Extinction Rates
Extinction Rates
Extinction is a natural part of evolution. Species originate, expand, decline, and eventually disappear, and the fossil record demonstrates that this process has continued throughout the history of life. What distinguishes the modern biodiversity crisis is not the existence of extinction itself but the apparent speed at which species are being lost and the growing role of human activity in driving those losses.
Scientists measure extinction in several ways. Some studies count species known to have disappeared. Others estimate extinction rates from fossil records, changes in geographic ranges, population trends, or movements between categories on the IUCN Red List. Still others attempt to estimate species that may have vanished without ever being scientifically described. These different approaches can produce substantially different numerical estimates.
Despite these uncertainties, the research surveyed here points in the same general direction: contemporary extinction is occurring much faster than the long-term rates inferred from the fossil record. Habitat destruction, exploitation, invasive species, pollution, disease, and climate change are interacting with the biological characteristics of vulnerable species to increase extinction risk across terrestrial, freshwater, and marine ecosystems.
Background Extinction Rates
A central question in extinction research is how rapidly species would disappear in the absence of extraordinary environmental disruption. This long-term natural turnover is usually described as the background extinction rate.
Background rates are reconstructed primarily from fossils and evolutionary relationships. Estimates vary because the fossil record is incomplete, preservation differs greatly among environments and organisms, and species can be difficult to define consistently across geological time.
Some modern estimates place the natural background rate near a fraction of one extinction per million species per year, although higher estimates have also been used. The precise value remains debated.
This uncertainty is important because estimates of how much modern extinction exceeds the natural rate depend directly on the baseline chosen. Nevertheless, studies using both relatively low and comparatively generous background rates generally conclude that recent human-associated extinction is substantially elevated.
Some analyses have estimated modern extinction rates at tens or hundreds of times natural background levels, while other influential studies have produced estimates approaching roughly 1,000 times background. These figures should not be interpreted as a single universally accepted global rate. They instead illustrate the magnitude of the difference between ordinary evolutionary turnover and the rapid species losses observed during the modern era.
The Fossil Record and Mass Extinction
The fossil record provides the principal long-term benchmark for understanding extinction. Over hundreds of millions of years, extinction rates have fluctuated considerably. Most species disappeared during periods of relatively ordinary background turnover, but Earth has also experienced intervals of extraordinary biodiversity loss.
The largest of these events are recognized as mass extinctions. During such episodes, unusually large proportions of species disappeared over geologically short periods of time. Fossil studies allow researchers to distinguish these episodes from normal background extinction and to examine how ecosystems subsequently recovered.
Comparing the present with ancient mass extinctions is difficult. Fossil extinction rates are usually measured across thousands or millions of years, while modern biological observations often span only decades or centuries. Fossil preservation is also strongly biased toward organisms with hard body parts and toward environments where sediments accumulate.
For this reason, statements that Earth is experiencing a "sixth mass extinction" generally refer to the unusually rapid trajectory of current losses rather than a claim that the planet has already lost a percentage of species equal to the largest prehistoric mass extinctions.
Modern extinction rates can therefore be extraordinarily high even if the total proportion of species lost so far remains below the thresholds associated with the great geological mass extinctions.
Current Global Extinction Risk
The IUCN Red List has become one of the most important systems for tracking the conservation status of species. Rather than merely counting species already declared extinct, Red List assessments evaluate population size, population decline, geographic range, fragmentation, and other indicators of extinction risk.
Current assessments indicate that tens of thousands of evaluated species face a significant risk of extinction. United Nations biodiversity indicators likewise show continuing deterioration in the overall status of species.
The Red List Index is particularly useful because it attempts to distinguish genuine changes in extinction risk from changes caused simply by scientists assessing additional species. Declining index values indicate that, collectively, assessed species are moving closer to extinction.
Even these assessments remain incomplete. Mammals and birds are comparatively well studied, while enormous numbers of insects, fungi, plants, marine organisms, and other invertebrates have either never been formally evaluated or remain poorly known.
Recorded extinctions therefore represent only part of the biodiversity crisis. Some species may disappear before they are described, while others may survive in such small numbers or isolated populations that their disappearance is not confirmed for decades.
Extinction Rates Across Different Groups
Extinction risk is not distributed evenly across the tree of life.
Amphibians have experienced particularly severe declines. Habitat destruction, climate change, pollution, and infectious disease have combined to threaten populations around the world. Chytrid fungal disease has contributed to dramatic amphibian declines and suspected extinctions, making wildlife disease an important component of modern biodiversity loss.
Freshwater ecosystems also contain exceptionally high concentrations of threatened species. Fishes, mollusks, crustaceans, dragonflies, and other freshwater organisms are exposed to habitat alteration, dams, water extraction, pollution, invasive species, and changes in river flow.
Plants are frequently underrepresented in discussions of extinction, yet global studies have documented hundreds of modern plant extinctions. Many additional plants are considered possibly extinct or remain insufficiently surveyed. Rare plants and trees can be especially vulnerable when they have small ranges or specialized habitat requirements.
Marine species were once sometimes assumed to be comparatively resistant to extinction because oceans are large and many marine organisms have broad distributions. Research on sharks, rays, corals, fishes, and other marine groups has challenged this assumption. Overfishing, warming, ocean acidification, habitat degradation, and other pressures can produce severe population declines even in widely distributed species.
Birds and mammals provide some of the best historical extinction records. Their losses demonstrate the particularly severe effects that human colonization, hunting, habitat conversion, and introduced predators have had on island species.
Insects and other invertebrates remain among the greatest sources of uncertainty. Because they account for an enormous portion of animal diversity but are poorly monitored in many regions, their true contribution to modern extinction may be substantially underestimated.
Human Drivers of Extinction
Modern extinction rarely has a single cause. Species are often exposed simultaneously to several pressures that reinforce one another.
Habitat loss and land-use change are among the most pervasive drivers. Forest clearing, agricultural expansion, urban development, infrastructure, wetland destruction, and alteration of rivers can shrink and fragment populations until they become too small to remain viable.
Direct exploitation is another major driver. Hunting, fishing, collection, and wildlife trade have contributed to the decline or disappearance of numerous species. Sharks and rays provide a particularly prominent marine example of extinction risk associated with intense exploitation.
Invasive species have played an especially important role on islands. Introduced mammals such as rats, cats, and other predators can devastate animals that evolved in environments without comparable predators. Invasive species may also compete with native organisms, modify habitats, spread disease, or disrupt ecological relationships.
Climate change is becoming increasingly important. Rising temperatures can shift suitable habitats, alter rainfall and water availability, increase extreme events, and force species to move toward cooler areas. When species cannot migrate, adapt, or tolerate new conditions, populations can disappear from parts of their ranges.
Climate-driven local extinctions are already being documented. Modeling studies further suggest that extinction risk rises as warming increases, making the magnitude of future climate change an important determinant of future biodiversity loss.
Pollution, pesticides, disease, hydrological alteration, and other pressures add additional layers of risk. Their effects often interact with habitat loss and climate change rather than operating independently.
Extinction Debt and Delayed Loss
One of the most important concepts in modern conservation biology is extinction debt.
Species do not necessarily disappear immediately after their habitat is destroyed or fragmented. Small populations may survive for years, decades, or even centuries after environmental conditions have deteriorated beyond the point required for long-term persistence.
This creates a delay between environmental damage and its full biological consequences.
A forest fragment, grassland remnant, or isolated wetland may therefore continue to contain species that are effectively committed to eventual disappearance unless conditions improve. Present-day species counts can consequently underestimate the long-term impact of habitat destruction.
Extinction debt also complicates attempts to calculate modern extinction rates. Short monitoring periods may record relatively few complete extinctions even while large numbers of populations are declining toward future disappearance.
Delayed effects can occur at the genetic level as well. Populations that have recently declined may retain substantial genetic diversity for a period of time, masking genetic erosion that becomes apparent only generations later.
Recognizing extinction debt changes the interpretation of conservation. Preventing habitat destruction is not sufficient by itself; restoring habitat, reconnecting isolated populations, and increasing population sizes may also be necessary to prevent extinctions already set in motion.
Coextinction and Ecological Cascades
Species exist within ecological networks rather than independently. The disappearance of one species can therefore increase the probability that others will disappear.
This process is known as coextinction or secondary extinction.
A parasite may depend entirely on a single host. A specialized pollinator may depend on one plant, while that plant may depend on the pollinator. Predators may depend on particular prey, and organisms may depend on other species for shelter, seed dispersal, food, or reproduction.
If the primary species disappears, dependent species can disappear with it.
Ecological-network studies suggest that such cascading effects could substantially increase the consequences of biodiversity loss. The extinction of highly connected or functionally important species may be especially disruptive.
Ecological redundancy can sometimes buffer ecosystems. If several species perform similar functions or provide alternative resources, the disappearance of one species may be partially compensated for by others. In highly specialized systems, however, such substitutes may not exist.
The possibility of coextinction means that simply counting individually documented species losses may underestimate the eventual biological consequences of the extinction crisis.
Measuring Extinction Is Difficult
Determining whether a species is extinct is surprisingly difficult.
Failure to observe a species does not prove that the last individual has died. Rare organisms may go unseen for years, particularly when they inhabit remote regions, deep oceans, dense forests, caves, or poorly surveyed freshwater systems.
Scientists therefore face two opposite risks. Declaring extinction too early may cause conservation efforts to stop while surviving individuals remain. Waiting too long can make extinction statistics underestimate the true pace of species loss.
Population surveys introduce additional uncertainty. Changes in survey effort, imperfect detection, taxonomic revisions, and differences in monitoring methods can all influence apparent trends.
The number of species on Earth itself remains uncertain. Millions of species, particularly insects, fungi, microbes, and small marine organisms, remain undescribed. If unknown species disappear, they may never enter formal extinction statistics.
Researchers consequently use multiple approaches: fossil comparisons, population monitoring, Red List assessments, geographic-range changes, population viability analysis, statistical analysis of sightings, genetic evidence, and ecological modeling.
No method provides a complete measure of global extinction. Together, however, they reveal a consistent pattern of elevated and increasing human-driven extinction risk.
Conservation Can Reduce Extinction Rates
The modern extinction crisis is not simply a record of irreversible decline. Conservation studies demonstrate that human intervention can prevent extinctions.
Protected habitats, invasive-species eradication, hunting restrictions, captive breeding, habitat restoration, reintroduction, disease management, fisheries regulation, and targeted species-recovery programs have all prevented populations from disappearing.
Analyses of birds and mammals indicate that conservation action has already prevented multiple species from becoming extinct. Without these interventions, recorded modern extinction rates would have been higher.
Island restoration provides particularly clear examples. Removing introduced predators can allow threatened native birds, reptiles, mammals, and other organisms to recover.
Conservation success also demonstrates an important distinction between extinction risk and extinction itself. A species classified as highly threatened is not inevitably doomed. Reducing threats and rebuilding populations can move species away from extinction.
The challenge is scale. Protecting individual species remains important, but the broad forces driving biodiversity loss—including habitat conversion, unsustainable exploitation, invasive species, pollution, and climate change—must also be addressed if global extinction rates are to decline substantially.
Conclusion
Extinction rates provide one of the clearest measures of the changing relationship between humanity and the rest of life on Earth. The exact global rate cannot be expressed as one uncontested number. Fossil baselines are imperfect, many species remain undiscovered, extinction can take decades to confirm, and different organisms are monitored with very different levels of accuracy.
These uncertainties do not erase the broader pattern. Modern extinction and extinction risk are substantially elevated above the long-term background conditions under which biodiversity evolved.
The crisis is also larger than the list of species already declared extinct. Declining populations, shrinking geographic ranges, extinction debt, poorly studied organisms, and cascading ecological relationships mean that many losses may remain hidden or delayed.
At the same time, extinction is not always inevitable. Conservation has already prevented documented species losses, restored populations, and demonstrated that reducing human pressures can change biological trajectories.
The future extinction rate will therefore depend not only on the vulnerabilities of species but also on human decisions concerning land use, climate change, exploitation, pollution, invasive species, habitat restoration, and conservation. Extinction rates are consequently both a measure of biodiversity decline and an indicator of how effectively societies respond to it.
Global Extinction Rates and Current Assessments
1. Linking Species Local Trends from Assemblage Monitoring to Global Extinction Risk | Laura H. Antão et al. | Nature Communications | 2026-06-23
Analysis of more than 60,000 populations links declining local prevalence with higher global extinction risk and explores how monitoring data can improve assessments of species approaching extinction.
2. Temperate Local Extinctions from Climate Change Are Outpacing Tropical Extinctions | Gopal Murali, Dirk N. Karger and John J. Wiens | Nature Climate Change | 2026-06-18
A global analysis of more than 5,000 species finds climate-related local extinctions occurring more frequently among surveyed temperate species than tropical species.
3. Summary Statistics: IUCN Red List of Threatened Species | IUCN | IUCN Red List | 2026
Current Red List statistics provide extinction and threat data across major taxonomic groups and document substantial differences in extinction risk among amphibians, corals, cycads, mammals, birds and other taxa.
4. State of the World's Plants and Fungi 2026: The State of Extinction | Royal Botanic Gardens, Kew | Kew | 2026
Kew reviews the large gaps remaining in plant and fungal extinction assessments and explains why recorded extinctions probably underestimate actual losses.
5. Species Extinction Risk Continues to Worsen | United Nations | Sustainable Development Goals Report | 2026
The United Nations reports continuing deterioration in the Red List Index and more than 48,000 species facing extinction globally.
6. Location-Based Damage Factors to Assess the Impact of Future Land-Use Changes on the Biodiversity Extinction Rate | Authors | Environmental Science & Technology | 2026
Researchers translate projected land-use change into extinction-rate estimates expressed as expected extinctions per million species-years.
7. Global Assessment of Current Extinction Risks and Future Challenges for Turtles and Tortoises | Chuanwu Chen et al. | Nature Communications | 2025-08-02
A global assessment examines the exceptionally high extinction risk of turtles and tortoises and identifies biological and human factors associated with their vulnerability.
8. What 60 Years of the IUCN Red List Tells Us | IUCN | IUCN Red List | 2025
A retrospective on six decades of Red List assessments documents threatened species totals, changing extinction risk and the expanding scientific evidence used to track biodiversity loss.
9. Unpacking the Extinction Crisis: Rates, Patterns and Causes of Recent Extinctions in Plants and Animals | Kristen E. Saban and John J. Wiens | Proceedings of the Royal Society B | 2025
This analysis compares documented extinctions during the past 500 years across plants and animals and investigates how extinction rates differ among environments and taxonomic groups.
10. All Major Species Groups Are in Decline on the Red List Index | United Nations | Sustainable Development Goals Report 2025 | 2025
The UN reports continuing increases in aggregate extinction risk, with especially severe trends among corals, amphibians and cycads.
Background Extinction Rates
11. Past and Future Decline and Extinction of Species | The Royal Society | Royal Society | 2026
The Royal Society explains the extinction-rate metric and summarizes evidence that recent species losses have occurred at least tens to hundreds of times faster than pre-human rates.
12. Rate of Extinction | Biodiversity A-Z | Biodiversity A-Z | 2023-08-03
An accessible reference defines extinction rate and places the concept within international biodiversity monitoring and policy.
13. Estimates of Present-Day Extinction Rates | OpenStax | Biology 2e | 2018
This overview explains extinctions per million species-years, background rates and the difficulties involved in estimating losses among poorly known species.
14. Accelerated Modern Human-Induced Species Losses: Entering the Sixth Mass Extinction | Gerardo Ceballos et al. | Science Advances | 2015-06-19
Using deliberately conservative assumptions, researchers find recent vertebrate extinction rates substantially higher than background rates even when a comparatively high natural baseline is assumed.
15. Estimating the Normal Background Rate of Species Extinction | Jurriaan M. De Vos et al. | Conservation Biology | 2015
Fossil evidence, molecular phylogenies and diversification estimates suggest a typical background extinction rate near 0.1 extinction per million species-years, considerably below many earlier benchmarks.
16. The Biodiversity of Species and Their Rates of Extinction, Distribution, and Protection | Stuart L. Pimm et al. | Science | 2014-05-30
A major synthesis concludes that contemporary species extinction rates are roughly 1,000 times the likely natural background rate and may increase further.
17. Has the Earth's Sixth Mass Extinction Already Arrived? | Anthony D. Barnosky et al. | Nature | 2011-03-02
The study compares modern extinction with paleontological mass extinctions and concludes that current rates exceed fossil-record expectations even though total losses have not yet reached past mass-extinction magnitudes.
18. The Currency and Tempo of Extinction | Helen M. Regan et al. | The American Naturalist | 2001
The authors examine methodological problems in comparing contemporary extinction estimates with rates inferred from geological evidence.
19. Species Extinctions | National Research Council | NCBI Bookshelf | 1995
A broad scientific review discusses evidence for increasing extinction rates and the uncertainties involved in quantifying species losses.
20. How Much Do We Know About the Current Extinction Rate? | Nigel E. Stork | Trends in Ecology & Evolution | 1993
An early critical review examines why recorded extinctions alone provide an incomplete measure of contemporary species-loss rates.
Fossil Record and Deep-Time Extinction Rates
21. Improved Estimation of Macroevolutionary Rates from Fossil Data Using a Bayesian Framework | Daniele Silvestro et al. | Paleobiology | 2019
Bayesian methods incorporate preservation uncertainty when estimating speciation and extinction rates from incomplete fossil occurrences.
22. Estimating Age-Dependent Extinction: Contrasting Evidence from Fossils and Phylogenies | Daniele Silvestro et al. | Systematic Biology | 2018
Fossil and phylogenetic approaches produce contrasting estimates of how extinction probability changes as species age, highlighting uncertainties in macroevolutionary rate estimation.
23. Estimates of the Magnitudes of Major Marine Mass Extinctions in Earth History | Steven M. Stanley | Proceedings of the National Academy of Sciences | 2016
New methods distinguish background losses from mass-extinction pulses and revise estimates of the percentage of marine species lost during major crises.
24. Dynamics of Origination and Extinction in the Marine Fossil Record | John Alroy | Proceedings of the National Academy of Sciences | 2008
Fossil occurrence data reveal long-term declines in marine origination and extinction rates and show how biological diversity recovered after major extinction events.
25. Phanerozoic Marine Biodiversity Dynamics in Light of the Incompleteness of the Fossil Record | James W. Kirchner and Anne Weil | Proceedings of the National Academy of Sciences | 2005
The analysis investigates how sampling biases influence estimates of origination and extinction rates through hundreds of millions of years.
26. Determinants of Extinction in the Fossil Record | Shanan E. Peters and Michael Foote | Nature | 2002-03-28
The study examines how variation in preserved sedimentary rock can bias apparent extinction rates and interpretations of major extinction events.
27. Decline in Extinction Rates and Scale Invariance in the Fossil Record | M. E. J. Newman and Gunther J. Eble | Paleobiology | 1999
Fossil data suggest that extinction intensity declined through the Phanerozoic and that this trend can explain several broad statistical patterns in extinction events.
28. Cumulative Frequency Distribution of Past Species Extinctions | David M. Raup | NASA Technical Reports Server | 1991
Analysis of fossil taxon durations and extinction intensities illustrates the large variation between ordinary background turnover and rare mass-extinction events.
29. Rates of Extinction in Marine Invertebrates: Further Comparison Between Background and Mass Extinctions | J. Francis Thackeray | Paleobiology | 1990
Marine invertebrate data are used to compare ordinary background losses with the sharply elevated rates characteristic of extinction events.
30. Diversity Crises in the Geological Past | National Research Council | NCBI Bookshelf | 1987
A review of fossil extinction discusses the difficulty of converting geological losses into annual rates directly comparable with modern biodiversity change.
Birds and Mammals
31. Threat Reduction Must Be Coupled with Targeted Recovery Programmes to Conserve Global Bird Diversity | Authors | Nature Ecology & Evolution | 2025
Models project hundreds of bird extinctions during the next century under existing threats while testing how threat reduction and targeted recovery could reduce losses.
32. The Late-Quaternary Megafauna Extinctions | Jens-Christian Svenning et al. | Cambridge Prisms: Extinction | 2024
The review synthesizes patterns, causes and ecological effects of unusually high extinction rates among large mammals during the late Quaternary.
33. Undiscovered Bird Extinctions Obscure the True Magnitude of Human-Driven Extinction Waves | Rob Cooke et al. | Nature Communications | 2023
Researchers reconstruct unrecorded bird extinctions and identify several human-driven extinction waves that greatly exceed background rates.
34. The Macroevolutionary Impact of Recent and Imminent Mammal Extinctions on Madagascar | Luis Valente et al. | Nature Communications | 2023
Madagascar's human-driven mammal losses are evaluated against natural diversification and extinction rates to estimate how long evolution would require to replace lost diversity.
35. Extinction | Trevor Price | Ecology of a Changed World, Oxford University Press | 2022
Fossil mammal longevity provides a baseline against which rapid prehistoric and historical human-associated vertebrate losses can be compared.
36. The Past and Future Human Impact on Mammalian Diversity | Tobias Andermann et al. | Science Advances | 2020
Bayesian analysis estimates present mammal extinction rates to be roughly three orders of magnitude higher than rates at the beginning of the Late Pleistocene.
37. The Dynamics Underlying Avian Extinction Trajectories Forecast a Wave of Extinctions | Alexander L. Pigot et al. | Royal Society Open Science | 2019
Changes among Red List categories reveal an effective bird extinction rate much greater than estimates based solely on species already declared extinct.
38. Historical Bird and Terrestrial Mammal Extinction Rates and Causes | Craig Loehle and Willis Eschenbach | Diversity and Distributions | 2012
Historical records show far higher documented extinction rates on islands than continents and examine how introduced species, hunting and habitat change contributed to losses.
39. Human Impacts on the Rates of Recent, Present, and Future Bird Extinctions | Stuart Pimm et al. | Proceedings of the National Academy of Sciences | 2006-07-18
Recorded bird extinctions underestimate actual rates because many species disappeared before documentation, while conservation has prevented additional losses.
40. Mammalian Extinctions in the Late Pleistocene of Northern Eurasia and North America | Anthony J. Stuart | Biological Reviews | 1991
A detailed review examines the unusual concentration of Late Pleistocene extinctions among large terrestrial mammals and competing explanations for those losses.
Amphibians, Reptiles and Freshwater Species
41. Almost Half of European Freshwater Fishes at Risk of Extinction | IUCN | IUCN Red List | 2026-04-13
Updated European assessments indicate severe extinction risk among freshwater fishes and emphasize continuing deterioration in aquatic biodiversity.
42. The Risk of Underestimating Generation Length for Extinction Risk Assessments | Authors | Cambridge Prisms: Extinction | 2026
Amphibians are used to demonstrate how unrealistic generation-length assumptions can substantially distort estimates of extinction risk.
43. Linking Speciation to Extinction: Diversification Raises Contemporary Extinction Risk in Amphibians | Authors | Evolution | 2018
The study explores whether evolutionary diversification rates help explain why some amphibian lineages contain disproportionately high numbers of threatened species.
44. Current Extinction Rates of Reptiles and Amphibians | John Alroy | Proceedings of the National Academy of Sciences | 2015
Museum records and Bayesian modelling indicate exceptionally high recent frog extinction rates, especially in regions affected by chytrid disease.
45. Extinction Rates, Extinction-Prone Habitats, and Indicator Groups in Britain and at Larger Scales | Chris D. Thomas et al. | Biological Conservation | 2011
Comparative data suggest regional extinction rates of roughly one to five percent per century among multiple British taxonomic groups.
46. The Ecology of Extinction: Population Fluctuation and Decline in Amphibians | David M. Green | Biological Conservation | 2003
Population time series show how demographic variability, habitat and population size influence local extinction rates among amphibians.
Plants, Trees and Fungi
47. Study Projects Plant Extinction Rates Through 2100 | Kat Kerlin | UC Davis | 2026-05-07
Climate modelling projects substantial range loss for thousands of plants by 2100 and identifies climatic habitat disappearance as a major extinction mechanism.
48. Increasing Mortality of Rare Tree Species Amplifies Extinction Risk in Tropical Forests Under Climate Change | Authors | Global Ecology and Biogeography | 2026
Long-term tropical forest data indicate disproportionately high mortality among rare species and substantial projected regional extinction under warming scenarios.
49. Potential Plant Extinctions with the Loss of the Pleistocene Mammoth Steppe | Authors | Nature Communications | 2025
Ancient environmental DNA is used to estimate Pleistocene-Holocene plant extinction rates and compare them with background and modern losses.
50. Plant Species Likely to Be Extinct | Authors | Journal for Nature Conservation | 2025
Researchers review plant species listed as Critically Endangered and Possibly Extinct to identify hundreds that may already have disappeared.
51. Vascular Plant Extinction in the Continental United States and Canada | Wesley E. Knapp et al. | Conservation Biology | 2021
A comprehensive review identifies dozens of apparently extinct vascular plants and develops methods for handling taxonomic uncertainty in extinction estimates.
52. Extinction Risk and Threats to Plants and Fungi | Eimear Nic Lughadha et al. | Plants, People, Planet | 2020
The review compares documented plant extinction with broader estimates of species at risk and discusses biases caused by incomplete assessments.
53. Recent Anthropogenic Plant Extinctions Differ in Biodiversity Hotspots and Coldspots | Johannes J. Le Roux et al. | Current Biology | 2019-09-09
Regional records show elevated plant extinction rates in biodiversity hotspots and reveal changing roles for agriculture, invasive species, urbanization and hydrological change.
54. Global Dataset Shows Geography and Life Form Predict Modern Plant Extinction and Rediscovery | Aelys M. Humphreys et al. | Nature Ecology & Evolution | 2019-06-10
A global compilation identifies hundreds of modern plant extinctions and finds extinction rates well above estimated natural plant background rates.
55. Almost 600 Plants Have Already Gone Extinct | Royal Botanic Gardens, Kew | Kew | 2019-06-10
Kew summarizes evidence that documented plant extinction has occurred hundreds of times faster than estimated natural background rates.
56. The Ecology of Plant Extinction: Rates, Traits and Island Comparisons | Alan Gray | Oryx | 2018-05-21
Red List records are used to compare background, continental and island plant extinction rates and characteristics associated with vulnerability.
Marine Extinction Rates
57. The Extinction Risk–Range Change Relationship: Evidence From the Fossil Record | Authors | Global Ecology and Biogeography | 2026
Fossil records from six marine groups are used to test how reductions in geographic range translate into extinction probability.
58. The End-Cretaceous Mass Extinction Restructured Functional Diversity but Failed to Configure the Modern Marine Biota | Stewart M. Edie, Katie S. Collins and David Jablonski | Science Advances | 2025
Marine fossils reveal how a major mass extinction rapidly altered ecological and functional diversity while later evolutionary processes continued reshaping communities.
59. A Review of Recent and Future Marine Extinctions | Authors | Cambridge Prisms: Extinction | 2023
The review compares known marine extinctions with terrestrial losses and explains why poor sampling makes modern marine extinction rates particularly difficult to calculate.
60. Decreasing Phanerozoic Extinction Intensity as a Consequence of Earth Surface Oxygenation | Richard G. Stockey et al. | Proceedings of the National Academy of Sciences | 2021
Fossil and Earth-system evidence links declining long-term extinction intensity in marine animals with increasing oxygenation and changes in animal physiology.
61. Status of Marine Biodiversity in the Anthropocene | Authors | Springer | 2019
Marine biodiversity evidence is placed against background extinction estimates generally ranging from hundredths to a few extinctions per million species-years.
62. Biodiversity: The Known, Unknown, and Rates of Extinction | Mark J. Costello | Current Biology | 2015
The article reviews uncertainty in global species numbers and extinction rates and compares documented marine, freshwater and terrestrial losses.
Climate Change and Extinction Rates
63. Paris Agreement Can Reduce Climate Change-Induced Extinction Risk Fivefold and Range Shifts by Two-Thirds in Fisheries Worldwide | Danielle Gama-Maia et al. | Reviews in Fish Biology and Fisheries | 2026-07-22
Global fisheries modelling suggests limiting warming could sharply reduce projected extinction risk and climate-driven range displacement.
64. Future Scenarios for British Biodiversity Under Climate and Land-Use Change | Authors | Nature Communications | 2026
Models of plants, butterflies and birds show that lower-emissions and more sustainable land-use scenarios substantially reduce species heading toward extinction.
65. Recent Responses to Climate Change Reveal the Drivers of Species Extinction and Survival | Cristian Román-Palacios and John J. Wiens | Proceedings of the National Academy of Sciences | 2020
Recent population responses are used to investigate why some species tolerate warming while others undergo local extinction.
66. Climate-Related Local Extinctions Are Already Widespread Among Plant and Animal Species | John J. Wiens | PLOS Biology | 2016
A global synthesis finds numerous populations disappearing from the warm edges of species ranges, providing direct evidence of climate-associated local extinction.
67. Accelerating Extinction Risk from Climate Change | Mark C. Urban | Science | 2015
A synthesis of climate-impact studies concludes that extinction risk increases with warming and becomes substantially greater under high-emissions scenarios.
68. Climate Change and Extinction Risk | John Harte et al. | Nature | 2004-07-01
Researchers discuss assumptions underlying early climate-driven extinction projections and the challenges of translating shrinking ranges into extinction probabilities.
69. Extinction Risk from Climate Change | Chris D. Thomas et al. | Nature | 2004-01-08
Species-distribution modelling projected that substantial fractions of sampled species could become committed to extinction under mid-century warming scenarios.
Habitat Loss, Land Use and Extinction Debt
70. Oil Palm, Coconut and Soybean Cause More Species Extinction Than Thought | Carmen Raggenbass | ETH Zurich | 2026-06-19
Research links expanding production of major oil crops with significant global biodiversity loss and increasing extinction pressure.
71. Towards Quantifying the Mass Extinction Debt of the Anthropocene | Robert A. F. Smith et al. | Philosophical Transactions of the Royal Society A | 2021
The paper explores how short modern observation periods complicate comparisons with fossil extinction rates and introduces approaches for estimating accumulated extinction debt.
72. Global Biodiversity Outlook 5 | Convention on Biological Diversity | Global Biodiversity Outlook | 2020
The global assessment concludes that species continue moving toward extinction and that underlying pressures must be reduced to prevent substantially larger future losses.
73. Biogeography of Extinction: The Demise of Insular Mammals from the Late Pleistocene Till Today | Miranta Kouvari and Alexandra A. E. van der Geer | Palaeogeography, Palaeoclimatology, Palaeoecology | 2018
Island mammal extinction rates are strongly associated with human arrival, island size and body size, with especially severe losses during recent centuries.
74. Future Threats to Biodiversity and Pathways to Their Prevention | David Tilman et al. | Nature | 2017-05-31
Global socioeconomic and land-use trajectories are projected to place increasing numbers of mammals and birds at risk unless agricultural and conservation practices change.
75. Species-Area Relationships Always Overestimate Extinction Rates from Habitat Loss | Fangliang He and Stephen P. Hubbell | Nature | 2011
The authors argue that conventional applications of the species-area relationship can substantially exaggerate immediate extinction caused by habitat destruction.
76. Extinction Rate Estimates for Plant Populations in Revisitation Studies: Importance of Detectability | Marc Kéry | Conservation Biology | 2004
The study shows how imperfect detection can cause historical resurveys to overestimate local population extinction rates.
77. Habitat Loss and Extinction in the Hotspots of Biodiversity | Thomas M. Brooks et al. | Conservation Biology | 2002
Biodiversity-hotspot data are used to estimate species losses resulting from historical habitat destruction and to identify regions with large extinction debts.
Measuring and Interpreting Extinction Rates
78. When Do We Decide That a Species Is Extinct? | Violaine Nicolas | UNESCO Courier | 2026-04-03
An overview explains why proving extinction requires extensive surveys and why delays in declaring species extinct complicate measurements of contemporary extinction rates.
79. Target 4: Halt Human-Induced Extinction | Convention on Biological Diversity | Kunming-Montreal Global Biodiversity Framework | 2026
The global biodiversity framework identifies current species extinction rates as tens to hundreds of times higher than long-term averages and establishes reducing extinction as an international target.
80. Red List Index of Species Survival | IUCN | IUCN Red List | 2026
The Red List Index measures genuine changes in extinction risk through time rather than simply counting the increasing number of species that scientists have assessed.
81. The Sixth Mass Extinction: Fact, Fiction or Speculation? | Robert H. Cowie, Philippe Bouchet and Benoît Fontaine | Biological Reviews | 2022
A comprehensive review evaluates evidence for an ongoing sixth mass extinction, emphasizes severe undercounting of invertebrate losses and distinguishes elevated extinction rates from the formal mass-extinction threshold.
82. One-Pagers on the Goals and Targets in the Global Biodiversity Framework | Convention on Biological Diversity | CBD | 2021
The CBD summarizes evidence for rapidly elevated modern extinction rates and explains why both extinction rate and extinction risk must be tracked.
83. Maintaining Biodiversity Will Define Our Long-Term Success | Peter H. Raven and collaborators | Plant Diversity | 2020
The review contrasts fossil background extinction estimates with modern losses and discusses the possibility of substantially greater extinction during the twenty-first century.
84. Inferring Extinctions III: A Cost-Benefit Framework for Listing Extinct Species | David L. Roberts et al. | Biological Conservation | 2017
The study examines the statistical and conservation consequences of declaring a species extinct too early or leaving vanished species classified as surviving.
85. Can We Name Earth's Species Before They Go Extinct? | Mark J. Costello, Robert M. May and Nigel E. Stork | Science | 2013
The authors assess whether taxonomy can keep pace with species loss and emphasize the wide uncertainty surrounding contemporary extinction-rate estimates.
86. So-Called Background Extinction Rate Is a Sampling Artifact | Donald R. Prothero | Palaeoworld | 2006
This critique argues that conventional background extinction estimates can be distorted by incomplete sampling and the short observed ranges of rare fossil taxa.
87. Global Biodiversity Outlook: Status and Trends of Global Biodiversity | Convention on Biological Diversity | Global Biodiversity Outlook | 2006
This early global assessment compares historical bird and mammal extinctions with fossil-derived background rates and discusses the uncertainty in extrapolating tropical habitat loss.
Freshwater Species and Underestimated Extinctions
88. One-Quarter of Freshwater Fauna Threatened with Extinction | Catherine A. Sayer et al. | Nature | 2025
A global assessment of fishes, odonates and decapod crustaceans finds roughly one-quarter of assessed freshwater species threatened, emphasizing the exceptional extinction pressure affecting rivers, lakes and wetlands.
89. This Is the Way the World Ends: Estimating Extinctions of Australian Non-Marine Invertebrates | John C. Z. Woinarski et al. | Cambridge Prisms: Extinction | 2024-12-09
Researchers estimate that thousands of Australian non-marine invertebrate species may have disappeared since European colonization, illustrating how official extinction lists can drastically undercount losses among poorly studied organisms.
90. Non-Negligible Near-Term Risk of Extinction to the Eastern Migratory Population of Monarch Butterflies | Wayne E. Thogmartin et al. | U.S. Geological Survey | 2023
Population modeling finds substantial uncertainty but a meaningful risk that the eastern migratory monarch population could decline below levels needed to maintain its migration.
91. A Theory of Change to Reverse the Current Mexican Freshwater Fish Extinction Crisis | Topiltzin Contreras-MacBeath, Humberto Mejia Mojica and Juan Manuel Rivas González | Frontiers in Environmental Science | 2022-09-16
Mexico's exceptionally high number of lost and highly threatened freshwater fishes is used to develop a conservation framework centered on habitat restoration, captive populations and reintroductions.
92. Habitat Loss Predicts the Functional Extinction of Fish from Amazonian Streams During the Anthropocene | Authors | Science of the Total Environment | 2022
Simulated species losses from Amazonian streams show that ecosystem functions can disappear rapidly even before all species themselves become extinct.
93. Diversity, Distribution and Extinction Risk of Native Freshwater Fishes of South Africa | Albert Chakona et al. | Journal of Fish Biology | 2022
Assessment of South African freshwater fishes identifies geographic concentrations of threatened species and highlights habitat alteration, invasive species and water development as major risks.
94. Current Extinction Rate in European Freshwater Gastropods Greatly Exceeds That of the Late Cretaceous Mass Extinction | Thomas A. Neubauer et al. | Communications Earth & Environment | 2021-05-21
Fossil and modern records indicate that contemporary European freshwater-snail extinction rates are orders of magnitude above long-term background levels and even exceed rates calculated for the Cretaceous-Paleogene crisis.
95. Why Do Bugs Perish? Range Size and Local Vulnerability Traits as Surrogates of Odonata Extinction Risk | Maya Rocha-Ortega et al. | Proceedings of the Royal Society B | 2020-04-01
Dragonflies and damselflies demonstrate how geographic range, thermal tolerance, body size and habitat specialization can be combined to estimate extinction risk when long-term population data are missing.
96. Citizen Science Monitoring Demonstrates Dramatic Declines of Monarch Butterflies in Western North America | Cheryl B. Schultz et al. | Biological Conservation | 2017
Long-term citizen-science counts reveal an extreme decline in western monarch abundance and estimate a high probability of quasi-extinction without improved population growth.
97. Quantifying Rarity, Losses, and Risks for Lower Colorado River Basin Fishes | William F. Fagan, Christopher M. Kennedy and Peter J. Unmack | Conservation Biology | 2005
Native Colorado River fishes illustrate how rarity, shrinking distributions and small populations can be translated into quantitative estimates of extinction vulnerability.
Insect Extinction and Decline
98. Insect Decline in the Anthropocene: Death by a Thousand Cuts | David L. Wagner et al. | Proceedings of the National Academy of Sciences | 2021
The authors argue that insect declines generally result from interacting pressures rather than one universal cause, creating complex pathways toward local and global extinction.
99. Geographical, Temporal and Taxonomic Biases in Insect GBIF Data on Biodiversity and Extinction | Maya Rocha-Ortega et al. | Ecological Entomology | 2021
Global insect records are shown to contain major geographic and taxonomic biases, complicating attempts to infer worldwide extinction rates from available observations.
100. Further Evidence for a Global Decline of the Entomofauna | Francisco Sánchez-Bayo | Austral Entomology | 2021
Additional long-term datasets from several continents are reviewed to broaden the evidence base for declines in insect abundance and diversity.
101. Are Insects Heading Toward Their First Mass Extinction? | Conrad C. Labandeira | Annals of the Entomological Society of America | 2021
Comparison with the fossil record suggests that the current biodiversity crisis could be fundamentally different for insects because past major geological crises did not produce losses resembling modern anthropogenic pressures.
102. Scientists' Warning to Humanity on Insect Extinctions | Pedro Cardoso et al. | Biological Conservation | 2020
Conservation scientists warn that insect losses involve not only species extinctions but also declines in abundance, biomass, ecological functions and evolutionary diversity.
103. Meta-Analysis Reveals Declines in Terrestrial but Increases in Freshwater Insect Abundances | Roel van Klink et al. | Science | 2020
Long-term datasets reveal contrasting average trends between terrestrial and freshwater insect populations, illustrating why abundance decline should not automatically be treated as a uniform global extinction rate.
104. Insect Declines in the Anthropocene | David L. Wagner | Annual Review of Entomology | 2020
A major review synthesizes evidence of declines among terrestrial, flying and aquatic insects while emphasizing geographic and taxonomic gaps that make global extinction rates difficult to calculate.
105. Worldwide Decline of the Entomofauna: A Review of Its Drivers | Francisco Sánchez-Bayo and Kris A. G. Wyckhuys | Biological Conservation | 2019
The review assembles evidence for widespread insect declines and identifies habitat loss, intensive agriculture, pesticides, pollution, invasive species and climate change as important drivers.
106. Insect Population Trends and the IUCN Red List Process | Authors | Journal of Insect Conservation | 2019
Butterfly and moth monitoring demonstrates how strongly fluctuating insect populations can produce misleading extinction-risk classifications when assessment periods are too short.
107. Modern Insect Extinctions, the Neglected Majority | Robert R. Dunn | Conservation Biology | 2005
The paper argues that modern extinction estimates are strongly biased toward vertebrates even though insects comprise much of known animal diversity.
Extinction Debt and Delayed Species Loss
108. Mind the Lag: Understanding Genetic Extinction Debt for Conservation | Roberta Gargiulo, Katharina B. Budde and Myriam Heuertz | Trends in Ecology & Evolution | 2024-11-20
Population declines can leave delayed genetic consequences, meaning apparently adequate genetic diversity may temporarily mask long-term extinction vulnerability.
109. The Rate of Species Extinction in Declining or Fragmented Ecological Communities | Authors | PLOS ONE | 2023
Modeling shows that abrupt habitat fragmentation and gradual population erosion can generate very different temporal patterns of extinction debt.
110. Revisiting Extinction Debt Through the Lens of Multitrophic Networks and Meta-Ecosystems | Grégoire Blanchard and François Munoz | Oikos | 2023
The extinction-debt concept is extended beyond individual species to include delayed losses propagated through ecological interactions and connected ecosystems.
111. Half-Millennium Evidence Suggests That Extinction Debts of Global Vertebrates Started in the Second Industrial Revolution | Ziyan Liao, Shushi Peng and Youhua Chen | Communications Biology | 2022-12-13
Historical forest-cover data suggest that extinction debts among forest mammals, reptiles and amphibians began accumulating during nineteenth-century industrialization.
112. Widespread Extinction Debts and Colonization Credits in United States Breeding Bird Communities | Yacob Haddou et al. | Nature Ecology & Evolution | 2022-02-10
Present-day bird communities across much of the United States still reflect historical landscapes, revealing widespread delayed responses to urbanization and other land-cover changes.
113. Dynamics of Extinction Debt Across Five Taxonomic Groups | Authors | Nature Communications | 2016
Meta-analysis of mammals, birds, reptiles, plants and other organisms shows that delayed extinction can persist over widely varying time scales and tends to last longer in larger habitat remnants.
114. Habitat Fragmentation and Its Lasting Impact on Earth's Ecosystems | Nick M. Haddad et al. | Science Advances | 2015
Long-running fragmentation experiments show that species losses and impairment of ecosystem functions can continue increasing for decades after landscapes are divided.
115. Habitat Fragmentation Causes Immediate and Time-Delayed Biodiversity Loss at Different Trophic Levels | Jochen Krauss et al. | Ecology Letters | 2010
Long-term European grassland data show that plants and animals respond to habitat fragmentation on different time scales, producing persistent extinction debts.
116. Extinction Debt: A Challenge for Biodiversity Conservation | Mikko Kuussaari et al. | Trends in Ecology & Evolution | 2009
This influential review explains why habitat destruction today can generate extinctions decades or centuries later, making current species counts an incomplete measure of ecological damage.
117. Habitat Destruction and the Extinction Debt | David Tilman et al. | Nature | 1994
A foundational theoretical paper demonstrates that species can remain temporarily after habitat destruction even when eventual extinction has become mathematically unavoidable.
Coextinction and Cascading Extinctions
118. Extinction Cascades, Community Collapse, and Recovery Across a Mesozoic Hyperthermal Event | Authors | Nature Communications | 2024
Fossil food webs show how primary extinctions during ancient rapid warming could propagate through ecological networks and restructure entire communities.
119. Cascading Extinctions as a Hidden Driver of Insect Decline | Rachel Kehoe, Enric Frago and Dirk Sanders | Ecological Entomology | 2021
The review argues that insect losses caused by habitat destruction, pesticides and climate change may generate additional unrecorded extinctions through disrupted species interactions.
120. Trophic Redundancy Reduces Vulnerability to Extinction Cascades | Dirk Sanders et al. | Proceedings of the National Academy of Sciences | 2018
Experimental plant-insect food webs demonstrate that ecological redundancy can buffer communities against secondary extinction following initial species losses.
121. Co-Extinctions Annihilate Planetary Life During Extreme Environmental Change | Giovanni Strona and Corey J. A. Bradshaw | Scientific Reports | 2018
Ecological-network simulations suggest that interactions among species can greatly magnify extinction losses under severe climate and environmental change.
122. Secondary Extinctions of Biodiversity | Joseph F. Brodie et al. | Trends in Ecology & Evolution | 2014
The review explains when the disappearance of one species is most likely to cause further losses among specialized predators, prey, hosts, parasites or mutualists.
123. Secondary Extinctions in Food Webs: A Bayesian Network Approach | Anna Eklöf et al. | Methods in Ecology and Evolution | 2013
Bayesian network models are tested as tools for predicting which species will disappear after other members of a food web are removed.
124. Cascading Extinctions and Community Collapse in Model Food Webs | Jennifer A. Dunne and Richard J. Williams | Philosophical Transactions of the Royal Society B | 2009
Simulated food webs reveal thresholds at which accumulating primary losses can rapidly destabilize communities and generate widespread secondary extinction.
125. Trophically Unique Species Are Vulnerable to Cascading Extinction | Authors | The American Naturalist | 2008
Food-web analysis finds that species with unusually distinctive trophic roles can be particularly susceptible to secondary extinction.
126. Species Coextinctions and the Biodiversity Crisis | Lian Pin Koh et al. | Science | 2004
The loss of hosts can trigger extinction among parasites, mutualists and other dependent organisms, substantially increasing the total biodiversity consequences of primary extinctions.
127. Network Structure and Biodiversity Loss in Food Webs: Robustness Increases with Connectance | Jennifer A. Dunne, Richard J. Williams and Neo D. Martinez | Ecology Letters | 2002
Food-web simulations show that removing highly connected species can produce disproportionately large cascades of secondary extinctions.
Islands, Invasive Species and Elevated Extinction Rates
128. Mouse Eradication Is Required to Prevent Local Extinction of an Endangered Seabird on an Oceanic Island | Christopher W. Jones et al. | Animal Conservation | 2021
Population models for MacGillivray's prion demonstrate how predation by introduced mice can push an island seabird toward extinction.
129. Globally Important Islands Where Eradicating Invasive Mammals Will Benefit Highly Threatened Vertebrates | Nick D. Holmes et al. | PLOS ONE | 2019
Researchers identify islands where invasive-mammal removal could produce particularly large reductions in extinction risk for threatened vertebrates.
130. Past and Estimated Future Impact of Invasive Alien Mammals on Insular Threatened Vertebrate Populations | Donald R. Spatz et al. | Nature Communications | 2017
Models suggest that invasive mammals threaten a large proportion of island vertebrate populations and that eradication could prevent many projected local extinctions.
131. Invasive Predators and Global Biodiversity Loss | Tim S. Doherty et al. | Proceedings of the National Academy of Sciences | 2016
Introduced mammalian predators are linked to hundreds of threatened and extinct vertebrates, making predation by invasive species a major contributor to modern extinction.
132. Invasive Mammal Eradication on Islands Results in Substantial Conservation Gains | Holly P. Jones et al. | Proceedings of the National Academy of Sciences | 2016
Hundreds of island populations have benefited from eradication of introduced mammals, showing that an important driver of island extinction can sometimes be directly reversed.
133. Evolution and Extinction of Land Snails on Oceanic Islands | Satoshi Chiba and Robert H. Cowie | Annual Review of Ecology, Evolution, and Systematics | 2016
Island land snails illustrate both exceptional evolutionary diversification and exceptionally severe modern extinction associated with invasive predators and habitat transformation.
134. Alien Species as a Driver of Recent Extinctions | Céline Bellard, Phillip Cassey and Tim M. Blackburn | Biology Letters | 2016
Global extinction records demonstrate the disproportionate role of introduced species in recent animal and plant losses, particularly on islands.
135. Magnitude and Variation of Prehistoric Bird Extinctions in the Pacific | Richard P. Duncan et al. | Proceedings of the National Academy of Sciences | 2013
Modeling archaeological evidence suggests human colonization of Pacific islands caused the extinction of far more bird species than the surviving historical record alone indicates.
136. Global Patterns and Drivers of Avian Extinctions at the Species and Subspecies Level | Judit K. Szabo et al. | PLOS ONE | 2012
Historical bird losses reveal strong associations between extinction, island distributions, invasive species, exploitation and habitat destruction.
137. Invasive Species Are a Leading Cause of Animal Extinctions | Miguel Clavero and Emili García-Berthou | Trends in Ecology & Evolution | 2005
Analysis of extinction records highlights invasive species as a major cause of documented animal extinctions rather than merely a secondary ecological disturbance.
Marine Species, Sharks and Corals
138. Over 40% of Coral Species Face Extinction | IUCN | IUCN Red List | 2024-11-13
Updated assessments conclude that roughly 44 percent of warm-water reef-building coral species face extinction risk, substantially higher than in the previous global assessment.
139. Half a Century of Rising Extinction Risk of Coral Reef Sharks and Rays | Samantha C. Sherman et al. | Nature Communications | 2023
Global assessment of reef-associated sharks and rays finds that a majority face elevated extinction risk, primarily from fishing pressure.
140. Tracking the Rising Extinction Risk of Sharks and Rays in the Northeast Atlantic Ocean and Mediterranean Sea | Rachel H. L. Walls and Nicholas K. Dulvy | Scientific Reports | 2021-07-28
Red List indices document worsening extinction risk over several decades, with especially severe threat levels in the Mediterranean.
141. Half a Century of Global Decline in Oceanic Sharks and Rays | Nathan Pacoureau et al. | Nature | 2021-01-27
Long-term abundance records reveal dramatic global depletion of oceanic sharks and rays accompanied by sharply increasing extinction risk.
142. Overfishing Drives Over One-Third of All Sharks and Rays Toward a Global Extinction Crisis | Nicholas K. Dulvy et al. | Current Biology | 2021
A global reassessment finds extinction risk has increased substantially across sharks, rays and chimaeras, with overfishing affecting every threatened species in the analysis.
143. Paleontological Baselines for Evaluating Extinction Risk in the Modern Oceans | Seth Finnegan et al. | Science | 2015
Fossil marine extinction patterns are used to identify modern taxa and regions whose biological characteristics may leave them unusually vulnerable to future losses.
144. Global Patterns of Extinction Risk in Marine and Non-Marine Systems | Thomas J. Webb and Beth L. Mindel | Current Biology | 2015
Comparison across environmental realms shows that marine species exhibit many of the same biological associations with extinction risk found among terrestrial organisms.
145. One-Third of Reef-Building Corals Face Elevated Extinction Risk from Climate Change and Local Impacts | Kent E. Carpenter et al. | Science | 2008
The first comprehensive global assessment of reef-building corals found widespread threatened status associated with bleaching, disease, warming and local habitat degradation.
146. Life Histories and Extinction Risk in Exploited Marine Fishes | John D. Reynolds, Nicholas K. Dulvy, Nicholas B. Goodwin and Jeffrey A. Hutchings | Proceedings of the Royal Society B | 2005
Life-history traits such as slow growth and late maturity help explain why some heavily exploited marine fishes decline more rapidly and recover more slowly.
147. Extinction Vulnerability in Marine Populations | Nicholas K. Dulvy, Yvonne Sadovy and John D. Reynolds | Fish and Fisheries | 2003
Evidence from marine populations challenges the assumption that widespread ocean species are naturally protected from extinction.
Mammals and Primates
148. Global Primary Predictors of Extinction Risk in Primates | Carmen Galán-Acedo et al. | Proceedings of the Royal Society B | 2024
Global analysis finds that forest availability, body size, home-range requirements and climate instability influence primate extinction risk differently among biogeographic regions.
149. Ecological Marginalization Is Widespread and Increases Extinction Risk in Mammals | Authors | Proceedings of the National Academy of Sciences | 2023
Mammals whose ranges have contracted are often confined to environmentally marginal portions of their former niches, increasing risk beyond the effect of range loss alone.
150. Scaling the Extinction Vortex: Body Size as a Predictor of Population Dynamics Close to Extinction Events | Sam E. Williams et al. | Ecology and Evolution | 2021
Population trajectories near extinction are compared across body sizes to determine how life-history differences influence the final stages of population collapse.
151. Changes in Human Footprint Drive Changes in Species Extinction Risk | Moreno Di Marco et al. | Nature Communications | 2018
Increasing cumulative human pressure is strongly associated with worsening extinction risk among terrestrial mammals.
152. Impending Extinction Crisis of the World's Primates | Alejandro Estrada et al. | Science Advances | 2017-01-18
The majority of primate species are experiencing population decline, with habitat loss, agriculture, hunting and trade placing a large proportion of the order at risk.
153. Geography of Current and Future Global Mammal Extinction Risk | Ana D. Davidson et al. | PLOS ONE | 2017
Spatial modeling identifies regions where mammal extinction risk is already concentrated and where future environmental pressure could generate additional hotspots.
154. Extinction Risk Is Most Acute for the World's Largest and Smallest Vertebrates | William J. Ripple et al. | Proceedings of the National Academy of Sciences | 2017
Analysis of tens of thousands of vertebrates suggests that both unusually large and unusually small-bodied species can face elevated extinction risk for different reasons.
155. Multiple Ecological Pathways to Extinction in Mammals | Ana D. Davidson et al. | Proceedings of the National Academy of Sciences | 2009
Different combinations of biological traits and human threats create multiple pathways by which mammal species can approach extinction.
156. Multiple Causes of High Extinction Risk in Large Mammal Species | Marcel Cardillo et al. | Science | 2005
Large mammals are shown to become especially vulnerable when naturally slow life histories interact with high human population densities and other external pressures.
157. Predicting Extinction Risk in Declining Species | Andy Purvis et al. | Proceedings of the Royal Society B | 2000
Comparative analysis of carnivores and primates identifies small ranges, low population density, slow life histories and high trophic position as important intrinsic risk factors.
Amphibians and Reptiles
158. Ongoing Declines for the World's Amphibians in the Face of Emerging Threats | Jennifer A. Luedtke et al. | Nature | 2023
Updated global assessments show amphibian extinction risk continuing to deteriorate, with climate change becoming an increasingly important driver alongside habitat loss and disease.
159. A Global Reptile Assessment Highlights Shared Conservation Needs of Tetrapods | Neil Cox et al. | Nature | 2022
Comprehensive global assessment finds roughly one-fifth of reptile species threatened and identifies agriculture, logging, urban development and invasive species among major pressures.
160. The Use of Geospatial Data and Bayesian Networks to Assess the Risk Status of Mexican Amphibians | Authors | Global Ecology and Conservation | 2019
Quantitative habitat-loss data are tested as an alternative to expert judgment for evaluating extinction risk among Mexican amphibians.
161. Phylogenetic and Trait-Based Prediction of Extinction Risk for Data-Deficient Amphibians | Pamela González-del-Pliego et al. | Current Biology | 2019
Modeling suggests that many amphibians lacking formal threat assessments may actually be endangered, including species that could already have disappeared.
162. Amphibian Fungal Panzootic Causes Catastrophic and Ongoing Loss of Biodiversity | Ben C. Scheele et al. | Science | 2019
Chytrid fungal disease is linked to declines in hundreds of amphibian species and numerous suspected extinctions, making it one of the most destructive wildlife diseases recorded.
163. The Conservation Status of the World's Reptiles | Monika Böhm et al. | Biological Conservation | 2013
A representative global assessment establishes extinction-risk patterns for reptiles and identifies freshwater, tropical and island species as particularly vulnerable.
164. Global Amphibian Extinction Risk Assessment for the Panzootic Chytrid Fungus | Matthew C. Fisher et al. | Diversity | 2009
Biological traits and modeled pathogen distribution are combined to identify amphibian species particularly vulnerable to chytridiomycosis.
165. Are We in the Midst of the Sixth Mass Extinction? A View from the World of Amphibians | David B. Wake and Vance T. Vredenburg | Proceedings of the National Academy of Sciences | 2008
Severe global amphibian declines are compared with past mass-extinction phenomena and used as evidence of extraordinarily rapid modern biodiversity loss.
166. Amphibian Decline or Extinction? Current Declines Dwarf Background Extinction Rate | Malcolm L. McCallum | Journal of Herpetology | 2007
Historical records are used to argue that observed amphibian disappearance represents a rate far exceeding estimated natural background extinction.
167. Status and Trends of Amphibian Declines and Extinctions Worldwide | Simon N. Stuart et al. | Science | 2004
The first comprehensive global amphibian assessment documents widespread population declines, threatened species and enigmatic losses even from apparently intact habitat.
Estimating Extinction Risk and Dealing with Uncertainty
168. Extinction Risk Analysis of the World's Species | IUCN | IUCN Red List | 2026
The Red List assessment framework explains how range size, population trends, population size and quantitative extinction models are integrated into standardized threat categories.
169. Predicting the Conservation Status of Data-Deficient Species | Lucie M. Bland et al. | Conservation Biology | 2015
Statistical methods are evaluated for estimating threat categories among species that cannot yet be formally assessed because ecological data are inadequate.
170. GeoCAT: Geospatial Conservation Assessment Tool | Steven P. Bachman et al. | ZooKeys | 2011
A geospatial tool allows researchers to calculate range-based measures used in Red List assessments, improving preliminary estimates of extinction risk for poorly assessed organisms.
171. Converting Endangered Species Categories to Probabilities of Extinction for Phylogenetic Conservation Prioritization | Arne Ø. Mooers et al. | PLOS ONE | 2008
The study develops methods for translating Red List categories into approximate extinction probabilities that can be used in conservation-priority calculations.
172. Quantifying the Extinction Vortex | William F. Fagan and Elizabeth E. Holmes | Ecology Letters | 2006
Long-term records of vertebrate populations followed all the way to extinction reveal accelerating decline and variability as populations approach disappearance.
173. Biodiversity Indicators Based on Trends in Conservation Status: Strengths of the IUCN Red List Index | Stuart H. M. Butchart et al. | Conservation Biology | 2006
The authors explain how repeated standardized threat assessments can distinguish genuine changes in extinction risk from changes caused by improved knowledge.
174. Measuring Global Trends in the Status of Biodiversity: Red List Indices for Birds | Stuart H. M. Butchart et al. | PLOS Biology | 2004
Changes in species' threat categories are converted into an index capable of measuring whether aggregate extinction risk is improving or worsening through time.
175. When Did the Dodo Become Extinct? | David L. Roberts and Andrew R. Solow | Nature | 2003
Statistical analysis of historical sightings illustrates how scientists can infer likely extinction dates when the disappearance of the last individual was never directly observed.
176. A Practical Handbook for Population Viability Analysis | Mark S. Boyce | Conservation Biology | 2000
Population viability analysis provides a quantitative framework for estimating how demographic variability, environmental change and small population size affect extinction probability.
177. Inferring Extinction from Sighting Records | Andrew R. Solow | Ecology | 1993
A statistical framework uses the timing of confirmed observations to estimate whether an unobserved species is likely to have become extinct.
Conservation, Recovery and Prevented Extinctions
178. Rate and Extent of Genetic Diversity Loss Under Non-Equilibrium Scenarios of Habitat Loss | Authors | Biological Conservation | 2024
Spatial simulations show that habitat destruction can create delayed losses of genetic diversity analogous to extinction debt, leaving a temporary window in which restoration or genetic rescue may reduce long-term extinction risk.
179. IUCN's Green Status of Species Measures the Impact of Conservation Action | IUCN | IUCN | 2021-07-28
The Green Status supplements extinction-risk assessment by measuring recovery and estimating what species' status would have been without past conservation.
180. The Threat of Invasive Species to IUCN-Listed Critically Endangered Species | Authors | Global Ecology and Conservation | 2021
Systematic review shows that invasive organisms threaten a large share of Critically Endangered species, with disease particularly important for amphibians and introduced predators important on islands.
181. How Many Bird and Mammal Extinctions Has Recent Conservation Action Prevented? | Friederike C. Bolam et al. | Conservation Letters | 2020
Expert assessment concludes that conservation interventions prevented dozens of bird and mammal extinctions since 1993 and that extinction rates would otherwise have been substantially higher.
182. Bending the Curve of Terrestrial Biodiversity Needs an Integrated Strategy | David Leclère et al. | Nature | 2020
Global scenario modeling indicates that expanded conservation combined with changes in food production and consumption could substantially reduce future biodiversity losses.
183. Quantifying Species Recovery and Conservation Success to Develop an IUCN Green Status of Species | H. Resit Akçakaya et al. | Conservation Biology | 2018
A framework is developed for measuring not simply whether a species avoids extinction but how far conservation has restored its distribution, abundance and ecological function.
184. The Impact of Conservation on the Status of the World's Vertebrates | Michael Hoffmann et al. | Science | 2010
Global Red List trends indicate continuing deterioration among vertebrates but also demonstrate that targeted conservation has prevented some species from moving closer to extinction.
185. Global Biodiversity Scenarios for the 21st Century | Henrique M. Pereira et al. | Science | 2010
Multiple global models project continued biodiversity loss under many socioeconomic scenarios while showing that outcomes differ greatly according to land use, climate and policy choices.
