Urban Biodiversity
- NOTOC**
Urban Biodiversity
Urban biodiversity encompasses the plants, animals, fungi, microorganisms, and ecological communities that live within cities and other densely settled environments. Cities are not biologically empty landscapes. They contain a complex mosaic of parks, forests, gardens, street trees, vacant lots, waterways, wetlands, cemeteries, green roofs, walls, roadsides, and remnant natural habitats that can support substantial biological diversity.
Urbanization nevertheless transforms ecosystems profoundly. Buildings, roads, habitat fragmentation, pollution, artificial light, noise, intensive landscape management, and human disturbance can reduce species abundance, eliminate habitat specialists, and favor organisms capable of adapting to human-dominated environments. One common consequence is biotic homogenization, in which cities in different regions increasingly contain similar sets of widespread and urban-tolerant species.
At the same time, cities can provide important refuges for native and even threatened species. In some regions, urban areas contain remnants of ecosystems that have disappeared from surrounding agricultural or developed landscapes. The conservation challenge is therefore not simply to make cities greener, but to create and maintain ecologically diverse, connected, and functional urban habitats.
Cities as Ecological Systems
Modern urban ecology increasingly treats cities as ecosystems rather than places where ecosystems have simply been displaced. Human infrastructure, ecological processes, climate, land-use history, social conditions, and biological evolution interact to determine which species can survive in urban environments.
Urbanization acts as an ecological filter. Species differ greatly in their ability to tolerate fragmented habitats, human disturbance, altered temperatures, artificial lighting, noise, reduced vegetation, and unfamiliar food sources. Generalist species often adapt successfully, while organisms dependent on specialized habitats may decline.
Urban environments can also create new evolutionary pressures. Populations living in cities may experience different temperatures, diets, predators, pollutants, movement barriers, and reproductive environments than populations outside cities. Urban biodiversity therefore includes not only changes in species distribution but also ecological and evolutionary changes occurring within surviving populations.
The ecological history of a city matters as well. Past development patterns, park creation, colonial planning, industrialization, transportation networks, neighborhood wealth, and landscape-management decisions can continue shaping biodiversity decades or centuries later.
Green Space, Habitat Connectivity and Urban Planning
The amount of habitat available within a city is one of the strongest determinants of urban biodiversity. Large habitat patches generally support more species, but size alone is not sufficient. Vegetation structure, habitat quality, connectivity, surrounding land use, water availability, and management practices also influence ecological value.
Networks of connected habitats are particularly important. Parks, gardens, street trees, river corridors, wetlands, railway margins, road verges, green roofs, and other spaces can function as ecological stepping stones that allow organisms to move through otherwise developed landscapes.
Urban parks often represent some of the richest biodiversity habitats within cities. However, research suggests that no single type of park maximizes biodiversity for every species. A city containing many parks with different vegetation structures, sizes, water features, tree ages, grasslands, shrubs, and management regimes may support greater overall biodiversity than a collection of nearly identical landscaped parks.
Informal green spaces also matter. Vacant lots, abandoned industrial sites, spontaneous woodlands, wastelands, cemeteries, university campuses, and other less intensively managed locations can provide surprisingly valuable habitat. Such areas are frequently overlooked because they do not resemble conventional parks.
Biodiversity-sensitive planning increasingly attempts to incorporate ecological needs directly into urban development. Rather than treating wildlife conservation as an activity restricted to nature reserves, this approach considers buildings, streets, neighborhoods, public squares, drainage systems, and other components of the city as potential elements of an ecological network.
Trees, Gardens and Urban Vegetation
Urban forests and street trees provide some of the most visible components of city biodiversity. Trees supply nesting sites, food, shade, shelter, movement corridors, carbon storage, cooling, and other ecosystem services.
Tree diversity can also make urban forests more ecologically resilient. A city dominated by only a few tree species may be particularly vulnerable to pests, diseases, drought, or climate change. Maintaining a mixture of species, ages, sizes, and vegetation layers can increase habitat complexity.
Native vegetation can be particularly valuable for organisms that evolved alongside local plant communities, although non-native plants can also provide food, shelter, and other ecological functions. Urban biodiversity strategies increasingly emphasize evaluating the ecological role of vegetation rather than assuming that all green space provides equivalent habitat.
Shrubs and understory vegetation are especially important. Landscapes consisting mainly of isolated trees surrounded by closely mown lawns may appear green while providing relatively little structural diversity. Adding shrubs, flowering vegetation, leaf litter, logs, dead wood, and other habitat features can substantially increase ecological complexity.
Private gardens collectively occupy large portions of many cities. Individual yards may be small, but networks of wildlife-friendly gardens can form significant habitat systems. Diverse plantings, flowering resources, reduced pesticide use, composting, mulching, less intensive soil disturbance, and retention of habitat structures can increase their ecological value.
Pollinators, Insects and Small Urban Habitats
Bees, butterflies, beetles, spiders, moths, parasitoid wasps, and other invertebrates make up much of urban biodiversity. Their responses to urbanization vary considerably.
Cities can sometimes support surprisingly rich bee communities, particularly where gardens, parks, roadsides, vacant areas, and other habitats provide continuous flowering resources and nesting opportunities. However, urban environments are not universally beneficial to insects. Fragmentation, pesticides, artificial lighting, intensive mowing, loss of native vegetation, and habitat simplification can reduce insect abundance and diversity.
Small changes in landscape management can produce substantial ecological benefits. Reducing mowing frequency allows plants to flower and creates habitat for insects. Mosaic mowing, in which different areas are cut at different times, can maintain recreational lawns while preserving food and shelter for pollinators.
Green roofs can provide additional habitat in densely developed districts. Their conservation value depends heavily on plant diversity, vegetation structure, substrate depth, roof size, age, height, and connectivity with surrounding habitat. Different organisms respond differently: a roof useful to certain wild bees may provide much less suitable habitat for other insect groups.
Green walls and even ordinary walls can also support plants and insects. Together, roofs, façades, balconies, streets, and other built surfaces expand the concept of urban habitat into three dimensions.
Birds, Mammals, Reptiles and Amphibians
Urban vertebrate communities include birds, bats, mammals, reptiles, amphibians, and other wildlife. Some species adapt successfully to cities, while others decline sharply.
Bird diversity often increases where cities retain mature trees, native vegetation, shrubs, grasslands, water, and connected green spaces. Dense building cover, traffic, artificial lighting, and noise can reduce habitat quality and alter which species occupy urban landscapes.
Urbanization can change entire ecological communities rather than simply reducing the number of species. Sensitive birds may disappear while adaptable species increase, causing bird communities in different cities to become increasingly similar.
Mammals respond strongly to vegetation, climate, habitat connectivity, and human disturbance. Generalists may prosper in urban environments, while species dependent on wetlands or other specialized habitats can struggle to persist.
Bats depend on combinations of roosting sites, feeding habitats, water, insect populations, and movement corridors. Urban parks, forests, waterways, and mature trees can therefore be important components of bat conservation.
Reptiles and amphibians frequently depend on remnant natural areas, wetlands, ponds, vegetation, and landscape connectivity. Habitat simplification can disproportionately affect specialized predators such as snakes and amphibians dependent on aquatic breeding habitat.
Soils, Water and Hidden Urban Biodiversity
Much urban biodiversity exists below ground or underwater and is therefore easily overlooked.
Urban soils contain bacteria, fungi, protists, springtails, mites, worms, insects, and other organisms that contribute to decomposition, nutrient cycling, plant growth, soil structure, water infiltration, and carbon storage. Greater biological diversity can improve the ability of urban soils to perform several ecological functions simultaneously.
Vegetation type and management strongly influence soil communities. Heavy recreational pressure, soil compaction, intensive maintenance, and simplified vegetation can reduce belowground diversity, while complex vegetation and less intensive management can help maintain it.
Urban ponds can support amphibians, dragonflies, aquatic insects, birds, plants, and numerous microorganisms. Even small garden ponds may contribute to freshwater biodiversity when they contain appropriate vegetation and are connected to other aquatic or terrestrial habitats.
Streams, rivers, wetlands, and lakes are often severely altered by urbanization through pollution, channelization, wastewater, stormwater runoff, habitat modification, and development. Restoration efforts increasingly seek to recover ecological functions by restoring wetlands, improving riparian vegetation, reconnecting waterways, and in some cases uncovering streams that were historically placed underground.
Environmental DNA, or eDNA, is providing new ways to monitor this hidden biodiversity. DNA recovered from water, soil, and other environmental samples can reveal the presence of fish, amphibians, mammals, birds, and other organisms without requiring researchers to observe every species directly.
Management, Restoration and Urban Rewilding
Urban biodiversity is strongly influenced by how green spaces are maintained. Frequent mowing, removal of dead wood, pesticide use, pruning, leaf removal, simplified planting, and intensive landscaping can eliminate important habitat structures.
Reducing maintenance intensity in selected areas can increase ecological value. Allowing grasses and wildflowers to grow, retaining dead branches where safe, protecting old trees, restoring native vegetation, adding shrubs, and leaving portions of parks less intensively managed can create habitat for many species.
Ecological restoration in cities differs from restoration in relatively undisturbed landscapes. Urban ecosystems may have experienced centuries of development, introduced species, altered soils, pollution, hydrological changes, and climate modification. Returning them to a precise historical condition may therefore be impossible or undesirable.
Urban restoration can instead focus on recovering ecological functions, increasing habitat complexity, protecting native species, improving connectivity, and creating resilient ecosystems capable of surviving future environmental change.
Urban rewilding extends this approach by allowing more spontaneous ecological processes to occur. Vacant lots, abandoned industrial land, spontaneous woodlands, street vegetation, and other wild spaces can sometimes develop rich biological communities with relatively little intervention.
Biodiversity, Human Well-Being and Environmental Equity
Urban biodiversity directly influences people's everyday relationships with nature. Parks, gardens, birds, flowering plants, trees, ponds, and other elements of biodiversity can provide opportunities for recreation, education, relaxation, wildlife observation, and psychological restoration.
Research increasingly distinguishes between access to green space and access to biologically diverse green space. A heavily manicured lawn with a few ornamental trees may provide some recreational and cooling benefits but support much less biodiversity than a structurally complex landscape containing multiple vegetation layers and habitat types.
The distribution of urban nature is also an environmental-justice issue. Tree canopy, park access, habitat quality, and biodiversity are often distributed unevenly among neighborhoods. Historical planning, segregation, colonial land-use systems, income inequality, investment patterns, and development decisions can leave lasting ecological inequalities.
Greening projects can improve environmental conditions while also creating unintended social consequences. New parks and ecological improvements may increase property values and contribute to displacement unless planners incorporate affordability and community needs. The goal is therefore not simply to create greener neighborhoods but to create equitable access to high-quality urban nature.
Citizen science can strengthen both ecological research and public involvement. Residents recording birds, insects, plants, reptiles, amphibians, or other organisms can generate large biodiversity datasets while developing greater awareness of local ecosystems.
Governance and the Future of Biodiversity-Friendly Cities
Protecting biodiversity in rapidly growing cities requires cooperation among ecologists, planners, landscape architects, engineers, governments, community organizations, landowners, and residents.
Nature-based solutions increasingly combine biodiversity objectives with other urban needs. Wetlands, trees, green roofs, rain gardens, restored streams, vegetated drainage systems, and connected parks can provide habitat while simultaneously reducing heat, storing carbon, managing stormwater, improving air quality, and creating recreational space.
Effective biodiversity plans require more than broad conservation goals. Cities need measurable indicators, ecological monitoring, long-term funding, clear responsibilities, and methods for evaluating whether biodiversity is actually improving.
Conservation should also extend beyond major parks and protected areas. Much of the ecological potential of cities lies in the spaces between formal reserves: gardens, school grounds, cemeteries, roadsides, waterways, rooftops, vacant land, institutional campuses, residential neighborhoods, and commercial landscapes.
The emerging model is therefore a citywide ecological network in which biodiversity is incorporated into ordinary urban infrastructure rather than confined to isolated pockets of nature.
Conclusion
Urbanization is one of the world's major forces transforming biodiversity, but cities are not necessarily biological wastelands. They can simultaneously threaten species, create novel ecosystems, preserve remnant habitats, and provide refuges for organisms that have lost habitat elsewhere.
The strongest evidence across urban biodiversity research points toward several recurring principles: protect existing natural habitats, provide sufficient ecological space, maintain connectivity, increase vegetation and habitat complexity, reduce unnecessarily intensive management, preserve wetlands and waterways, diversify urban forests, support pollinators and soil organisms, and incorporate biodiversity directly into planning and development.
Successful urban conservation ultimately depends on recognizing cities as ecosystems shared by people and many other species. Biodiversity-friendly cities are not simply cities with more vegetation. They are cities designed and managed to support diverse, interconnected, functioning ecological communities while providing equitable opportunities for people to experience and benefit from nature.
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Urban Biodiversity: Foundations and Global Patterns
1. Global Patterns and Drivers of Urban Biotic Homogenization: A Meta-Analysis
| Zuñiga-Palacios et al. | Global Ecology and Biogeography | 2026-03-02
Global evidence shows that urbanization frequently makes biological communities more alike, although patterns vary among regions, taxa, and degrees of urbanization.
2. Eco-evolutionary dynamics shaping biodiversity in the urban mosaic
| Valentina Alaasam et al. | Nature Reviews Biodiversity | 2026-02-18
Cities are heterogeneous ecological mosaics where infrastructure, habitat fragmentation, human activity, and evolutionary pressures interact to determine which species survive and adapt.
3. Promoting urban biodiversity for the benefit of people and nature
| Ingo Kowarik et al. | Nature Reviews Biodiversity | 2025-03-25
Urban biodiversity supports ecosystem services, climate resilience, health, recreation, and daily contact with nature, making biodiversity conservation an important part of city planning.
4. Urban biodiversity in the Anthropocene
| Mark C. Mainwaring, Guobao Song and Shuping Zhang | Scientific Reports | 2024-11-13
Reviews emerging urban biodiversity research involving wildlife distribution, trophic interactions, genetic change, pollution, artificial light, noise, and biodiversity-friendly infrastructure.
5. Shifting forward: Urban ecology in perspective
| Urban Ecology Special Section authors | Ambio | 2024-04-20
Argues that cities should be understood as ecosystems and that urban ecology must increasingly guide decisions concerning biodiversity, climate change, development, and human relationships with nature.
6. A transformative shift in urban ecology toward a more active and relevant future for the field and for cities
| Niki Frantzeskaki et al. | Ambio | 2024-04-20
Proposes moving urban ecology from studying nature inside cities toward actively applying ecological knowledge with communities, planners, and decision-makers.
7. Urban biodiversity, ecosystems and the city: Insights from 50 years of the Berlin School of urban ecology
| Ingo Kowarik et al. | Landscape and Urban Planning | 2023
Five decades of research in Berlin demonstrate how cities function as complex socio-ecological ecosystems containing novel habitats, spontaneous vegetation, native species, and introduced organisms.
8. Biodiversity in cities needs space: A meta-analysis of factors determining intra-urban biodiversity variation
| Joscha Beninde, Michael Veith and Axel Hochkirch | Ecology Letters | 2015
A meta-analysis covering numerous cities and taxa finds habitat area, ecological corridors, and vegetation structure among the strongest predictors of urban biodiversity.
9. A global analysis of the impacts of urbanization on bird and plant diversity reveals key anthropogenic drivers
| Myla F. J. Aronson et al. | Proceedings of the Royal Society B | 2014-04-07
A global comparison of cities finds major reductions in native bird and plant densities but also shows that cities continue to support substantial native biodiversity.
10. Urbanization as a major cause of biotic homogenization
| Michael L. McKinney | Biological Conservation | 2006-01
Explains how urbanization favors widespread urban-adapted organisms while eliminating many locally distinctive species, making biological communities increasingly similar among cities.
Planning, Design and Green Infrastructure
11. Understanding collaborative governance of biodiversity-inclusive urban planning
| Israa Mahmoud et al. | Urban Ecosystems | 2025-01-16
Develops criteria for evaluating urban nature plans, including biodiversity goals, governance, participation, financing, implementation, and ecological monitoring.
12. Urban biodiversity is affected by human-designed features of public squares
| Andrew J. Fairbairn et al. | Nature Cities | 2024-09-11
Research across 103 Munich squares shows that lawns, shrubs, trees, people, pets, artificial light, and other design features strongly influence different urban taxa.
13. Urban nature-based solutions planning for biodiversity outcomes: human, ecological, and artificial intelligence perspectives
| Veljko Prodanovic, Peter M. Bach and Milan Stojkovic | Urban Ecosystems | 2024-05-15
Integrates ecological knowledge, human priorities, and computational tools to improve the design and placement of urban nature-based solutions.
14. Engineering blue-green infrastructure for and with biodiversity in cities
| Kilian Perrelet et al. | npj Urban Sustainability | 2024-04-24
Shows how engineered ponds, wetlands, vegetation, drainage systems, and other blue-green infrastructure can simultaneously provide urban services and wildlife habitat.
15. Biodiverse residential development: A review of New Zealand policies and strategies for urban biodiversity
| Kamiya Varshney et al. | Urban Forestry & Urban Greening | 2024-04-01
Reviews how residential planning rules, policies, and design guidelines can either protect biodiversity or accelerate habitat loss as cities expand.
16. Wilding cities for biodiversity and people: A transdisciplinary framework
| Sébastien Bonthoux et al. | Biological Reviews | 2024-03-21
Explores allowing more spontaneous ecological processes and less intensive maintenance as a strategy for increasing biodiversity and people's connection to urban nature.
17. Integrating biodiversity as a non-human stakeholder within urban development
| Various researchers | Landscape and Urban Planning | 2023-04
Proposes explicitly treating wildlife and biodiversity as stakeholders or users when architects and planners design urban developments.
18. The contribution of constructed green infrastructure to urban biodiversity: A synthesis and meta-analysis
Finds that constructed green infrastructure generally supports greater biodiversity than conventional gray infrastructure and can sometimes approach natural habitat conditions.
19. Green Roofs and Green Walls for Biodiversity Conservation: A Contribution to Urban Connectivity?
| Flavie Mayrand and Philippe Clergeau | Sustainability | 2018-03-27
Reviews whether vegetated roofs and walls can function as habitat patches and stepping stones within three-dimensional urban ecological networks.
20. Urban Biodiversity and Landscape Ecology: Patterns, Processes and Planning
Reviews how landscape ecology can guide city planning through habitat protection, connectivity, vegetation management, and biodiversity-sensitive urban development.
Urban Parks, Green Spaces and Habitat Networks
21. Promoting avian diversity in cities requires multiple parks with variable features
| Frank A. La Sorte et al. | Nature Cities | 2026
Analysis of 935 parks in 186 U.S. cities shows that no single park design maximizes every dimension of bird diversity, favoring networks of parks with varied characteristics.
22. Invertebrate richness and diversity in parks situated along a gradient of urbanisation
| Lena K. McNaughton, Barbara I. P. Barratt and Yolanda van Heezik | Urban Ecosystems | 2025-05-19
Examines how increasing urbanization affects invertebrates and demonstrates the conservation value of well-designed urban parks.
23. The contribution of informal green space to urban biodiversity: a city-scale assessment using crowdsourced survey data
| Hugh R. Stanford et al. | Urban Ecosystems | 2024-11-05
Shows that informal green spaces in metropolitan Melbourne make substantial contributions to native bird and plant biodiversity.
24. Urban green spaces with high connectivity and complex vegetation promote occupancy and richness of birds in a tropical megacity
| Marco T. Oropeza-Sánchez et al. | Urban Ecosystems | 2024-10-17
Finds that connected green spaces containing structurally complex vegetation support more urban bird species in a tropical megacity.
25. Transdisciplinary approaches assessing unmanaged urban green spaces reveal benefits for biodiversity and people
| Kristine Engemann et al. | Socio-Ecological Practice Research | 2024-06-05
Finds that unmanaged and semi-wild urban spaces can provide ecological and social benefits that conventional maintenance practices may overlook.
26. Discovering urban nature: citizen science and biodiversity on a university campus
| Patrícia Tiago et al. | Urban Ecosystems | 2024-04-02
Demonstrates how university campuses can serve as biodiversity refuges while citizen scientists provide useful data about urban species.
27. Urban park qualities driving visitors mental well-being and wildlife conservation in a Neotropical megacity
| Jéssica Francine Felappi et al. | Scientific Reports | 2024-02-28
Demonstrates that urban parks can simultaneously contribute to psychological well-being and wildlife conservation when ecological quality is incorporated into management.
28. Historical park planning is associated with modern-day patterns of bird diversity in cities
| Dan Herrera et al. | Landscape and Urban Planning | 2024
Historical patterns of park creation continue to influence contemporary bird richness and functional diversity in American cities.
29. Urban bird diversity: does abundance and richness vary unexpectedly with green space attributes?
| Rebecca Thompson, Mariana Tamayo and Snorri Sigurðsson | Journal of Urban Ecology | 2022-09-22
Research in Reykjavík shows that bird abundance and species richness respond differently to park size, age, setting, and vegetation.
30. Species richness in urban parks and its drivers: A review of empirical evidence
| Anders Busse Nielsen et al. | Urban Ecosystems | 2014
Reviews dozens of studies and finds urban parks frequently rank among the most species-rich types of green space within cities.
Urban Forests, Street Trees and Residential Vegetation
31. Urban wildlife gardeners successfully support native bees in their backyards
| Julian Brown et al. | Urban Ecosystems | 2026-04-28
Wildlife-oriented residential gardens support more specialist native bees and can strengthen habitat networks when combined with remnant natural areas.
32. Global Urban Tree Species (GUTS): Revealing tree species diversity across the world's urban areas
| Xudong Yang et al. | Scientific Data | 2026-02-19
A global urban-tree database documents more than 10,000 tree species across thousands of cities and provides a major resource for studying urban forest biodiversity.
33. The Role of Urban Tree Areas for Biodiversity Conservation in Degraded Urban Landscapes
| Sonja Jovanović et al. | Land | 2025
Examines how urban tree areas can function as biodiversity reservoirs while improving ecological resilience in intensively modified landscapes.
34. Plant native: comparing biodiversity benefits, ecosystem services provisioning, and plant performance of native and non-native plants in urban horticulture
| Elena S. Tartaglia and Myla F. J. Aronson | Urban Ecosystems | 2024-09-26
Reviews evidence surrounding native and non-native horticultural plants and argues for greater integration of native species into biodiversity-oriented urban landscapes.
35. Urban greening with shrubs can supercharge invertebrate abundance and diversity
| Mahmuda Sharmin et al. | Scientific Reports | 2024-04-16
Adding shrubs to urban landscapes dramatically increases habitat complexity and can substantially increase invertebrate abundance and diversity.
36. Street tree communities reflect socioeconomic inequalities and legacy effects of colonial planning in Nairobi, Kenya
| Alice Gerow et al. | Urban Forestry & Urban Greening | 2024
Nairobi's street trees reveal striking socioeconomic disparities in tree abundance and diversity as well as persistent effects of colonial-era urban planning.
37. Are street trees friendly to biodiversity?
| J. Liu et al. | Landscape and Urban Planning | 2022-02
Analysis of street-tree inventories from 59 Chinese cities finds widespread dominance by a limited number of species and highlights the value of native trees.
38. The importance of street trees to urban avifauna
| Eric M. Wood et al. | Ecological Applications | 2020
Research in Los Angeles shows that street-tree composition and socioeconomic inequality strongly affect the abundance and distribution of foraging birds.
39. Street trees reduce the negative effects of urbanization on birds
| João Carlos de Castro Pena et al. | PLOS ONE | 2017-03-23
Larger trees, native species, greater tree richness, and better canopy structure can partially buffer urban birds from noise and intensive development.
40. Urban domestic gardens (IX): Composition and richness of the vascular plant flora, and implications for native biodiversity
| Ken Thompson et al. | Biological Conservation | 2006
Detailed surveys of residential gardens show that private yards collectively contain remarkably rich cultivated and spontaneous plant communities.
Bees, Butterflies and Urban Pollinators
41. Citizen science helps reveal how urban land management shapes butterfly communities
| A. Büermann et al. | Basic and Applied Ecology | 2026-06
Citizen-science surveys in Leipzig show that lower built cover, shrubs, flower strips, and reduced mowing can improve butterfly abundance and richness.
42. Urban landscapes with more natural greenspace support higher pollinator diversity
| Jens Ulrich and Risa D. Sargent | Ecological Applications | 2025-02-19
Urban landscapes containing greater amounts of natural or semi-natural green space support more diverse pollinator communities.
43. Impact of urban landscape patterns on butterfly diversity in Fuzhou City parks
| Ying Lin et al. | Science of the Total Environment | 2024-12-20
Surveys of 24 parks find that woodland, grassland, development patterns, and landscape structure affect different butterfly ecological groups in different ways.
44. Bee-friendly interventions: the barriers and opportunities affecting urban residents' conservation of wild bees in gardens
Examines what encourages or prevents residents from adopting garden practices that provide food, nesting habitat, and protection for wild bees.
45. The value of pocket parks in preserving urban butterfly diversity
| Zhang et al. | Urban Forestry & Urban Greening | 2024-09
Small pocket parks can provide butterfly habitat and stepping stones, particularly when they contain nectar plants, host plants, and biodiversity-sensitive management.
46. Adding a mosaic mowing regime to urban lawns is the key to city biodiversity management for pollinators
| Patrik Rada, Petr Bogusch, Jiří Rom and Jakub Horák | Urban Forestry & Urban Greening | 2024-09
Leaving portions of lawns temporarily unmown increases flowering resources and creates habitat for diverse pollinators, including threatened species.
47. Assessing five decades of garden bee studies
| Nicole C. S. Bell et al. | Frontiers in Sustainable Cities | 2023-10-30
A global review shows that urban gardens can sustain hundreds of bee species while revealing important geographic gaps in pollinator research.
48. How city traits affect taxonomic and functional diversity of urban wild bee communities: insights from a worldwide analysis
| Andrea Ferrari and Carlo Polidori | Apidologie | 2022-08-09
A worldwide comparison links urban form, fragmentation, impervious surfaces, and city characteristics to the composition and functional traits of wild bee communities.
49. Urban native vegetation remnants support more diverse native bee communities than residential gardens in Australia's southwest biodiversity hotspot
| Kit S. Prendergast et al. | Biological Conservation | 2022-01
Native vegetation remnants contain richer and more specialized native-bee assemblages than gardens, demonstrating the importance of protecting remaining natural habitat.
50. Small scale additions of native plants fail to increase beneficial insect richness in urban gardens
| Kevin C. Matteson and Gail A. Langellotto | Insect Conservation and Diversity | 2011
An urban-garden experiment shows that simply adding small patches of native flowers does not automatically increase insect richness, emphasizing the importance of habitat scale and context.
Insects, Lawns, Green Roofs and Green Walls
51. Urban biodiversity in green walls: Plant diversity and flower cover as drivers of pollinator abundance in vertical greening systems
| Leonie K. Fischer et al. | Urban Forestry & Urban Greening | 2026-08
Surveys of vertical gardens find that plant richness and flower abundance strongly influence several pollinator groups, demonstrating the biodiversity potential of building façades.
52. Invertebrate biodiversity is greater in urban sites with nature-based solutions than control sites: A cross-continental study
| Tom Wild et al. | Urban Forestry & Urban Greening | 2026-05
Cross-continental comparisons show that nature-based urban infrastructure can support richer and more abundant invertebrate communities than conventional sites.
53. Drivers of arthropod biodiversity in an urban ecosystem
| Jayme M. M. Lewthwaite et al. | Scientific Reports | 2024-01-03
Large-scale sampling reveals how vegetation, urban form, environmental characteristics, and local habitat conditions structure highly diverse arthropod communities in cities.
54. Urban insect bioarks of the 21st century
| Sarah E. Diamond, Giulia Bellino and G. G. Deme | Current Opinion in Insect Science | 2023-06
Reviews the capacity of cities to act as refuges or "bioarks" for insects when habitat design and management counteract the pressures of urbanization.
55. Green roofs and pollinators, useful green spots for some wild bee species, but not so much for hoverflies
| Jeffrey Jacobs, Natalie Beenaerts and Tom Artois | Scientific Reports | 2023-01-26
Finds that green roofs can be useful habitat for certain urban wild bees while their benefits are much more limited for hoverflies.
56. Urban green roofs can support a diversity of parasitoid wasps
| Aramee C. Diethelm and Susan E. Masta | Frontiers in Ecology and Evolution | 2022-12-06
More structurally and botanically diverse green roofs support richer parasitoid-wasp communities that may contribute to ecological pest regulation.
57. Urban green roofs promote metropolitan biodiversity: A comparative case study
| E. I. F. Wooster et al. | Building and Environment | 2022-01
A Sydney green roof supported substantially greater bird, arthropod, and gastropod diversity than a nearby conventional roof.
58. Partial mowing of urban lawns supports higher abundances and diversities of insects
| Jennifer Wintergerst et al. | Journal of Insect Conservation | 2021-09-06
Reduced and partial mowing increases insect biomass, species richness, abundance, and evidence of reproduction compared with intensively mown lawns.
59. Local habitat factors and spatial connectivity jointly shape an urban insect community
| Anna E. Barr et al. | Landscape and Urban Planning | 2021
Shows that local habitat characteristics such as leaf litter work together with landscape connectivity to maintain urban insect communities.
60. Urban green roofs provide habitat for migrating and breeding birds and their arthropod prey
| Dustin R. Partridge and J. Alan Clark | PLOS ONE | 2018-08-29
New York green roofs supported greater bird and arthropod richness and provided feeding and stopover habitat for breeding and migratory birds.
Urban Ponds, Streams, Cemeteries and Vacant Land
61. What role can cemeteries play in conserving plant biodiversity in different urbanisation contexts?
| Jeanne Vallet et al. | Urban Ecosystems | 2026-04-09
Surveys hundreds of cemeteries and finds substantial spontaneous plant diversity, including species of conservation concern.
62. Effects of urbanisation, habitat characteristics, and management on garden pond biodiversity: Findings from a large-scale citizen science survey
| Márton et al. | Landscape and Urban Planning | 2025
A survey of more than 800 Hungarian garden ponds finds that pond size, age, vegetation, urbanization, and practices such as algaecide use influence amphibians, dragonflies, and birds.
63. Life on Green Patches: Diversity and Seasonal Changes of Butterfly Communities Associated With Wastelands of the Post-Industrial Central European City
| Sylwia Pietrzak and Krzysztof Pabis | Ecology and Evolution | 2024-12-16
Post-industrial wastelands in Łódź support diverse and relatively stable butterfly assemblages because heterogeneous spontaneous vegetation creates numerous microhabitats.
64. The overlooked margins: how cities impact diversity of plants and terrestrial invertebrates along urban streams
| Carolina Oliveira Campos et al. | Urban Ecosystems | 2024-04-26
Stream margins in Coimbra support surprisingly rich plant and terrestrial-invertebrate communities whose composition changes along urbanization gradients.
65. Assessing the conservation value of cemeteries to urban biota worldwide
| Yuval Itescu and Jonathan M. Jeschke | Conservation Biology | 2024
A global synthesis of cemetery biodiversity finds that these culturally protected green spaces often have conservation value comparable to urban parks.
66. The importance of blue and green landscape connectivity for biodiversity in urban ponds
| Chaz Hyseni et al. | Basic and Applied Ecology | 2021
Demonstrates that connectivity among ponds and surrounding green habitats can be more important to aquatic invertebrate communities than some local pond characteristics.
67. Cemeteries support avian diversity likewise urban parks in European cities
| Federico Morelli et al. | Urban Forestry & Urban Greening | 2018-12
Surveys across four European countries show that cemeteries can support bird taxonomic, functional, and evolutionary diversity at levels comparable to parks.
68. Balancing Urban Biodiversity Needs and Resident Preferences for Vacant Lot Management
| Christine C. Rega-Brodsky, Charles H. Nilon and Paige S. Warren | Sustainability | 2018-05-22
Baltimore vacant lots containing remnant and planted vegetation can provide bird and plant habitat while management choices strongly affect neighborhood acceptance.
69. Urban ponds as an aquatic biodiversity resource in modified landscapes
| Matthew J. Hill et al. | Global Change Biology | 2017
Finds that urban ponds can contribute substantially to freshwater biodiversity and should be incorporated into city-scale conservation networks.
70. The ecology and biodiversity of urban ponds
| Christopher Hassall | WIREs Water | 2014-01-14
Reviews urban ponds as networks of freshwater habitats capable of supporting significant biodiversity despite pollution, invasive species, and intensive management.
Urban Birds, Mammals and Other Vertebrates
71. Trophic downgrading in the city: urban structural simplification erodes the snake component of reptile assemblages
| Leonardo Vignoli and Luca Luiselli | Urban Ecosystems | 2026-08-15
Urban habitat simplification disproportionately reduces snakes and alters the trophic structure of reptile communities.
72. Bird community responses to urbanization and vegetation parameters across the city of Salzburg, Austria
| Beate A. Apfelbeck et al. | Urban Ecosystems | 2025-05-28
Bird richness declines as building cover increases but improves locally where cities retain grass, trees, and especially native tree species.
73. Urban gradient resolution matters! Avian diversity patterns in a boreal green city
| Michelle García-Arroyo et al. | Urban Ecosystems | 2025-02-08
Research in Lahti, Finland shows that the ecological effects of urbanization can be hidden when urban gradients are measured too coarsely.
74. Impact of urban environmental matrices on bird diversity: Mediating effects and ecological thresholds
| Haoran Yu, Hanwen Xiao and Xinchen Gu | Applied Geography | 2025-01
Uses citizen-science and environmental data to identify important thresholds and habitat characteristics for bird-friendly urban planning.
75. Role of urban parks in supporting bat communities under accelerating urbanization
Examines how urban parks can provide feeding and roosting habitat for bats and emphasizes their role in maintaining mammal diversity within rapidly growing cities.
76. Urbanization drives biotic homogenization of the avian community in China
| Jiewen Deng et al. | Integrative Zoology | 2024-02-20
A nationwide analysis finds that urbanization reduces distinctions among Chinese bird communities by favoring similar sets of urban-tolerant species.
77. Urbanization, climate and species traits shape mammal communities from local to continental scales
| Jeffrey D. Haight et al. | Nature Ecology & Evolution | 2023-09-04
Camera data from 20 North American cities show that climate, vegetation, body size, and urbanization jointly determine how mammal communities respond to cities.
78. Urbanization causes biotic homogenization of woodland bird communities at multiple spatial scales
| William Sidemo-Holm et al. | Global Change Biology | 2022-08-14
Shows that urbanization can make woodland bird communities poorer and increasingly similar even when the woodland habitat itself remains relatively intact.
79. Urban noise and surrounding city morphology influence green space occupancy by native birds in a Mediterranean-type South American metropolis
| Constanza Arévalo et al. | Scientific Reports | 2022-03-16
Demonstrates that noise pollution and the form of surrounding development influence whether native birds occupy urban green spaces.
80. Designing wildlife-inclusive cities that support human-animal co-existence
| Beate Apfelbeck et al. | Landscape and Urban Planning | 2020-08
Proposes integrating wildlife requirements directly into architectural and urban-design processes instead of treating wildlife conservation as an afterthought.
Urban Plants, Spiders and Other Biodiversity
81. Sacred sites as refuges for native plant diversity in an urbanized tropical landscape
| Luc Schmid et al. | Nature Cities | 2026-07-24
Surveys more than 25,000 woody plants in Antananarivo and finds that sacred and remnant vegetation patches can preserve native tropical plant diversity within an expanding city.
82. Urban Spider Assemblages in a Neotropical City: Diversity, Functional Composition, and Introduced Species in Public Parks of Chetumal, Mexico
| Juan M. Noh Gomez et al. | Diversity | 2026
Surveys 20 tropical urban parks and documents 167 spider species representing numerous ecological guilds, including both native and introduced species.
83. Impact of Urban Greenspace Pattern Dynamics on Plant Diversity: A Case Study in Yangzhou, China
| Hui Li et al. | Sustainability | 2025-06-12
Links changes in green-space fragmentation and spatial configuration with plant diversity, offering guidance for biodiversity-oriented urban landscape planning.
84. Effects of Urban Park Construction Period on Plant Multidimensional Diversities, Landscape Patterns of Green Spaces, and Their Associations in Changchun City
| Xiao Yao et al. | Land | 2025-03-22
Shows that parks built in different historical periods contain distinct patterns of taxonomic, structural, and phylogenetic plant diversity.
85. City as a filter: urban density affects taxonomic and functional diversity of foliage dwelling spiders
| Anna Piquet et al. | Landscape Ecology | 2024-12-19
Shows that increasing urban density acts as an ecological filter that alters both spider species composition and functional traits.
86. Impacts of urban land-cover on plant community structure and biodiversity in a multi-use landscape
| Liane Miedema Brown and Madhur Anand | Landscape Ecology | 2024-11-16
Demonstrates how urban land-cover patterns alter plant-community composition and biodiversity across a landscape containing multiple human land uses.
87. Characterizing composition profile and diversity patterns of spontaneous urban plants across China's major cities
| Siwei Hu et al. | Journal of Environmental Management | 2022-09-01
A synthesis of 59 Chinese cities identifies more than 1,200 spontaneous urban plant species and reveals climatic, economic, and biogeographic influences on their distribution.
88. Urban growth and topographical factors shape patterns of spontaneous plant community diversity in a mountainous city in southwest China
| Shenhua Qian et al. | Urban Forestry & Urban Greening | 2020-11
Surveys in Chongqing document hundreds of spontaneous plant species and show how urban intensity, habitat quality, and mountainous topography structure urban flora.
89. Local and landscape-scale environmental filters drive the functional diversity and taxonomic composition of spiders across urban greenspaces
| Yvan A. Delgado de la Flor et al. | Journal of Applied Ecology | 2020-04-13
Experiments in Cleveland vacant lots and urban meadows demonstrate that both local habitat design and surrounding landscape affect spider communities.
90. Three categories of urban green areas and the effect of their different management on the communities of ants, spiders and harvestmen
| Wojciech Czechowski et al. | Urban Ecosystems | 2020
Comparisons of botanical gardens, parks, and urban woodlands show that green-space management strongly influences arthropod community composition.
Biodiversity, People, Equity, Governance and Monitoring
91. More than just green: the role of vegetation heterogeneity for species richness and multidiversity in urban green spaces
| Giulia Casciano, Janine Bolliger and Achilleas Psomas | Urban Ecosystems | 2026-08-17
Research across four Swiss cities shows that urban biodiversity depends not simply on the quantity of green space but on variation in vegetation height, structure, and habitat complexity.
92. Assessing urban biodiversity patterns using citizen science data and a hierarchical urban habitat analysis
| Torben Schubert, Angela Hof and Peter Kaufmann | Urban Ecosystems | 2026-04-24
Combines citizen-science observations with hierarchical habitat classification to reveal biodiversity patterns that can support urban planning and monitoring.
93. How do nature-based solutions contribute to biodiversity in cities?
A global review of 185 nature-based-solution cases in 87 cities finds predominantly positive biodiversity outcomes while identifying major gaps in baseline monitoring and taxonomic coverage.
94. Urban community gardens foster positive human-avian interactions across an income gradient in San Francisco
| Kelley E. Langhans et al. | Landscape and Urban Planning | 2025-05-06
Study of 20 San Francisco community gardens finds that gardens can support birds and positive human-wildlife interactions across neighborhoods with different income levels.
95. Biodiversity of urban green spaces and human health: a systematic review of recent research
| C.-C. Wu, J. O'Keefe, Y. Ding and W. C. Sullivan | Frontiers in Ecology and Evolution | 2024-11-25
Reviews evidence connecting biologically diverse urban green spaces with psychological health, well-being, nature experience, and environmental quality.
96. Urban Cemeteries as Shared Habitats for People and Nature
| Tanja M. Straka, Maren Mischo, Konstantin J. S. Petrick and Ingo Kowarik | Land | 2022-08-04
Shows how cemeteries can simultaneously provide biodiversity habitat, cultural landscapes, nature experiences, recreation, and psychologically comforting environments.
97. Contested urban spaces in unplanned urbanization: Wetlands under siege
| Patrick Brandful Cobbinah et al. | Cities | 2022-02
Examines how rapid and poorly planned urban development can destroy wetlands when their ecological value is neglected in governance and land-use decisions.
98. Accessibility disturbances to the biodiversity of urban wetlands due to built environment
| Carolina Rojas et al. | City and Environment Interactions | 2022-01
Demonstrates how roads, buildings, accessibility, and urban development around wetlands influence native and introduced plant communities.
99. Nature-based solutions for urban biodiversity governance
| Linjun Xie and Harriet Bulkeley | Environmental Science & Policy | 2020-08
Analysis of nearly 200 European nature-based projects shows how cities use conservation, restoration, and ecosystem-service goals to incorporate biodiversity into governance.
100. Urban socioeconomic inequality and biodiversity often converge, but not always: A global meta-analysis
| Evan R. Kuras et al. | Landscape and Urban Planning | 2020-06
Analysis of 84 cases across 34 cities finds that wealthier neighborhoods often contain greater biodiversity but that urban form, disturbance, policy, and community preferences can alter the pattern.
Urban Biodiversity: Global Patterns, Conservation and Research
101. Community-scale biodiversity conservation in cities
| Urban biodiversity researchers | BioScience | 2025
Argues that conservation should extend beyond isolated urban parks toward biodiversity measures embedded throughout neighborhoods and everyday urban landscapes.
102. Conserving urban biodiversity: Current practice, barriers, and enablers
| Kylie Soanes et al. | Conservation Letters | 2023
Interviews with urban environmental managers reveal hundreds of conservation actions and identify institutional, social, financial, and ecological barriers to implementation.
103. Cities as sanctuaries
Proposes viewing cities as potential biodiversity sanctuaries capable of protecting habitats and species while giving millions of people opportunities to experience nature.
104. Research Agenda for Urban Biodiversity in the Global Extinction Crisis
| Sonja Knapp et al. | BioScience | 2021
Establishes major research priorities involving urban refuges, technological change, ecosystem services, social drivers, ecological networks, and changing species communities.
105. Urbanization drives cross-taxon declines in abundance and diversity at multiple spatial scales
| Elena Piano et al. | Global Change Biology | 2020
Research across numerous terrestrial and aquatic invertebrate groups finds that urbanization generally reduces abundance and species richness, although responses vary among taxa and spatial scales.
106. Research gaps in knowledge of the impact of urban growth on biodiversity
| Robert I. McDonald et al. | Nature Sustainability | 2020
A global review identifies major geographic and scientific gaps in research on the direct and indirect effects of urban expansion on biodiversity.
107. When cities are the last chance for saving species
| Kylie Soanes and Pia E. Lentini | Frontiers in Ecology and the Environment | 2019
Identifies species whose continued survival depends heavily on conservation actions within cities and towns.
108. Direct and indirect loss of natural area from urban expansion
| Jasper van Vliet | Nature Sustainability | 2019
Urban expansion destroys habitat directly while also generating much larger indirect losses by displacing agriculture into forests and other natural ecosystems.
109. Cities are hotspots for threatened species
| Christopher D. Ives et al. | Global Ecology and Biogeography | 2016
Analysis of Australian cities finds disproportionately high numbers of nationally threatened plants and animals within urban areas.
110. Motivations for conserving urban biodiversity
| Donald C. Dearborn and Salit Kark | Conservation Biology | 2010
Describes seven major reasons for urban biodiversity conservation, including threatened-species protection, ecosystem services, education, ethics, and human well-being.
Urbanization, Community Assembly and Functional Diversity
111. Urbanisation generates multiple trait syndromes for terrestrial animal taxa worldwide
| Amy K. Hahs et al. | Nature Communications | 2023
Data from 379 cities show that urbanization filters animal communities according to traits involving mobility, reproduction, feeding, specialization, and body size.
112. The landscape ecological view of vertebrate species richness in urban areas across biogeographic realms
| Chun-Wei Huang, Jia Qing Ooi and Si Ying Yau | Scientific Reports | 2023
Examines how the amount and configuration of green habitat influence vertebrate richness across cities in different parts of the world.
113. Status of urban ecology in Africa: A systematic review
| Adeola G. Awoyemi and Juan Diego Ibáñez-Álamo | Landscape and Urban Planning | 2023
Reviews hundreds of African urban-ecology studies and documents major geographic and taxonomic knowledge gaps across the rapidly urbanizing continent.
114. Detecting patterns of vertebrate biodiversity across the multidimensional urban landscape
| Marina Alberti and Tianzhe Wang | Ecology Letters | 2022
Analysis across 100 U.S. metropolitan areas shows that urban biodiversity patterns emerge from interactions among ecological heterogeneity, connectivity, social conditions, and history.
115. Global trends in urban wildlife ecology and conservation
| Sarah B. Magle and colleagues | Biological Conservation | 2021
A systematic review finds rapid growth in urban-wildlife research but persistent geographic and taxonomic biases toward North America, Europe, mammals, and birds.
116. The phylogenetic and functional diversity of regional breeding bird assemblages is reduced and constricted through urbanization
| Frank A. La Sorte et al. | Diversity and Distributions | 2018
Comparison of 58 cities finds urban bird communities contain less evolutionary and functional diversity than their surrounding regional species pools.
117. Hierarchical filters determine community assembly of urban species pools
| Myla F. J. Aronson et al. | Ecology | 2016
Shows how regional geography, urbanization, habitat characteristics, and human management interact as filters determining which species establish in cities.
118. A landscape ecology approach identifies important drivers of urban biodiversity
| Tabea Turrini and Eva Knop | Global Change Biology | 2015
Multi-city research shows how local habitat quality and surrounding landscape structure combine to influence urban arthropod diversity.
119. Time for a change: dynamic urban ecology
| Erik K. B. H. et al. | Trends in Ecology & Evolution | 2012
Argues that ecological studies must account for the changing spatial and temporal dynamics of cities rather than treating urbanization as a static condition.
120. Scaling up from gardens: biodiversity conservation in urban environments
| Mark A. Goddard, Andrew J. Dougill and Tim G. Benton | Trends in Ecology & Evolution | 2010
Shows how networks of private gardens can collectively provide substantial biodiversity habitat when conservation is coordinated beyond individual properties.
Urban Soils, Microbes and Belowground Biodiversity
121. Human traffic intensity alters the soil microbial community composition, diversity, and structure in subtropical urban green spaces
| Soil microbial ecology researchers | Applied Soil Ecology | 2026
Heavy recreational use reduces microbial diversity and changes bacterial and fungal community structure in forests, parks, greenbelts, and wetlands.
122. The boreal soil microbiome of different urban green spaces – Do city residents meet different microbes?
| Urban microbiome researchers | Urban Forestry & Urban Greening | 2025
Finds highly diverse soil microbiomes across urban forests and other green spaces, with vegetation and soil chemistry strongly shaping microbial communities.
123. Inter- and intra-site variation of microarthropod communities in urban parks
| Urban soil fauna researchers | Zoologischer Anzeiger | 2025
Shows that park age, fragmentation, patch size, soil chemistry, and management generate substantial differences in urban microarthropod communities.
124. Soil meso- and microfauna community acts as an environmental bioindicator in urban greenway landscapes
| Urban soil researchers | Geoderma | 2024
Wider greenways, diverse tree layers, deciduous vegetation, and suitable soil moisture support richer communities of soil microarthropods and other fauna.
125. Soil animal communities demonstrate simplification without homogenization along an urban gradient
| Soil ecology researchers | Urban Ecosystems | 2024
Increasing urbanization reduces soil-animal richness and abundance while creating distinctive rather than uniformly homogenized belowground communities.
126. Soil biodiversity supports the delivery of multiple ecosystem functions in urban greenspaces
| Manuel Delgado-Baquerizo et al. | Nature Ecology & Evolution | 2023
A six-continent study finds that diverse soil bacteria, fungi, protists, and invertebrates underpin numerous ecosystem functions within urban green spaces.
127. Degree of urbanization and vegetation type shape soil biodiversity in city parks
| Urban soil biodiversity researchers | Science of the Total Environment | 2023
Environmental-DNA surveys show that urbanization and vegetation structure alter diverse belowground organisms, with complex vegetation helping stabilize soil communities.
128. Biodiversity maintains soil multifunctionality and soil organic carbon in novel urban ecosystems
| Christina Schittko et al. | Journal of Ecology | 2022
Greater plant and soil-fauna diversity increases soil multifunctionality and organic-carbon storage in novel urban grassland ecosystems.
129. Direct and indirect effects of urban gardening on aboveground and belowground diversity influencing soil multifunctionality
| Monika Egerer et al. | Scientific Reports | 2019
Diverse vegetation and less intensive gardening practices such as composting, mulching, and reduced tillage can strengthen soil biodiversity and ecosystem functioning.
130. The effect of urban park landscapes on soil Collembola diversity: A Mediterranean case study
| Soil ecology researchers | Landscape and Urban Planning | 2018
Diverse park landscapes and woody vegetation increase habitat heterogeneity and ecological niches for springtail communities.
Amphibians, Reptiles, Bats and Mammals
131. Urban–Wild Interface Diversity: A Comprehensive Checklist of Herpetofauna of Guayaquil, Ecuador
| Cruz-García et al. | Ecology and Evolution | 2026
Seventeen years of observations document dozens of amphibian and reptile species occupying remnant forests and urbanized habitats in Guayaquil.
132. Urban habitat use by bats at species and community levels across multiple spatial scales
| Fabrizio Gili et al. | Urban Ecosystems | 2026
Demonstrates that bat species respond to habitat conditions at multiple spatial scales, highlighting the need for connected urban habitat networks.
133. Diversity and conservation status of amphibians and reptiles in cities: a country-level approach using citizen science
| David Álvarez and colleagues | European Journal of Wildlife Research | 2026
Citizen-science records from 32 Spanish cities reveal substantial native herpetofauna alongside numerous introduced amphibian and reptile species.
134. Amphibian and reptile diversity and landscape connectivity in the Central Andes of Colombia: a Local Climate Zones approach
| Héctor F. Arias-Monsalve et al. | Urban Ecosystems | 2026
Surveys in Manizales demonstrate the importance of green areas and landscape connectivity for maintaining tropical urban amphibians and reptiles.
135. Spatial and habitat determinants of small-mammal biodiversity in urban green areas: Lessons for nature-based solutions
| Urban mammal researchers | Urban Forestry & Urban Greening | 2025
Local vegetation quality and city-scale connectivity emerge as important factors for maintaining diverse small-mammal communities.
136. No city for wetland species: habitat associations affect mammal persistence in urban areas
| Leonardo Ancillotto et al. | Proceedings of the Royal Society B | 2024
Shows that mammals dependent on wetlands and specialized habitats are disproportionately vulnerable to urban development.
137. Changes in reptile and amphibian communities across urbanization gradients in eastern North America
| Urban herpetology researchers | Global Ecology and Conservation | 2023
Community-science data from 17 cities show moderate reductions in reptile and amphibian richness, especially among habitat specialists.
138. A global analysis of urbanization effects on amphibian richness: Patterns and drivers
| L. Yang, S. Zhao and S. Liu | Global Environmental Change | 2022
Global analysis explores how climate and urbanization interact to produce geographically variable changes in amphibian species richness.
139. Male and female bats differ in their use of a large urban park
| Cylita Guy, Krista J. Patriquin and John M. Ratcliffe | Journal of Urban Ecology | 2019
Sex-specific patterns of habitat use show that urban parks may provide different resources for male and female bats.
140. Urban forests sustain diverse carrion beetle assemblages in the New York City metropolitan area
| Urban entomology researchers | PeerJ | 2017
Forested parks across metropolitan New York retain diverse carrion-beetle communities and the decomposition functions associated with them.
Pollinators, Butterflies and Urban Insects
141. Neither source nor trap: Urban gardens as habitat for nonmigratory monarch butterflies in Northern California
| E. Erickson | Ecosphere | 2025
Evaluates whether urban gardens supporting winter-breeding monarch butterflies function as productive habitat, demographic sinks, or ecological traps.
142. Winners and losers at enhanced urban roadsides: Trait-based structuring of wild bee communities at local and landscape scale
| Urban bee researchers | Biological Conservation | 2024
Native wildflower enhancement along roads increases bee diversity while revealing which ecological traits make species especially vulnerable to urban filtering.
143. Decline in wild bee species richness associated with honey bee abundance in an urban ecosystem
| Gail MacInnis, Etienne Normandin and Carly D. Ziter | PeerJ | 2023
Montréal surveys associate high densities of managed honey bees with lower wild-bee richness and reduced pollen availability.
144. Botanical Gardens Are Local Hotspots for Urban Butterflies in Arid Environments
| Butterfly conservation researchers | Insects | 2022
Botanical gardens in arid southwestern U.S. cities contain disproportionately rich butterfly communities compared with surrounding urban landscapes.
145. Wild bees in urban grasslands: Urbanisation, functional diversity and species traits
| Sascha Buchholz et al. | Landscape and Urban Planning | 2020
Berlin grasslands support functionally diverse bees, while isolation and low flower cover reduce their conservation value.
146. Urban fragmentation leads to lower floral diversity, with knock-on impacts on bee biodiversity
| Panagiotis Theodorou et al. | Scientific Reports | 2020
Fragmentation reduces flowering-plant diversity and abundance, producing cascading effects on wild-bee communities.
147. Urban areas as hotspots for bees and pollination but not a panacea for all insects
| Panagiotis Theodorou et al. | Nature Communications | 2020
Cities can support unusually rich bee communities and strong pollination services even while other insect groups decline with urbanization.
148. Ring roads and urban biodiversity: distribution of butterflies in urban parks in Beijing city and correlations with other indicator species
| Beijing butterfly researchers | Scientific Reports | 2019
Butterfly richness increases toward Beijing's urban edge, demonstrating how metropolitan structure and distance from the city center affect insect communities.
149. Landscape and local site variables differentially influence pollinators and pollination services in urban agricultural sites
| Alison B. Bennett and Sarah Lovell | PLOS ONE | 2019
Urban farms demonstrate that local flower resources and surrounding landscape conditions affect pollinators and crop pollination in different ways.
150. City parks vs. natural areas – is it possible to preserve a natural level of bee richness and abundance in a city park?
| Urban pollinator researchers | Urban Ecosystems | 2018
Large and diverse city parks can support wild-bee richness and abundance approaching levels recorded in nearby natural habitats.
Management, Mowing and Habitat Complexity
151. The association between maintenance and biodiversity in urban green spaces: A review
| X. Hu and M. F. Lima | Landscape and Urban Planning | 2024
Review of 92 studies finds repeated evidence that intensive mowing and chemical inputs can reduce plant and animal diversity.
152. Ecological restoration and biodiversity-friendly management of urban grasslands – A global review on the current state of knowledge
| Renata Fekete et al. | Journal of Environmental Management | 2024
Reviews restoration approaches and recommends lower mowing, native seeding, protection of spontaneous vegetation, and interconnected grassland networks.
153. Large positive ecological changes of small urban greening actions
| Luis Mata et al. | Ecological Solutions and Evidence | 2023
A small Melbourne greening project produced rapid increases in insect richness, colonization, survival, and plant-insect network complexity.
154. Impact of mowing frequency on arthropod abundance and diversity in urban habitats: A meta-analysis
| A. Proske, S. Lokatis and J. Rolff | Urban Forestry & Urban Greening | 2022
Meta-analysis finds that reducing mowing substantially increases urban arthropod abundance and taxonomic richness.
155. A conceptual framework for urban ecological restoration and rehabilitation
| Valentin H. Klaus and Kathrin Kiehl | Basic and Applied Ecology | 2021
Develops restoration principles specifically suited to novel, hybrid, and heavily modified urban ecosystems where historical reference conditions may be unrealistic.
156. Dead tree branches in urban forests and private gardens are key habitat components for woodpeckers in a city matrix
| Arkadiusz Fröhlich and Michał Ciach | Landscape and Urban Planning | 2020
Retaining large trees, snags, and dead branches increases habitat quality for woodpeckers and other organisms dependent on old and decaying wood.
157. Intensive management reduces butterfly diversity over time in urban green spaces
| Guillermo Aguilera et al. | Urban Ecosystems | 2019
Long-term surveys in Malmö show greater butterfly losses in intensively managed parks than in semi-natural grasslands and ruderal spaces.
158. Increasing biodiversity in urban green spaces through simple vegetation interventions
| Caragh G. Threlfall et al. | Journal of Applied Ecology | 2017
Increasing native vegetation and understory complexity substantially improves habitat occupancy for birds, bats, bees, beetles, and bugs.
159. Reduced availability of habitat structures in urban landscapes: Implications for policy and practice
| David S. Le Roux et al. | Landscape and Urban Planning | 2014
Urban landscapes contain fewer shrubs, old trees, logs, and other habitat structures than conservation reserves, limiting resources needed by wildlife.
160. Creating novel urban grasslands by reintroducing native species in wasteland vegetation
| Leonie K. Fischer et al. | Biological Conservation | 2013
Demonstrates that native grassland species can be successfully reintroduced into altered urban wastelands to create low-maintenance biodiversity habitat.
Wastelands, Wild Spaces and Spontaneous Nature
161. Mapping wild nature areas to identify priority areas for urban rewilding in cities: A process-oriented approach
Satellite imagery and vegetation-management data are used to map wild areas and identify opportunities for rewilding densely developed parts of Vienna.
162. Integrating spontaneous urban woodlands into the green infrastructure: Unexploited opportunities for urban regeneration
| Giovanni Trentanovi et al. | Land Use Policy | 2021
Spontaneously developing woodlands on abandoned urban land can provide biodiversity, cultural, and climate benefits but remain poorly recognized in city plans.
163. Untangling the role of urban ecosystems as habitats for endangered plant species
| G. Planchuelo, Moritz von der Lippe and Ingo Kowarik | Landscape and Urban Planning | 2019
Berlin data show endangered plant populations occur not only in natural remnants but also in human-created and novel urban habitats.
164. More than weeds: Spontaneous vegetation in streets as a neglected element of urban biodiversity
| Sébastien Bonthoux et al. | Landscape and Urban Planning | 2019
Surveys reveal hundreds of plant species growing spontaneously in pavement cracks and other street habitats typically excluded from urban biodiversity planning.
165. The distinct ecological and social roles that wild spaces play in urban ecosystems
| Caragh G. Threlfall and Dave Kendal | Urban Forestry & Urban Greening | 2018
Reviews how unmanaged and semi-wild places complement traditional parks by providing distinctive habitats and opportunities for experiencing spontaneous nature.
166. Plant population success across urban ecosystems: A framework to inform biodiversity conservation in cities
| Ingo Kowarik and Moritz von der Lippe | Journal of Applied Ecology | 2018
Proposes evaluating whether urban plant populations are self-sustaining rather than relying only on simple species-presence inventories.
167. What determines occurrence of threatened bird species on urban wastelands?
| Peter J. Meffert and Frank Dziock | Biological Conservation | 2012
Large wasteland patches containing appropriate open vegetation can provide habitat for threatened birds ordinarily associated with declining agricultural landscapes.
168. Novel urban ecosystems, biodiversity, and conservation
| Ingo Kowarik | Environmental Pollution | 2011
Explains why highly altered and novel urban ecosystems can contain substantial biodiversity and deserve consideration alongside remnants of historical ecosystems.
169. Changes in the functional composition of a Central European urban flora over three centuries
| Sonja Knapp et al. | Perspectives in Plant Ecology, Evolution and Systematics | 2010
More than three centuries of records from Halle, Germany reveal substantial turnover in plant species and ecological traits as the city developed.
170. A global synthesis of plant extinction rates in urban areas
| Amy K. Hahs et al. | Ecology Letters | 2009
Historical records from 22 cities reveal that development history and remaining native vegetation strongly influence urban plant-extinction rates.
Green Roofs, Walls, Streets and Engineered Habitat
171. Urban green roofs as habitat and foraging sites for ants
| Grace H. Walusis and Chelse M. Prather | Urban Ecosystems | 2026
Compares ants on green roofs and ground-level urban habitats while testing how roof size, age, and building height affect habitat use.
172. Unsupervised mapping of urban tree diversity using spatially-aware visual clustering
| Diaa Addeen Abuhani et al. | Scientific Reports | 2026
Demonstrates remote-sensing and artificial-intelligence methods for mapping urban tree diversity where detailed municipal inventories are unavailable.
173. Native plants on experimental urban green roofs support higher community-level insect abundance than exotics
| Green-roof ecology researchers | Urban Forestry & Urban Greening | 2023
Experimental roofs planted with native vegetation support greater overall insect abundance than comparable roofs planted with exotic species.
174. The relationship between green roofs and urban biodiversity: a systematic review
| L. Wang et al. | Biodiversity and Conservation | 2022
Synthesizes evidence on plants and animals using green roofs and identifies design features that determine their effectiveness as urban habitat.
175. Walls offer potential to improve urban biodiversity
| Chundi Chen et al. | Scientific Reports | 2020
Surveys in Chongqing show that ordinary urban walls can support unexpectedly rich spontaneous plant communities.
176. Quantifying the contributions of native and non-native trees to a city's biodiversity and ecosystem services
| Marc A. Schlaepfer et al. | Urban Forestry & Urban Greening | 2020
Geneva's tree inventory demonstrates that both native and introduced trees contribute substantially to urban biodiversity and ecosystem services.
177. Public attitudes toward biodiversity-friendly greenspace management in Europe
| Leonie K. Fischer et al. | Conservation Letters | 2020
Surveys of more than 2,000 residents in 19 European cities find broad support for biodiversity-friendly management when spaces retain visible signs of intentional care.
178. Ecosystem service provision by road verges
| Benjamin B. Phillips et al. | Journal of Applied Ecology | 2020
Reviews roadside vegetation as a vast connected habitat network capable of supporting biodiversity, pollination, climate regulation, and other ecosystem services.
179. Human and biophysical legacies shape contemporary urban forests: A literature synthesis
| Lara A. Roman et al. | Urban Forestry & Urban Greening | 2018
Shows how historical planning, social conditions, land use, climate, disturbances, pests, and management continue to shape today's urban forests.
180. Green roof plant species diversity improves ecosystem multifunctionality
| Jeremy T. Lundholm | Journal of Applied Ecology | 2015
Increasing plant richness and life-form diversity improves multiple green-roof functions including biomass production, cooling, stormwater retention, and nutrient uptake.
Urban Water, Ponds and Freshwater Biodiversity
181. Systematic review reveals patterns, trends, and knowledge gaps in the urban ecology of freshwater ecosystems
| Laura Beatriz Gomes Mendonça et al. | Hydrobiologia | 2026
Reviews urban rivers, ponds, wetlands, lakes, and associated organisms while identifying pollution, fragmentation, and limited conservation implementation as recurring problems.
182. eDNA, forensic ecologies and the barcoding of urban life
| Matthew Gandy | Nature Cities | 2026
Explores how environmental DNA and genomic techniques are changing the ways scientists detect and conceptualize biological life within cities.
183. Urban landscape-level biodiversity assessments of aquatic and terrestrial vertebrates by environmental DNA metabarcoding
| Environmental DNA researchers | Journal of Environmental Management | 2023
Water samples collected across Beijing detected fish, reptiles, birds, and mammals, demonstrating the potential of eDNA for city-scale biodiversity monitoring.
184. Toward management of urban ponds for freshwater biodiversity
| Beat Oertli and Kirsten M. Parris | Ecosphere | 2019
Synthesizes practical approaches for designing and managing city ponds so they provide habitat for diverse freshwater organisms.
185. Ecological restoration of urban waters and the pressures that constrain recovery
| Sven Teurlincx et al. | Current Opinion in Environmental Sustainability | 2019
Examines pollution, altered hydrology, habitat modification, invasive species, and other interacting pressures that complicate restoration of urban aquatic ecosystems.
186. Mosquitoes in urban green spaces: using an island biogeographic approach to identify drivers of species richness and composition
| Antônio Ralph Medeiros-Sousa et al. | Scientific Reports | 2017
Shows that the size, isolation, vegetation, and landscape context of urban green spaces influence mosquito community richness and composition.
187. Wetland restoration to enhance biodiversity in urban areas: a comparative analysis
| K.-G. Kim, H. Lee and D.-H. Lee | Landscape and Ecological Engineering | 2011
Compares urban wetland-restoration projects and identifies ecological design choices capable of improving habitat quality and biodiversity.
188. Deculverting: reviewing the evidence on the daylighting and restoration of culverted rivers
| Tim C. Wild et al. | Water and Environment Journal | 2011
Reviews restoration projects that uncover buried urban waterways and considers their ecological, hydrological, landscape, and social benefits.
189. Effects of wastewater treatment plant effluent on bat foraging ecology in an urban stream system
| Matina C. Kalcounis-Rueppell et al. | Biological Conservation | 2007
Demonstrates how altered urban streams can change insect resources and consequently affect the foraging activity of bats.
Pollution, Equity, Gardens and Urban Conservation Culture
190. Wildlife gardening: an urban nexus of social and ecological relationships
| Laura Mumaw and Luis Mata | Frontiers in Ecology and the Environment | 2022
Wildlife-friendly gardening can simultaneously create habitat, strengthen people's connection with nature, and build community relationships around conservation.
191. A plea for a worldwide development of dark infrastructure for biodiversity – Practical examples and ways to go forward
| Romain Sordello et al. | Landscape and Urban Planning | 2022
Proposes networks of deliberately dark habitats and corridors to reduce fragmentation caused by artificial light at night.
192. Actions, indicators, and outputs in urban biodiversity plans: A multinational analysis of city practice
| Jennifer Rae Pierce et al. | PLOS ONE | 2020
Analysis of biodiversity plans from 39 cities identifies thousands of proposed actions but finds that relatively few are linked to measurable indicators capable of tracking conservation outcomes.
193. Investigating the impact of street lighting changes on garden moth communities
| Gavin M. Siriwardena et al. | Journal of Urban Ecology | 2016
Changes in lamp technology, density, and proximity alter moth communities and may turn illuminated suburban gardens into ecological traps.
194. Perception and knowledge of plant diversity among urban park users
| Audrey Muratet et al. | Landscape and Urban Planning | 2015
Park users appreciate biologically rich vegetation but often underestimate actual species diversity and may prefer wild vegetation to retain signs of management.
195. Urban green space, public health, and environmental justice: The challenge of making cities 'just green enough'
| Jennifer R. Wolch, Jason Byrne and Joshua P. Newell | Landscape and Urban Planning | 2014
Examines how urban greening can improve health and environmental quality while potentially producing displacement and green gentrification.
196. Green justice or just green? Provision of urban green spaces in Berlin, Germany
| Nadja Kabisch and Dagmar Haase | Landscape and Urban Planning | 2014
Finds significant social inequalities in the distribution, accessibility, and use of Berlin's green spaces despite relatively high overall provision.
197. Enhancing urban biodiversity and its influence on city-dwellers: An experiment
| Anne-Caroline Shwartz et al. | Biological Conservation | 2014
Experimental increases in flowers, birds, and pollinators show that ecological improvements do not necessarily translate automatically into greater public awareness of biodiversity.
198. Plant traits link people's plant preferences to the composition of their gardens
Demonstrates that homeowners' aesthetic and ecological preferences help shape the exceptionally diverse plant communities found across residential gardens.
199. Noise Pollution Changes Avian Communities and Species Interactions
| Clinton D. Francis, Catherine P. Ortega and Alexander Cruz | Current Biology | 2009
Experimental evidence shows that anthropogenic noise changes bird-community composition and can indirectly alter predator-prey relationships and reproductive success.
