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Ecological Intelligence

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Ecological Intelligence / Subject

mammals

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

Winter strategy helps explain why northern mammals are not all shrinking with warming

Evidence
Peer-reviewed
Geography
Yukon, Canada
System
Northern small-mammal communities

WHAT THE EVIDENCE SAYS

Researchers used roughly five decades of body-mass data from three northern mammals with contrasting overwintering strategies. Snowshoe hares, exposed above the snowpack, declined in body mass and responded negatively to temperature and snow. Deer mice showed no long-term body-mass trend but increased with growing-degree days, while red-backed voles increased with temperature and snow. The authors argue that winter ecology mediates which climate mechanism dominates.

WHY IT MATTERS / OUR READ

Body-size responses to warming are not a simple temperature rule. Natural history determines what climate exposure an animal actually experiences, so models that ignore subnivean refuge, snow conditions or seasonal strategy can average together opposite responses.

CAVEATS / UNCERTAINTY

Only three species in one rapidly warming northern region were examined, and body mass is not a direct fitness measure. Long-term observational relationships can reflect correlated ecological change, and results should not be generalized to all mammals or used as a universal body-size law.

SOURCE

Global Change Biology — primary study
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Nearly 50 years of Yukon data show snowshoe hares lost body mass while two subnivean rodents showed different or opposite trends—natural history changed the climate response.

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Peer-reviewed North America

Recreation noise can displace mammals for weeks after the sound stops

Evidence
Peer-reviewed
Geography
Bridger-Teton National Forest, Wyoming, USA
System
Public-land mammal habitat and recreation

WHAT THE EVIDENCE SAYS

At 12 sites over two field seasons, researchers broadcast motorized and non-motorized recreation sounds at high- and low-use rates and compared weekly mammal detections with nature-sound controls. Under high-rate motorized playback, every analyzed species except mule deer remained below baseline through the 15-week season; mule deer returned by week six. High-rate non-motorized effects persisted to about seven weeks for other species, while low-rate non-motorized treatments produced seven- to nine-week recovery times.

WHY IT MATTERS / OUR READ

For managers, temporal pattern is part of recreation intensity. A trail can be quiet today and still sit inside a wildlife-response window created by repeated prior use. Where sensitive species and high-use routes overlap, spatial refugia, seasonal limits or use-rate management may matter more than a simple open/closed designation.

CAVEATS / UNCERTAINTY

The experiment isolated acoustic disturbance rather than the full package of people, vehicles, scent and physical trail use. Camera detections measure use or avoidance, not demographic harm, and the 12-site Wyoming experiment should not be converted into universal recovery periods for other species or landscapes.

SOURCE

Biological Conservation / USFS — primary study
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A field playback experiment in Wyoming found recovery time depended on recreation type, exposure rate and species; high-rate motorized noise suppressed detections of most species beyond a 15-week season.

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Government data North America

The U.S. mammal H5N1 detection table is still changing—and still incomplete

Evidence
Government data
Geography
United States
System
Wildlife, captive mammals and avian-influenza surveillance

WHAT THE EVIDENCE SAYS

USDA APHIS updated its mammal HPAI detections page on September 25. The table includes recent 2026 detections in mammals and explicitly warns that data may be incomplete and that additional detections will be added.

WHY IT MATTERS / OUR READ

The useful signal is surveillance breadth, not a claim of sustained mammal transmission. A dynamic cross-species detection ledger helps identify where wildlife, domestic animals and disease-monitoring systems intersect.

CAVEATS / UNCERTAINTY

Detection does not establish onward mammal-to-mammal transmission, population-level impact or a complete incidence picture. The federal table is explicitly incomplete and is updated as reports arrive.

SOURCE

USDA APHIS
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EvidenceGovernment dataGeographyUnited StatesSystemWildlife, captive mammals and avian-influenza surveillance WHAT THE EVIDENCE SAYS USDA APHIS updated its mammal HPAI detections page on September 25. The table includes recent 2026 detections

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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
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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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