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Ecological Intelligence

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Ecological Intelligence / Subject

Connectivity

Peer-reviewed Europe

Rome's river was a corridor for some dispersers and a barrier for others

Evidence
Peer-reviewed
Geography
Rome metropolitan region, Italy
System
Urban protected areas / corridor modeling

WHAT THE EVIDENCE SAYS

Researchers modeled protected-area connectivity with circuit and graph theory under nine resistance scenarios representing three dispersal modes. The western and peripheral city sectors were generally more permeable than the center and east. The Tiber River appeared as either connective space or resistance depending on the assumed species' movement strategy. Shared candidate links often followed rivers and urban green spaces.

WHY IT MATTERS / OUR READ

Urban landscape plans should test which animals can actually cross a proposed corridor; a riverbank or park is not universally connected simply because it is green in an aerial image.

CAVEATS / UNCERTAINTY

Results are based on modeled resistance and dispersal assumptions, not observed migration or survival. Rome's urban form and species assemblages limit direct transfer of the identified corridor locations to other cities.

SOURCE

Landscape Ecology — Russo et al. (2026)
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Urban connectivity models suggest that no single green-link map represents all wildlife movement.

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Peer-reviewed Asia

Sumatra's narrow forest remnants held mammals plantations largely missed

Evidence
Peer-reviewed
Geography
Modified peat-swamp forest and Acacia plantations, Sumatra, Indonesia
System
Tropical peat forest / working landscape

WHAT THE EVIDENCE SAYS

Across 17,132 camera-trap days in a proposed nature-based-solutions landscape, researchers recorded 23 medium-to-large mammal species. They detected six species in young Acacia plantations, 11 in mature plantations, and 19 each in linear forest remnants and core forest. The team modeled habitat priorities for eight threatened or conservation-concern species and explored alternative landscape configurations under explicit scenario assumptions.

WHY IT MATTERS / OUR READ

Peatland management is not simply a choice between intact reserves and production plantations. Narrow remnants may carry disproportionate conservation value and provide a practical starting point for protecting habitat structure, while the modeled scenarios help frame decisions about corridors and land cover rather than proving future outcomes.

CAVEATS / UNCERTAINTY

Camera detection and modeled habitat suitability are not direct measures of abundance, population trends or realized restoration gains. The scenarios hold peat depth, roads and water features static; they are planning hypotheses in one Sumatran landscape, not field-tested forecasts of species recovery.

SOURCE

Journal of Applied Ecology — Pinondang et al. (2026)
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A 723,637-hectare peatland landscape analysis finds meaningful habitat in linear forest remnants, while plantations support fewer detected mammal species.

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Peer-reviewed North America

The Elwha's insects returned in number before their river community recovered

Evidence
Peer-reviewed
Geography
Elwha River, Washington, United States
System
River / dam removal / sediment disturbance

WHAT THE EVIDENCE SAYS

Following removal of the Elwha and Glines Canyon dams, more than 20 million tonnes of reservoir sediment moved downstream as passage reopened to more than 90% of the watershed. Across five river reaches and nine years of observations, benthic invertebrate density fell as much as 95% during active removal, then returned near baseline within roughly three years of peak sediment transport. Taxa richness and community composition, notably some caddisflies and longer-lived groups, remained altered after that interval.

WHY IT MATTERS / OUR READ

The ecological signature of a restoration project can contain immediate disturbance, recovery in one metric and prolonged change in another. Restoration success criteria should distinguish connectivity, organism numbers, sensitive taxa and community composition; the years after construction are part of the intervention, not an optional follow-up.

CAVEATS / UNCERTAINTY

Observational before-during-after monitoring was conducted in one very large dam-removal system, with fish recolonization, sediment and habitat succession interacting. A numerical rebound does not prove all functions or populations are restored; these outcomes do not imply dams should remain.

SOURCE

Frontiers in Ecology and Evolution — Morley et al. (2026)
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Nine years of monitoring after two large dam removals show that the rebound in insect abundance and the recovery of community composition are not the same milestone.

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Peer-reviewed Europe

Young planted woods offer habitat before they become functioning corridors

Evidence
Peer-reviewed
Geography
England, United Kingdom; ten planted-woodland study landscapes
System
Temperate working-land woodland mosaics; landscape connectivity

WHAT THE EVIDENCE SAYS

Researchers compared newly planted woodlands with adjacent agricultural ground and older woodland using vegetation, invertebrate sampling, small-mammal tags and fungal indicators. Several groups used the new woodland more than farmland, but responses differed among species, and the monitoring did not establish completed movements between separated mature forest patches.

WHY IT MATTERS / OUR READ

Planting trees changes available habitat and potentially the resistance of the landscape between established woods. Calling new plantations functional wildlife corridors, however, requires direct evidence of movement, dispersal or population exchange rather than habitat occupation alone.

CAVEATS / UNCERTAINTY

Only ten sites were examined, with six paired comparisons; distances and short observation windows constrain connectivity inference. Habitat use does not equal gene flow or population-level demographic rescue, and fungal indicators do not prove dispersal pathways.

SOURCE

Landscape Ecology · planted woodland and multi-taxon connectivity study
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A ten-site English landscape study found use by several taxa, while evidence of movement between established woods remained much harder to establish.

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Peer-reviewed Asia

A greener urban-growth scenario still left old habitat barriers intact

Evidence
Peer-reviewed
Geography
Yangtze River Delta urban region, China
System
Urban development; ecological networks; landscape connectivity

WHAT THE EVIDENCE SAYS

A spatial scenario study of the Yangtze River Delta compared future urbanization and ecological-protection pathways through 2035. It projected major built-up expansion under a development-oriented scenario and relatively small net ecological-space gains under protection assumptions; important inherited connectivity bottlenecks persisted even in the more favorable scenario.

WHY IT MATTERS / OUR READ

A planning rule that slows habitat conversion does not necessarily restore connections already severed by infrastructure. Effective blue-green network plans should distinguish avoided loss, restored passage and feasible long-term management.

CAVEATS / UNCERTAINTY

These are model scenarios, not measured 2035 outcomes or validated animal movements. Land-cover definitions, scenario inputs and spatial resolution constrain quantitative forecasts; accepted journal version awaits final formatting.

SOURCE

Frontiers in Ecology and Evolution · Yangtze Delta urban-connectivity scenario study
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Yangtze River Delta connectivity modeling distinguishes prevented future damage from repairing existing fragmentation.

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Peer-reviewed North America

Maps of wildlife movement and climate refugia did not always agree

Evidence
Peer-reviewed
Geography
Far western North America; 103 conservation connectivity maps
System
Habitat connectivity; climate adaptation; spatial decision-making

WHAT THE EVIDENCE SAYS

A comparison of 103 connectivity and climate-adaptation maps in far western North America documented divergent priorities among approaches that represented existing ecological movement patterns versus longer-term climate-related connectivity. Areas of convergence were fewer and more selective than a single generalized corridor map might suggest.

WHY IT MATTERS / OUR READ

GIS synthesis should show where layers agree, where they conflict and which biological decision each serves. A route useful for present-day movement may not be the same landscape investment needed under future climate change.

CAVEATS / UNCERTAINTY

A comparison of modeled spatial products is not a direct test of animal movement or realized adaptation; input scales and assumptions influence apparent agreement.

SOURCE

Landscape Ecology · western North America connectivity-map comparison
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Comparing 103 connectivity maps reveals priorities that depend heavily on model purpose.

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Peer-reviewed Global

A roads meta-analysis found an average wildlife cost—and big uncertainty

Evidence
Peer-reviewed
Geography
Studies spanning multiple world regions
System
Road corridors; terrestrial wildlife communities

WHAT THE EVIDENCE SAYS

Reviewers fitted three-level models to 643 effect estimates from 160 studies. On the log-response-ratio scale, wildlife outcomes near roads averaged about 32% lower, but the standardized mean difference and correlation estimates had confidence intervals crossing zero. Prediction intervals spanned positive and negative responses; traffic volume was reported for only 91 effects.

WHY IT MATTERS / OUR READ

An average road effect is not an adequate crossing-location or mitigation design. Species, outcome type, traffic exposure and nearby habitat all matter; mixed effect scales should not be silently collapsed into a single universal loss percentage.

CAVEATS / UNCERTAINTY

Effects were heterogeneous and most studies did not supply standardized traffic-volume information. This synthesis is observational across studies and does not prove a single causal road response for all taxa or habitats.

SOURCE

Frontiers in Ecology and Evolution — primary systematic review and meta-analysis
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A synthesis of 160 studies found a roughly 32% reduction on one effect scale, while other effect metrics were uncertain and site results varied greatly.

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Peer-reviewed Africa

In western Rwanda, connected tree cover was not the same as connected biodiversity

Evidence
Peer-reviewed
Geography
Western Province, Rwanda
System
Afromontane forest mosaic; home gardens; agroforestry

WHAT THE EVIDENCE SAYS

Researchers used Omniscape circuit-theory connectivity surfaces for trees and home gardens and compared them with woody-plant and bird richness and diversity at 91 field sites. Connectivity dominated by exotic plantations was negatively associated with these biodiversity measures; home-garden connectivity was positively associated. The analysis supports gardens as complementary stepping stones.

WHY IT MATTERS / OUR READ

Counting additional trees can be a poor proxy for habitat that animals actually use. Landscape restoration should distinguish native-forest protection, planted-canopy extent and biodiversity-supporting matrix habitat.

CAVEATS / UNCERTAINTY

These are observational associations in one Rwandan region, not proof that creating any home garden will cause equivalent biodiversity gains. Gardens do not replace primary native forest or the habitat requirements of forest specialists.

SOURCE

Landscape Ecology — primary field and connectivity study
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Bird and woody-plant surveys at 91 sites favored connected traditional home gardens over connectivity dominated by exotic tree plantations.

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Peer-reviewed Global

Diversity in dispersal strategies can buffer competitive-exclusion risk

Evidence
Peer-reviewed
Geography
Global framework; forest validation datasets
System
Ecological communities / forests

WHAT THE EVIDENCE SAYS

The study develops a competitive-balance metric that incorporates abundance, diversity of dispersal strategies and interspecific interactions. For a given abundance, greater heterogeneity in dispersal strategies reduced modeled vulnerability to competitive exclusion, and the framework was evaluated with tropical and temperate forest data.

WHY IT MATTERS / OUR READ

Connectivity is not just the amount of movement. Diversity in how species move can itself contribute to coexistence, which may matter when corridors, fragmentation or restoration simplify movement opportunities.

CAVEATS / UNCERTAINTY

The core result is theoretical and has so far been validated mainly against forest datasets. Its usefulness across other taxa, disturbance regimes and managed landscapes remains to be tested.

SOURCE

Nature Ecology & Evolution — primary theory and validation study
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A new framework combines abundance, dispersal diversity and competition to estimate local-extinction vulnerability; forest data suggest heterogeneous dispersal strategies can reduce exclusion risk.

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Mediterranean shoreline connectivity is low enough that ships can leave a genomic fingerprint

Evidence
Peer-reviewed population genomics and oceanographic modeling
Geography
Western and eastern Mediterranean coasts from Spain to Israel
System
Rocky intertidal marine coast

WHAT THE EVIDENCE SAYS

For two sympatric Phorcus topshells, short particle-tracking runs showed strong local retention and even 90-day simulations did not connect the western and eastern Mediterranean basins. Genomic structure supported low natural connectivity, while near-identical profiles between localities separated by more than 1,000 km—near major ports—were inconsistent with a simple coastal stepping-stone pattern and supported human-mediated dispersal.

WHY IT MATTERS / OUR READ

Connectivity models should include transport pathways created by people. Natural currents can imply strong isolation while ports and vessels create rare jumps that reorganize population structure and potentially move species or genotypes across barriers.

CAVEATS / UNCERTAINTY

Ship-mediated dispersal is inferred from the mismatch between natural-dispersal modeling, genomic similarity and port geography rather than observed directly on vessels. Results are species- and region-specific, and particle simulations simplify larval behavior.

SOURCE

ICES Journal of Marine Science — primary study
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Population genomics and particle tracking found strong local retention in two topshells while matching genotypes more than 1,000 km apart pointed to human-mediated long-distance transport.

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Peer-reviewed

Steppe-bird home ranges are built from a literature skewed toward western European adult males

Evidence
Peer-reviewed
Geography
Palaearctic steppe-bird literature
System
Steppe birds and agricultural landscapes

WHAT THE EVIDENCE SAYS

A systematic review and multi-species meta-analysis retained 39 primary studies on seven non-passerine steppe birds. Most research came from western Europe and arable landscapes, with sparse coverage of natural grasslands, shrublands, eastern Europe, western and central Asia, northern Africa and wintering ranges. Adult males in the breeding season made up 75.6% of 623 tracked individuals. VHF dominated the published estimates, and comparable GPS estimates tended to produce larger and more variable home ranges.

WHY IT MATTERS / OUR READ

A home-range number is not portable across sex, season, habitat and tracking technology. Environmental assessment and conservation planning can look precise while inheriting a deeply uneven evidence base.

CAVEATS / UNCERTAINTY

This is a synthesis of published studies, so the result partly reflects what researchers chose and were able to publish. It maps evidence gaps and methodological heterogeneity rather than establishing one correct home-range size or a universal buffer distance.

SOURCE

Animal Biotelemetry — systematic review/meta-analysis
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A 39-study meta-analysis found 75.6% of tracked birds were adult males and major parts of eastern Europe, Central/West Asia and North Africa remain poorly represented.

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Peer-reviewed Africa

Indigenous tracking mapped a 22,000-km² wildlife corridor that conventional surveys struggle to cover

Evidence
Peer-reviewed
Geography
Western Kgalagadi Conservation Corridor, Botswana
System
Kalahari multiuse wildlife-management areas

WHAT THE EVIDENCE SAYS

Researchers combined biannual track surveys by Indigenous certified trackers with a density-estimation framework across roughly 22,000 km² over three years. The team analyzed 22,793 tracks from 13 large-herbivore and carnivore species collected along 6,222 km of transects. Some herbivores declined over the study period while carnivore densities showed no detected change. Cattleposts were negatively associated with most species; burned areas, vegetation and distance to mineral pans had species-specific associations. Predictive maps identified higher-density areas and potential movement pathways away from concentrated human activity.

WHY IT MATTERS / OUR READ

The important method signal is that monitoring can be built around knowledge already adapted to the landscape. In sandy systems where tracks are persistent and expert identification is available, Indigenous tracking can generate spatially extensive wildlife information at a scale that would be costly to reproduce with cameras or captures alone. The land-use result also keeps the corridor problem concrete: multiuse land can remain functional for wildlife while becoming less permeable around sedentary livestock infrastructure.

CAVEATS / UNCERTAINTY

Track-density estimators depend on assumptions about track accumulation, animal movement, detectability and correct identification; they are not direct censuses. Associations with cattleposts, fire, vegetation and pans are observational rather than experimental. The approach also depends on suitable substrate and highly skilled trackers, so the exact method is not automatically transferable to every landscape.

SOURCE

Conservation Biology — primary study
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Over three years in Botswana’s Kalahari, certified trackers logged 22,793 tracks across 6,222 km; cattleposts were negatively associated with most of 13 monitored species, while burned areas produced mixed responses.

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Peer-reviewed Global

Landscape genetics is still extrapolating from single landscapes more often than it replicates

Evidence
Peer-reviewed
Geography
Global literature review
System
Landscape connectivity / population genetics

WHAT THE EVIDENCE SAYS

A review of 544 empirical landscape-genetics studies from 2011–2026 found 88, or 16.2%, used spatially replicated designs, with no clear increase over time. Only 30.7% of replicated studies formally compared landscape characteristics among study areas. Mammals made up 35.3% of studies, while North America and Europe accounted for most geographic coverage.

WHY IT MATTERS / OUR READ

Connectivity maps can look general even when the inference behind them is local. For decisions that move from one landscape to another, replication and explicit comparison of landscape structure are not methodological luxuries; they are part of knowing whether a resistance relationship is transferable.

CAVEATS / UNCERTAINTY

This is a review of published landscape-genetics studies using the authors’ definitions of replication and comparison. Publication and indexing practices can affect the apparent distribution of the field, and replication itself does not guarantee good inference.

SOURCE

Current Landscape Ecology Reports
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A review of 544 studies found only 16.2% used spatial replication, with strong mammal and North America/Europe biases.

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Peer-reviewed North America

Urban connectivity may work differently once organisms are allowed to evolve

Evidence
Peer-reviewed
Geography
100 metropolitan areas, United States
System
Urban landscapes and plant–pollinator metacommunities

WHAT THE EVIDENCE SAYS

Across 100 U.S. metropolitan regions, urban landscapes had lower heterogeneity and forest aggregation and higher aggregation of developed land than non-urban landscapes. A proof-of-concept spatial eco-evolutionary plant–pollinator model then showed that heterogeneity and connectivity can delay extinction, but trait evolution and mutualistic feedbacks change the size of those benefits.

WHY IT MATTERS / OUR READ

Green corridors and habitat networks are not static plumbing. If species interactions and traits change in fragmented urban landscapes, design performance may depend on how connectivity shapes both movement and adaptation over time.

CAVEATS / UNCERTAINTY

The empirical landscape analysis does not measure observed extinction outcomes, and the eco-evolutionary result comes from a proof-of-concept model rather than a post-occupancy design experiment. The 100-city U.S. sample may not generalize to other urban forms.

SOURCE

Landscape Ecology
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A 100-city landscape analysis paired with a plant–pollinator model suggests that heterogeneity and connectivity can delay extinction, while evolutionary feedbacks can erode some of that benefit.

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Peer-reviewed Africa

Intensive cropland is showing up as a connectivity barrier for Guinea baboons

Evidence
Peer-reviewed
Geography
West Africa; Guinea baboon range
System
Savanna, forest–agriculture mosaics and riverine corridors

WHAT THE EVIDENCE SAYS

Researchers genotyped 243 non-invasively collected fecal samples across the Guinea baboon range. Genetic diversity was positively associated with shrublands and forest–savanna mosaics; rivers, grasslands and shrublands were associated with functional connectivity, while intensive cropland and large water bodies acted as stronger resistance. Forest–cropland mosaics were more permeable than strict monocultures.

WHY IT MATTERS / OUR READ

The useful conservation unit is the landscape matrix, not simply the amount of habitat left. In a species able to use human-modified landscapes, heterogeneous working lands and riverine corridors may retain connectivity that intensive monocultures do not.

CAVEATS / UNCERTAINTY

Landscape-genetic resistance models infer potential connectivity rather than observing contemporary dispersal directly. Genetic structure also integrates historical demography and past landscapes, and the diversity–environment analysis had limited power across only ten geographic demes; the study does not prove that converting an individual farm to agroforestry will restore gene flow.

SOURCE

Heredity
View original evidence ↗

Range-wide landscape genetics found heterogeneous savanna–forest mosaics and river systems more permeable than intensive agriculture, with the Gambian populations carrying the lowest diversity and highest inbreeding.

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Peer-reviewed Latin America & Caribbean

Elkhorn coral is genetically more structured across the Caribbean than older markers could see

Evidence
Peer-reviewed
Geography
Caribbean and western North Atlantic
System
Coral reefs

WHAT THE EVIDENCE SAYS

A conservation-genomics analysis drew on roughly 3,900 Acropora palmata samples representing about 1,400 genets from 12 regions and 18,898 SNP loci. The authors resolved nine weakly differentiated spatial genetic clusters, found evidence that ocean circulation contributes to connectivity patterns, and identified kinship patterns associated with assisted sexual reproduction and restoration history.

WHY IT MATTERS / OUR READ

For coral restoration, 'Caribbean-wide' is too coarse to mean genetically interchangeable. Population structure, current-mediated connectivity and relatedness among nursery or outplant material can all become part of broodstock and assisted-reproduction decisions.

CAVEATS / UNCERTAINTY

Genetic differentiation is generally weak and does not by itself measure demographic recovery, local adaptation or transplant performance. Sampling reflects multiple historical programs, and genetic information should be combined with local ecology, disease risk and restoration objectives rather than used as a stand-alone prescription.

SOURCE

Conservation Genetics
View original evidence ↗

High-resolution genotyping resolves nine weakly differentiated clusters and shows ocean currents helping organize gene flow—useful context for restoration broodstock and assisted reproduction.

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Peer-reviewed Africa

One invasive fish can suppress another—and leave a native remnant in the middle

Evidence
Peer-reviewed
Geography
Breede River, Western Cape, South Africa
System
River fish community

WHAT THE EVIDENCE SAYS

A river survey recorded 2,546 fish representing 17 species, seven of them introduced. Sharptooth catfish frequency was negatively associated with fish diversity, while invasive black bass showed the opposite broad association; flow barriers, high catfish abundance and turbidity appeared to suppress visually hunting bass enough for endangered Berg-Breede whitefish to persist at very low frequency.

WHY IT MATTERS / OUR READ

In invaded systems, management can face interacting pressures rather than one clean native-versus-invasive axis. Removing one stressor can change the effect of another, which makes food-web and barrier context relevant to control decisions.

CAVEATS / UNCERTAINTY

The whitefish remnant is persistence, not recovery. The evidence is observational and site-specific, and antagonism among invasive fishes is not an argument to retain invasive species or barriers; intervention effects would need direct testing.

SOURCE

Biological Invasions
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In South Africa’s Breede River, flow barriers, turbidity and abundant sharptooth catfish appear to damp black-bass predation enough for an endangered whitefish to persist at extremely low frequency.

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Peer-reviewed

For migratory shorebirds, the landscape around a habitat patch improved the prediction

Evidence
Peer-reviewed
Geography
Coastal East Asian–Australasian Flyway
System
Coastal wetlands / migratory shorebird habitat

WHAT THE EVIDENCE SAYS

Across six migratory shorebird species in the non-breeding season, species-distribution models that incorporated neighborhood habitat composition and configuration generally predicted habitat suitability better than conventional pixel-scale or distance-only models. Important predictors included distance to tidal flats and seasonal inland wetlands, tidal-flat area and patch density, land-cover diversity, and elevation; predicted suitability was only weakly positively correlated with observed abundance for most species.

WHY IT MATTERS / OUR READ

Habitat is not only the patch under a bird. For mobile species in heavily altered coastal landscapes, surrounding composition and configuration can change which places function as habitat and can change conservation-priority maps.

CAVEATS / UNCERTAINTY

This is modeling evidence for six species, not a demographic test of survival or population growth. Abundance correlations were weak, and the publisher is currently sharing an accepted early version that remains subject to copyediting.

SOURCE

Communications Earth & Environment
View original evidence ↗

Across six East Asian–Australasian Flyway species, models that added tidal-flat amount, patch density and surrounding land-cover diversity generally outperformed pixel- or distance-only habitat models.

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Peer-reviewed North America

A U.S. freshwater conservation map changes when resilience and connectivity are treated as properties of the network

Evidence
Peer-reviewed
Geography
Conterminous United States
System
Rivers, streams and small watersheds

WHAT THE EVIDENCE SAYS

The study scored HUC-12 watersheds for connectivity, condition, water availability and naturalness, then overlaid 91 freshwater biodiversity assessments. The resulting network covers 35% of the conterminous U.S.: 19% scored resilient and 16% restorable. It contains 67% of recognized biodiversity areas and 75% of free-flowing rivers; just 6% is both protected and resilient, while 14% is unprotected and restorable.

WHY IT MATTERS / OUR READ

The useful contribution is a decision surface rather than a single protection target. It separates places that are already resilient from places where restoration could change network function, making connectivity and climate context explicit in freshwater prioritization.

CAVEATS / UNCERTAINTY

This is a spatial prioritization framework, not evidence that conserving exactly 35% guarantees biodiversity persistence. Human water needs and many local implementation constraints are not embedded in the core network and must be layered into actual decisions.

SOURCE

PLOS ONE
View original evidence ↗

A continental planning analysis identifies a 35% freshwater network that combines representation, resilience, connectivity and biodiversity—but only 6% is both protected and resilient.

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Peer-reviewed

Roads are fragmenting South Korea’s mammal habitat even where forest patches remain

Evidence
Peer-reviewed
Geography
Republic of Korea
System
National forest and mixed-landscape habitat patches

WHAT THE EVIDENCE SAYS

A Scientific Reports study analyzed 6,176 habitat patches across the Republic of Korea using nationwide mammal occurrence data. More than two-thirds of patches were smaller than one square kilometre. Mammal species richness increased with patch size and structural connectivity, and highly connected patches supported nearly twice the richness of poorly connected patches above the study's connectivity threshold. Richness was also lower in patches within roughly one kilometre of roads than in patches farther away.

WHY IT MATTERS / OUR READ

Habitat retained on a map can be functionally downgraded by the infrastructure around it. The planning implication is to treat road proximity, patch size and connection to neighboring habitat as parts of habitat condition—not separate layers added after the conservation map is drawn.

CAVEATS / UNCERTAINTY

This is an observational richness analysis, not a direct measurement of population viability, movement or gene flow. Road proximity covaries with land use and human activity, occurrence data carry detectability bias, and the connectivity threshold should not be treated as a universal design standard outside the study landscape.

SOURCE

Scientific Reports
View original evidence ↗

A nationwide analysis of 6,176 habitat patches found mammal richness rose with patch size and connectivity and was lower close to roads, showing that retained habitat can still lose ecological value when the network around it is severed.

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Institutional report Europe

The Western Balkans now have regional biodiversity and forest-restoration frameworks to 2030

Evidence
Institutional / NGO report
Geography
Western Balkans
System
Regional terrestrial, inland-water, coastal and forest landscapes

WHAT THE EVIDENCE SAYS

At a September 18 ministerial meeting in Montenegro, governments endorsed a Western Balkans Six Biodiversity Strategic Plan 2030 and a Forest Landscape Restoration Plan. The frameworks include targets to effectively conserve at least 30% of terrestrial, inland-water, marine and coastal areas, restore at least 20% of degraded ecosystems, halt species loss and strengthen ecological connectivity and resilience.

WHY IT MATTERS / OUR READ

The signal is regional coordination: ecological networks and restoration priorities can be planned across political borders rather than as six separate national portfolios. The next question is whether targets are translated into financed, monitored and enforceable implementation.

CAVEATS / UNCERTAINTY

These are newly endorsed policy frameworks, not measured ecological outcomes. Target percentages do not demonstrate effective protection or restoration, and delivery will depend on national implementation, finance, governance and monitoring.

SOURCE

IUCN
View original evidence ↗

Ministers endorsed shared targets for protected-area effectiveness, ecosystem restoration, species conservation and ecological connectivity across the six Western Balkan economies.

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Peer-reviewed Global

Atlantic seabird tracking says MPA placement matters nearly as much as MPA area

Evidence
Peer-reviewed
Geography
Atlantic Ocean; colonies in more than 20 countries
System
Pelagic and coastal seabird migration networks

WHAT THE EVIDENCE SAYS

Researchers synthesized 3.56 million tracking locations from 13,060 adult seabirds representing 44 species and 206 colonies. Existing Atlantic MPAs cover about 6.9% of the ocean area and overlap roughly 11–13% of tracked-species use density; optimization suggested the same protected-area footprint could capture about 30–34%, while a strategically located 30% network could capture roughly two-thirds or more.

WHY IT MATTERS / OUR READ

Area targets are incomplete spatial strategy for mobile species. If protected coverage expands without tracking where animals actually aggregate across seasons and jurisdictions, a larger network can still miss the ecological process it is meant to protect.

CAVEATS / UNCERTAINTY

The metric is tracked-species use density, not total bird abundance. Tracking coverage is uneven among taxa, colonies and years, adults dominate the dataset, some devices have coarse positional accuracy, and optimization demonstrates spatial potential rather than political feasibility or ecological effectiveness of protection.

SOURCE

Conservation Letters
View original evidence ↗

A 13,000-bird tracking synthesis suggests today’s Atlantic protected-area footprint captures far less migratory seabird use than the same area could if biodiversity layers shaped placement.

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Peer-reviewed Europe

In dense cities, bird richness tracked habitat area and connectivity more than urban form type

Evidence
Peer-reviewed
Geography
Gothenburg, Sweden
System
Dense and compact urban landscapes and green infrastructure

WHAT THE EVIDENCE SAYS

Researchers monitored birds across 30 Gothenburg sites in spring 2024: 19 sites representing three dense/compact urban form types and 11 greener reference areas. They recorded 61 species. Median species richness was lower in the dense/compact group than in reference areas (24 versus 33 species; p<0.001), but richness and composition did not differ significantly among the three urban form types themselves. Within the dense/compact sites, larger local natural-habitat area and greater structural connectivity were positively associated with species richness; in the best-supported model, a one-standard-deviation increase in local habitat area corresponded to about 16% higher expected richness and connectivity to about 10% higher richness.

WHY IT MATTERS / OUR READ

The planning signal is not that density is ecologically neutral. Dense and compact sites still underperformed greener reference areas. But within dense urban fabric, the broad form category was less informative than the amount of usable habitat retained locally and its connection to surrounding habitat. That shifts the design question from 'dense or compact?' toward how much habitat survives inside the fabric and whether it remains part of a functioning network.

CAVEATS / UNCERTAINTY

This is a 30-site observational study from one city and one spring season, focused on birds. Structural connectivity is a landscape proxy rather than measured movement, and the strongest 1.8-km scale is likely specific to Gothenburg's landscape. Passive acoustic/occurrence methods can miss infrequently vocalizing species. The associations should not be treated as universal design thresholds or proof that denser development causes the reported differences.

SOURCE

npj Urban Sustainability
View original evidence ↗

Across 30 Gothenburg sites, dense and compact neighborhoods had fewer bird species than greener reference areas, but the three urban form types did not differ significantly from one another; local natural habitat area and connectivity were the stronger within-city signals.

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Peer-reviewed Europe

Białowieża researchers are proposing wildlife passages through a border barrier while politics remain stuck

Evidence
Peer-reviewed
Geography
Białowieża Forest, Poland–Belarus
System
Transboundary temperate forest and border infrastructure

WHAT THE EVIDENCE SAYS

The authors propose modifying existing border infrastructure with designated gate openings, roughly A4-sized passages for medium mammals including lynx, and improved riverine permeability for larger mammals, paired with wildlife monitoring and injury-response protocols.

WHY IT MATTERS / OUR READ

The significance is pragmatic: ecological connectivity can sometimes be improved incrementally even when the geopolitical driver of fragmentation is unresolved. The authors still identify barrier removal as the preferred endpoint.

CAVEATS / UNCERTAINTY

This is a design and policy perspective, not an outcome trial showing that the proposed passage types restore movement or demography. Effectiveness, security feasibility and species-specific use would require monitoring.

SOURCE

Journal of Applied Ecology
View original evidence ↗

A new applied perspective lays out gate openings, small mammal passages and river-corridor permeability as interim connectivity measures across the Poland–Belarus barrier.

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Peer-reviewed North America

Dam removal changed Cuyahoga fish assemblages most where reconnection opened a real route to source populations

Evidence
Peer-reviewed
Geography
Cuyahoga River, Ohio, USA
System
Urban river fish assemblages and longitudinal connectivity

WHAT THE EVIDENCE SAYS

A Restoration Ecology analysis of Cuyahoga River fish data from 1984–2024 found that removal of Brecksville Dam in 2020 increased connectivity to Lake Erie by 39 river km and more than doubled free-flowing habitat below the remaining Gorge Plant Dam. Downstream reaches gained 15 newly detected taxa and shifted strongly through time; 12 of those taxa were native and three were nonnative. Upstream assemblages showed limited change consistent mostly with redistribution of resident species rather than colonization-driven turnover.

WHY IT MATTERS / OUR READ

Barrier removal is not a binary treatment. Its ecological value depends on what the removal reconnects to, what barriers remain and whether source populations can reach the restored reach. Reconnection can support native recolonization while also opening pathways for nonnative spread, so network position and invasion risk belong in restoration prioritization rather than connectivity being treated as an automatic benefit.

CAVEATS / UNCERTAINTY

The river also experienced decades of water-quality improvement, remediation and other restoration, so not all assemblage change can be attributed solely to one dam removal. Historic sampling intensity and timing also differed from recent standardized surveys. Three of the 15 newly detected downstream taxa were nonnative, and the authors explicitly flag invasion risk—including upstream expansion of Round goby—as a tradeoff of reconnection.

SOURCE

Restoration Ecology
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Four decades of data show strong downstream turnover after the Brecksville Dam removal, while reaches still isolated by another major barrier changed far less.

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Peer-reviewed Africa

African wild dogs can cross thousands of kilometres—but movement alone does not equal connectivity

Evidence
Peer-reviewed
Geography
Zambia, with regional relevance across eastern and southern Africa
System
African wild dog metapopulation and protected–unprotected landscape corridors

WHAT THE EVIDENCE SAYS

An Ecology report followed four recent African wild-dog dispersal events associated with Zambia’s major populations. The groups moved a combined 9,863 km, including a maximum path length of 4,126 km, and demonstrated that wild dogs can traverse protected areas, game-management areas and heavily human-used landscapes. But several dispersers died or disappeared in snaring-risk zones, groups often failed to immigrate into established packs, and the authors conclude that the extraordinary movements yielded little genetic or demographic connectivity.

WHY IT MATTERS / OUR READ

This separates landscape permeability from functional connectivity. A corridor can be physically traversable and still fail as conservation infrastructure if animals cannot survive the matrix, recruit into another population or reproduce. For large-carnivore planning, monitoring movement paths alone can therefore overstate success; survival, immigration and conflict risk belong in the connectivity metric.

CAVEATS / UNCERTAINTY

The paper reports a small number of exceptional dispersal events rather than a population-wide estimate of gene flow. Some mortality causes are inferred from collar and movement evidence, and the authors explicitly distinguish observed movement from demonstrated demographic or genetic connectivity.

SOURCE

Ecology
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GPS-tracked dispersers linked Zambia’s major wild-dog landscapes on paper, yet snares, failed immigration and conflict meant nearly 10,000 km of movement produced little demographic connectivity.

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Institutional report Global

Global flyways — Migratory bird risk is a network problem, not a site problem

Evidence
Institutional / NGO report
Geography
Global flyways
System
Migratory flyways

WHAT THE EVIDENCE SAYS

BirdLife International’s 2026 State of the World’s Birds synthesizes conservation-status data and scientific literature around migratory species and their flyways. The report emphasizes that migratory birds depend on linked breeding, non-breeding and stopover areas and face multiple threats distributed along those routes.

WHY IT MATTERS / OUR READ

For migratory wildlife, a protected site is only as useful as the network that connects it to the rest of the annual cycle. Flyway-scale assessment is a stronger decision frame than evaluating reserves or jurisdictions in isolation.

CAVEATS / UNCERTAINTY

This is a global NGO assessment synthesizing many underlying data sources and taxa. Threat intensity, evidence quality and conservation capacity vary substantially among flyways and species.

SOURCE

BirdLife International · State of the World’s Birds 2026
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BirdLife’s 2026 flagship assessment focuses on migratory species and the connected flyways that expose them to threats across breeding, non-breeding and stopover areas.

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Peer-reviewed Global

Freshwater — Gradual warming can create abrupt thermal fragmentation

Evidence
Peer-reviewed
Geography
Global river networks
System
Rivers and freshwater fish

WHAT THE EVIDENCE SAYS

Researchers combined weekly water-temperature projections from 1976–2099 with thermal limits for 9,809 freshwater species. The analysis shows that gradual warming can produce abrupt thermal exposure and fragment otherwise connected river habitat. Under a high-emissions scenario, around 63% of riverine fish were projected to experience more persistent thermal barriers.

WHY IT MATTERS / OUR READ

Connectivity is not just a map of physical channels. A river reach can remain physically connected while becoming functionally impassable because of temperature. Conservation planning that tracks mean warming or habitat area without thermal continuity can therefore miss a major persistence mechanism.

CAVEATS / UNCERTAINTY

This is a global screening model rather than a site-specific population forecast. It does not fully represent acclimation, adaptation, evolutionary change, species-specific movement behavior or every local thermal refuge.

SOURCE

Nature Climate Change · Original evidence
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A global analysis of 9,809 freshwater species suggests warming can turn continuous river networks into thermal barriers, creating abrupt exposure that average temperatures and range maps can miss.

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