating species and seed sources suited to future climates.
107. Climate Change and the Suitability of Local and Non-Local Species for Ecosystem Restoration | Peter A. Harrison | Ecological Management & Restoration | 2021
The article questions rigid reliance on local species and local provenance when restoration sites are moving toward climatic conditions without historical equivalents.
108. Preparing Wildlife for Climate Change: How Far Have We Come? | Authors | U.S. Geological Survey | 2020-10-30
A review of more than a thousand wildlife studies finds assisted migration among a growing range of proposed management responses to climate change.
109. Importance of Species Translocations Under Rapid Climate Change | Authors | Conservation Science and Practice | 2020
The authors argue that conservation translocations deserve greater practical attention and recommend small-scale trials, careful candidate selection, monitoring, and public engagement.
110. A Multidisciplinary Approach to Inform Assisted Migration of the Restricted Rainforest Tree Fontainea rostrata | Conroy et al. | PLOS ONE | 2019-01-25
Genetics, habitat distribution, and population structure are combined to evaluate translocation options for a threatened Australian rainforest tree.
111. Ecological Restoration of Abies religiosa Forests Using Nurse Plants and Assisted Migration in the Monarch Butterfly Biosphere Reserve | Carbajal-Navarro et al. | Frontiers in Ecology and Evolution | 2019
Researchers test nurse plants and upslope relocation to improve establishment of oyamel fir forests that provide monarch butterfly overwintering habitat.
112. Experimental Test of Assisted Migration for Conservation of Locally Range-Restricted Plants in Alberta | Authors | Global Ecology and Conservation | 2019
Translocation trials involving two rare prairie plants show that survival can be highly site-specific and that assisted migration requires species-by-species experimentation.
113. The Active Reef Restoration Toolbox Is a Vehicle for Coral Resilience and Adaptation in a Changing World | Authors | Journal of Marine Science and Engineering | 2019
The review includes assisted migration and colonization among possible coral-restoration strategies as reef species shift poleward in response to warming seas.
114. A Framework for Prioritizing Conservation Translocations to Mimic Natural Ecological Processes Under Climate Change: A Case Study with African Antelopes | Authors | Biological Conservation | 2016
African antelope models distinguish different types of climate-driven translocation based on dispersal barriers and the accessibility of emerging suitable habitat.
115. Assisted Migration as a Climate Change Adaptation Strategy: Lessons from Restoration and Plant Reintroductions | Authors | Israel Journal of Plant Sciences | 2016
Restoration and rare-plant reintroduction experience is used to evaluate likely successes, failures, and ecological risks of assisted migration.
116. Constraints to and Conservation Implications for Climate Change Adaptation in Plants | Authors | Conservation Genetics | 2016
The review discusses assisted migration and assisted gene flow as responses when adaptation and natural dispersal cannot keep pace with climatic change.
117. Using Assisted Colonisation to Conserve Biodiversity and Restore Ecosystem Function | Authors | Biological Conservation | 2013
The authors broaden the rationale for assisted colonization from saving individual species to restoring ecological functions that might otherwise disappear under climate change.
118. Considering Extinction of Dependent Species During Translocation, Ex Situ Conservation, and Assisted Migration of Threatened Hosts | Melinda L. Moir et al. | Conservation Biology | 2012
Conservation programs moving a threatened host species may inadvertently abandon specialized parasites, mutualists, or other dependent organisms unless ecological relationships are considered.
119. Assisted Colonization: A Question of Focal Units and Recipient Localities | Kreyling et al. | Restoration Ecology | 2011
Rather than focusing only on rare species, the authors consider moving climate-adapted foundation or keystone populations capable of maintaining habitat for many dependent organisms.
120. Challenges and Opportunities in Implementing Managed Relocation for Conservation of Freshwater Species | Olden et al. | Conservation Biology | 2011
Freshwater species may be especially vulnerable to climate-driven isolation, but moving them among watersheds also presents unusually serious invasion risks.
121. Assisted Colonization: Integrating Conservation Strategies in the Face of Climate Change | Authors | Biological Conservation | 2011
The authors argue that assisted colonization should be integrated with habitat connectivity and conservation genetics rather than treated as a stand-alone response.
122. From Reintroduction to Assisted Colonization: Moving Along the Conservation Translocation Spectrum | Philip J. Seddon | Restoration Ecology | 2010
This article clarifies terminology across the spectrum from reintroductions inside historical ranges to assisted colonization beyond those ranges.
123. Assisted Migration of Plants: Changes in Latitudes, Changes in Attitudes | Vitt et al. | Biological Conservation | 2010
A major plant-focused review discusses extinction risk, migration barriers, seed banking, experimental translocation, and changing attitudes toward deliberate species movement.
124. Climate Change and Translocations: The Potential to Re-establish Two Regionally-Extinct Butterfly Species in Britain | Authors | Biological Conservation | 2009
Climate and habitat models were used to evaluate whether butterfly species lost from Britain could successfully establish again as warming creates increasingly suitable conditions.
125. Assisted Colonization and Rapid Climate Change | Hoegh-Guldberg et al. | Science | 2008
This influential paper argues that conservationists may have to consider moving species outside historical ranges when rapid climate change and fragmented landscapes prevent natural migration.
Restoration, Ecosystem Function, and Climate Adaptation
126. International Principles and Standards for the Practice of Ecological Restoration — Third Edition | Gann et al. | Restoration Ecology | 2026
The updated international restoration standards discuss climate-ready seed sourcing and approaches such as predictive and climate-adjusted provenancing, placing assisted movement within broader restoration planning.
127. The Zebra in Your Back Yard! Are Urban Gardens and Parks the “Stepping Stones” for Novel, Climate-Adapted Ecosystems? | Authors | Sustainability | 2026
This perspective considers whether urban parks and gardens could serve as experimental stepping stones for species moved poleward as climates become unsuitable within their existing ranges.
128. Revisiting the Case for Assisted Colonisation Under Rapid Climate Change | Gardner et al. | Journal of Applied Ecology | 2025-03-26
The authors argue that assisted colonisation may eventually be needed at ecosystem scale, particularly where geographic barriers prevent communities from naturally reorganizing as climates shift.
129. The Application of Assisted Migration as a Climate Change Adaptation Tactic: An Evidence Map and Synthesis | Authors | Biological Conservation | 2023-04
A global evidence synthesis finds that conservation-driven assisted migration remains rare and that most empirical evidence involves plants, particularly trees.
130. Facilitated Adaptation as a Conservation Tool in the Present Climate Change Context | Authors | Plants | 2023
This methodological review compares assisted migration with genetic and evolutionary approaches intended to accelerate species adaptation to environmental change.
131. Climate Change 2022: Terrestrial and Freshwater Ecosystems and Their Services | IPCC | Sixth Assessment Report, Working Group II | 2022
The IPCC reviews observed species range shifts and adaptation options including translocations and assisted migration where natural movement cannot keep pace with warming.
132. Canada in a Changing Climate: Ecosystem Services | Natural Resources Canada | National Issues Report | 2021
Canada's national climate assessment discusses assisted migration as an emerging option for maintaining forest health, biodiversity, and ecosystem services.
133. International Principles and Standards for the Practice of Ecological Restoration — Second Edition | Gann et al. | Restoration Ecology | 2019
International restoration standards recognize that ecological restoration increasingly must accommodate environmental change rather than automatically reproduce historical species compositions.
134. Classical Ecological Restoration and Its Current Challenges: Assisted Migration as an Adaptation Strategy to Climate Change | Pilar A. Gómez-Ruiz & Roberto Lindig-Cisneros | Revista de Ciencias Ambientales | 2017
This review connects assisted migration with changing restoration philosophy and considers when historical reference ecosystems may no longer be realistic targets.
135. Prestoration: Using Species in Restoration That Will Persist Now and Into the Future | Butterfield et al. | Restoration Ecology | 2017
“Prestoration” proposes establishing species that can function at restoration sites today while remaining suited to projected future climates.
136. Quantifying the Need and Potential of Assisted Migration | Maria Hällfors et al. | Biological Conservation | 2017
The authors develop an Assisted Migration Index that compares projected losses of current habitat with gains of newly suitable habitat.
137. Assessing the Need and Potential of Assisted Migration Using Species Distribution Models | Maria H. Hällfors et al. | Biological Conservation | 2016
Species-distribution models are converted into measures of migration need and opportunity, illustrating how relocation priorities vary with climate scenarios and modeling assumptions.
138. Coming to Terms with the Concept of Moving Species Threatened by Climate Change | Hällfors et al. | PLOS ONE | 2014
A systematic review identifies dozens of competing terms and definitions and proposes a clearer definition of assisted migration for conservation under climate change.
139. Growing Assisted Migration: Synthesis of a Climate Change Adaptation Strategy | Williams & Dumroese | USDA Forest Service | 2013
This synthesis reviews implementation guidelines, decision frameworks, and practical resources for nurseries, landowners, researchers, and restoration practitioners.
140. An Overview of Concepts, Potentials, Issues, and Realities of Assisted Migration | Iverson et al. | USDA Forest Service | 2013
Forest managers are presented with a continuum from non-intervention and connectivity enhancement to active conversion of landscapes through assisted migration.
141. Guidelines for Reintroductions and Other Conservation Translocations | IUCN Species Survival Commission | IUCN | 2013
These influential guidelines establish principles for reinforcement, reintroduction, ecological replacement, and assisted colonization, including risk assessment and monitoring.
142. Habitat Restoration and Climate Change: Dealing with Climate Variability, Incomplete Data, and Management Decisions with Tree Translocations | Marta Benito-Garzón, Minh Ha-Duong, Nathalie Frascaria-Lacoste & Juan Fernández-Manjarrés | Restoration Ecology | 2013
The article develops a decision perspective for tree translocations in which managers must account for incomplete climate predictions and continually revise actions through monitoring.
143. Intervention Ecology: Applying Ecological Science in the Twenty-First Century | Richard J. Hobbs, Lauren M. Hallett, Paul R. Ehrlich & Harold A. Mooney | BioScience | 2011
Intervention ecology provides a broader intellectual framework for controversial actions such as assisted migration when passive conservation can no longer maintain ecological values.
144. Translocation of Species, Climate Change, and the End of Trying to Recreate Past Ecological Communities | Chris D. Thomas | Trends in Ecology & Evolution | 2011
The author argues that conservation increasingly must manage ecological change rather than assume historical communities can remain fixed under rapidly shifting climates.
145. Ecological Connectivity for a Changing Climate | Joshua J. Lawler et al. | Conservation Biology | 2010
Connectivity is presented as a first-line strategy for facilitating natural range shifts, while species unable to use corridors may ultimately require direct human-assisted movement.
146. Regional Climate Change Adaptation Strategies for Biodiversity Conservation in a Midcontinental Region of North America | Susan M. Galatowitsch, Lee E. Frelich & Laura Phillips-Mao | Biological Conservation | 2009
The authors compare adaptation strategies including refugia, connectivity, restoration, and facilitated movement for species responding to projected Midwestern climate change.
147. Biodiversity Management in the Face of Climate Change: A Review of 22 Years of Recommendations | Nicole E. Heller & Erika S. Zavaleta | Biological Conservation | 2009
A comprehensive review traces the shift from traditional reserve management toward dynamic strategies that include connectivity, adaptive management, and assisted migration.
148. The Greenhouse Effect and Nature Reserves: Global Warming Would Diminish Biological Diversity by Causing Extinctions Among Reserve Species | Robert L. Peters & Joan D.S. Darling | BioScience | 1985
This foundational paper recognized decades before the modern assisted-migration debate that fixed reserves could fail when climate zones move and suggested that conservation would have to accommodate species redistribution.
Policy, Law, Governance, and Social Acceptance
149. Climate Law’s Contribution to Biodiversity Conservation: The Case of Assisted Species Migration | Maksim Lavrik | Journal of International Wildlife Law & Policy | 2026-04-15
The article examines how the Paris Agreement, national adaptation plans, and other climate-law mechanisms could help establish international norms for assisted migration.
150. Exploring Forest Futures: Ethics and Governance of Assisted Migration as a Climate Adaptation Strategy | Felipe J. Tavares Moreira et al. | Ecology and Society | 2026
This synthesis examines assisted migration through environmental ethics, governance, public acceptance, institutional authority, trust, and the inclusion of different knowledge systems.
151. Public Perception of Forest Assisted Migration | Moreira et al. | Frontiers in Forests and Global Change | 2024-08-29
Quebec stakeholders generally viewed forest assisted migration as potentially useful but emphasized caution, experimentation, monitoring, and transparent decision-making.
152. The Role of Biodiversity-Related Conventions in Developing Regulation of Assisted Species Migration | Maksim Lavrik | Chinese Journal of Environmental Law | 2024
The article explores how international biodiversity treaties could accommodate, guide, and regulate assisted migration while minimizing ecological risks.
153. A Policy Scan Related to Assisted Migration as a Climate Change Adaptation Tactic in Canada Reveals Major Policy Gaps | Cooke et al. | FACETS | 2024
A review of Canadian policies finds that regulatory frameworks frequently fail to provide clear guidance for conservationists considering climate-driven species relocation.
154. Difficult Climate-Adaptive Decisions in Forests as Complex Social-Ecological Systems | Kieran Findlater, Robert Kozak & Shannon Hagerman | Proceedings of the National Academy of Sciences | 2022
The authors show why forest adaptation decisions such as assisted migration cannot be resolved solely through biophysical science because values, institutions, and uncertainty also shape choices.
155. Current Conservation Regimes and the Road to Laws on Assisted Migration | Maksim Lavrik | Environmental Management | 2022
Legal systems in the United States, Australia, and Europe are compared to determine whether existing conservation laws adequately accommodate climate-driven translocations.
156. Customary Norms, General Principles of International Environmental Law, and Assisted Migration | Maksim Lavrik | Environmental Law Review / Springer | 2022
This legal analysis examines whether international environmental principles support or constrain moving species beyond historical ranges to avoid climate-driven extinction.
157. Perceived Barriers to the Use of Assisted Colonization for Climate-Sensitive Species in the Hawaiian Islands | Authors | Environmental Management | 2021-06-23
Hawaiian conservation practitioners identify scientific, regulatory, institutional, and social barriers that help explain why assisted colonization remains uncommon.
158. Whose Expertise Counts? Assisted Migration and the Politics of Knowledge in British Columbia’s Public Forests | Ricardo Pelai, Shannon M. Hagerman & Robert Kozak | Land Use Policy | 2021
Interviews reveal that assisted-migration policy has relied heavily on biophysical modeling while Indigenous, local, and practitioner knowledge have received comparatively little influence.
159. Disentangling the Social Complexities of Assisted Migration Through Deliberative Methods | Hagerman, Kozak & Dalrymple | Journal of Ecology | 2021
The study examines how values, uncertainty, stakeholder perspectives, and competing conservation goals shape public and professional attitudes toward assisted migration.
160. Public Trust and Knowledge in the Context of Emerging Climate-Adaptive Forestry Policies | Guillaume Peterson St-Laurent et al. | Journal of Environmental Management | 2019
Public acceptance of novel forestry interventions depends strongly on institutional trust, knowledge, risk perception, and how climate-adaptation policies are communicated.
161. Conservation Introductions for Biodiversity Adaptation Under Climate Change | Authors | Transnational Environmental Law | 2018
Australian conservation law is used to expose international, national, and state-level legal barriers to deliberate introductions beyond historical species ranges.
162. What Risks Matter? Public Views About Assisted Migration and Other Climate-Adaptive Reforestation Strategies | Guillaume Peterson St-Laurent, Shannon Hagerman & Robert Kozak | Climatic Change | 2018
Public attitudes toward assisted migration depend not merely on ecological risk but on trust, management goals, perceived benefits, and the type of intervention proposed.
163. One Option, Two Countries, Several Strategies: Subjacent Mechanisms of Assisted Migration Implementation in Canada and France | Roxane Sansilvestri, Nathalie Frascaria-Lacoste & Juan Fernández-Manjarrés | Restoration Ecology | 2016
Comparing Canada and France shows how forest culture, institutional structures, scientific communication, and perceptions of climate impacts influence assisted-migration policy.
164. The Development of Assisted Migration Policy in Canada: An Analysis of the Politics of Composing Future Forests | Nicole L. Klenk | Land Use Policy | 2015
The emergence of western larch assisted migration in British Columbia illustrates how economic interests, climate science, forest crises, and political framing produce policy change.
165. The Assisted Migration of Western Larch in British Columbia: A Signal of Institutional Change in Forestry in Canada? | Nicole L. Klenk & Brendon M.H. Larson | Global Environmental Change | 2015
Western larch policy is examined as evidence that forestry institutions are moving away from static historical-reference assumptions toward climate-oriented genetic management.
166. Scientists, Managers, and Assisted Colonization: Four Contrasting Perspectives Entangle Science and Policy | Mark W. Neff & Brendon M.H. Larson | Biological Conservation | 2014
Scientists and resource managers fall into several distinct camps whose disagreements arise as much from values and policy preferences as from ecological evidence.
167. Assisted Colonization Under the U.S. Endangered Species Act | Patrick D. Shirey | Conservation Letters | 2010
The article analyzes whether U.S. endangered-species law provides authority to establish threatened species outside their known historical ranges.
168. Assisted Migration: Redefining Nature and Natural Resource Law Under Climate Change | Alejandro E. Camacho | Yale Journal on Regulation | 2010
The article argues that existing natural-resource law is poorly designed for species whose suitable habitats move across static jurisdictional and conservation boundaries.
Risk, Ethics, Decision Frameworks, and Debate
169. Managed Relocation | National Park Service | U.S. National Park Service | 2024
The National Park Service summarizes managed relocation and provides risk-assessment resources for agencies considering climate-driven translocations.
170. Quantifying the Capacity for Assisted Migration to Achieve Conservation and Forestry Goals Under Climate Change | Yibiao Zou, Gregory A. Backus, Hugh D. Safford, Sarah Sawyer & Marissa L. Baskett | Journal of Biogeography | 2024
Modeling evaluates when assisted migration can realistically help populations track shifting climates while meeting conservation or forestry objectives.
171. Managed Relocation as a Climate Change Adaptation Strategy | National Park Service | Climate Change Response Program Newsletter | 2021-04
This agency overview introduces managed relocation and the decision frameworks being developed for climate-threatened resources in national parks.
172. Ecological Risk Assessment of Managed Relocation as a Climate Change Adaptation Strategy | Karasov-Olson et al. | National Park Service | 2021-03
This detailed framework helps managers compare the extinction risk of inaction with possible harms to recipient ecosystems before undertaking managed relocation.
173. Identifying Robust Strategies for Assisted Migration in a Competitive Stochastic Metacommunity | Gregory A. Backus & Marissa L. Baskett | Conservation Biology | 2021
Models show how ecological competition, environmental uncertainty, establishment failure, and climate trajectories affect the success of assisted migration.
174. Risks and Opportunities of Assisted Colonization: The Perspectives of Experts | Authors | Nature Conservation | 2021
Conservation experts identify potential benefits of assisted colonization but emphasize establishment failure, disease transfer, invasion risk, carrying capacity, and adaptive monitoring.
175. When Might Managed Relocations of At-Risk Species Be Warranted? | National Park Service | U.S. National Park Service | 2021
The National Park Service explains how managers can systematically compare extinction risks from inaction with ecological risks created by relocation.
176. Information Underload: Ecological Complexity, Incomplete Knowledge, and Data Deficits Create Challenges for Assisted Migration | Park & Talbot | BioScience | 2018
The authors warn that incomplete ecological information can make confident predictions about future tree performance and recipient ecosystems extremely difficult.
177. Assisted Migration Within Species Range Ignores Biotic Interactions and Lacks Evidence | Anna Bucharova | Restoration Ecology | 2017
This critique warns that transferring supposedly climate-adapted plant ecotypes can disrupt relationships with pollinators, herbivores, pathogens, and other members of ecological communities.
178. Should We Move the Whitebark Pine? Assisted Migration, Ethics and Global Environmental Change | Clare Palmer & Brendon M.H. Larson | Environmental Values | 2014
The whitebark pine case exposes conflicts among preventing extinction, protecting ecological integrity, respecting wildness, and accepting human responsibility for climate-driven losses.
179. How to Decide Whether to Move Species Threatened by Climate Change | Rout et al. | PLOS ONE | 2013
A quantitative decision framework helps conservationists compare translocation options while explicitly accounting for uncertainty, benefits, costs, and ecological risks.
180. A Rhetorical Analysis of the Scientific Debate Over Assisted Colonization | Nicole L. Klenk & Brendon M.H. Larson | Environmental Science & Policy | 2013
The authors examine how language, metaphors, and competing conceptions of nature shape scientific arguments for and against assisted colonization.
181. Managed Relocation: Integrating the Scientific, Regulatory, and Ethical Challenges | Schwartz et al. | BioScience | 2012
A large interdisciplinary team examines the ecological science, legal structures, social values, and ethical tradeoffs involved in deliberately relocating species.
182. Taking Stock of the Assisted Migration Debate | Nina Hewitt et al. | Biological Conservation | 2011
This major literature review finds substantial support as well as intensifying opposition and concludes that many disagreements ultimately reflect differing values rather than resolvable scientific facts.
183. Why We Disagree About Assisted Migration: Ethical Implications of a Key Debate Regarding the Future of Canada’s Forests | Isabelle Aubin et al. | The Forestry Chronicle | 2011
Canadian researchers distinguish different objectives and scales of assisted migration and trace disagreement to ethical assumptions about nature, intervention, risk, and responsibility.
184. Optimal Timing for Managed Relocation of Species Faced with Climate Change | Eve McDonald-Madden, Michael C. Runge, Hugh P. Possingham & Tara G. Martin | Nature Climate Change | 2011
A decision model addresses a critical practical question: whether managers should relocate a declining species immediately or wait until destination habitat becomes sufficiently suitable.
185. Move It or Lose It? The Ecological Ethics of Relocating Species Under Climate Change | Minteer & Collins | Ecological Applications | 2010-10-01
The authors examine the ethical conflict between intervening to prevent climate-driven extinction and protecting recipient ecosystems from uncertain consequences.
186. Expert Views on Biodiversity Conservation in an Era of Climate Change | Shannon Hagerman et al. | Global Environmental Change | 2010
Conservation experts describe how climate change challenges conventional ideas about native species, historical baselines, ecosystem integrity, and active intervention.
187. The Value of Species and the Ethical Foundations of Assisted Colonization | Ronald Sandler | Conservation Biology | 2010
This philosophical analysis asks what values justify moving a threatened species and whether intervention can be morally preferable to allowing climate-driven extinction.
188. Multidimensional Evaluation of Managed Relocation | Richardson et al. | Proceedings of the National Academy of Sciences | 2009-06-09
The authors propose evaluating candidate relocations across multiple ecological, social, economic, and management dimensions rather than relying on a simple move-or-don't-move choice.
189. Alien Species in a Warmer World: Risks and Opportunities | Gian-Reto Walther et al. | Trends in Ecology & Evolution | 2009
Climate change complicates the distinction between native range shifts and biological invasions, a central issue when evaluating ecological risks of assisted migration.
190. Assisted Migration: Part of an Integrated Conservation Strategy | Vitt, Havens & Hoegh-Guldberg | Trends in Ecology & Evolution | 2009
This response argues that assisted migration should be considered as one element of a broader conservation strategy rather than rejected categorically.
191. Managed Relocation: A Nuanced Evaluation Is Needed | Sax & Smith | Trends in Ecology & Evolution | 2009
The authors reject blanket judgments about assisted relocation and argue that risk and benefit must instead be evaluated on a species- and site-specific basis.
192. Assisted Colonization Is Not a Viable Conservation Strategy | Ricciardi & Simberloff | Trends in Ecology & Evolution | 2009
One of the strongest critiques warns that introduced organisms can produce unpredictable and irreversible ecological effects that conventional risk assessment may fail to anticipate.
193. Managed Relocation of Species: Noah's Ark or Pandora's Box? | Safford et al. | Eos, Transactions American Geophysical Union | 2009
This report summarizes early scientific debate over whether assisted migration represents a necessary conservation response or an ecological risk comparable to intentional species introduction.
194. Assisted Colonization Is a Techno-Fix | Iain Fazey & Joern Fischer | Trends in Ecology & Evolution | 2009
This critique argues that assisted colonization may distract attention from deeper causes of biodiversity decline and broader ecosystem-based responses to climate change.
195. The Precautionary Principle in Managed Relocation Is Misguided Advice | Mark W. Schwartz, Jessica J. Hellmann & Jason S. McLachlan | Trends in Ecology & Evolution | 2009
The authors argue that precaution must account for both sides of the decision because refusing to relocate a species can itself produce irreversible extinction.
196. Assisted Colonization: Evaluating Contrasting Management Actions (and Values) in the Face of Uncertainty | Martin A. Schlaepfer, William D. Helenbrook, Kevin B. Searing & Kevin T. Shoemaker | Trends in Ecology & Evolution | 2009
The paper argues that decisions should compare the uncertain consequences of intervention with those of non-intervention rather than treating inaction as risk-free.
197. Moving on Assisted Migration | Emma Marris | Nature Reports Climate Change | 2008-08-28
This news feature captures the period when deliberately relocating climate-threatened species moved from conservation taboo toward serious scientific discussion.
198. An Assessment of Invasion Risk from Assisted Migration | Mueller & Hellmann | Conservation Biology | 2008
Analysis of intracontinental invasive species suggests that assisted migration may only rarely create invasions, but any species that does become invasive could cause serious ecological harm.
199. A Framework for Debate of Assisted Migration in an Era of Climate Change | McLachlan, Hellmann & Schwartz | Conservation Biology | 2007-04
One of the foundational assisted-migration papers proposes a framework for evaluating the risks of extinction, intervention, invasion, and uncertainty rather than treating relocation as categorically acceptable or unacceptable.
200. Climate Change and Moving Species: Furthering the Debate on Assisted Colonization | Malcolm L. Hunter Jr. | Conservation Biology | 2007
An early contribution argues that deliberate translocation deserves consideration when climate change prevents vulnerable species from reaching newly suitable habitat naturally.
