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Ecological Intelligence

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Ecological Intelligence / Subject

dispersal

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 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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Peer-reviewed Europe

Alps — Microclimate helps climate connectivity, but strong warming still creates dead ends

Evidence
Peer-reviewed
Geography
Stubai Alps, Austria
System
Alpine and nival vegetation

WHAT THE EVIDENCE SAYS

Using 894 soil-temperature sensors and connectivity models from one- to 100-metre resolution, researchers found less than 7% of the landscape climatically disconnected under moderate warming. Under stronger warming, more than 30% remained disconnected even at fine resolution, with connectivity collapsing at the highest elevations.

WHY IT MATTERS / OUR READ

Microrefugia can buy space but are not an unlimited buffer. Fine-resolution climate mapping should be paired with dispersal distance and habitat constraints before assuming topographic heterogeneity will allow species to track warming.

CAVEATS / UNCERTAINTY

The analysis models temperature connectivity rather than realized plant movement and assumes simplified dispersal. Average required movement exceeded five kilometres under the strongest scenario, far beyond typical dispersal for many alpine plants.

SOURCE

Alpine Botany · Original evidence
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Fine-scale topography can improve access to cooler microsites, yet more than 30% of a modeled alpine landscape remained disconnected under strong warming.

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