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Ecological Intelligence

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Ecological Intelligence / Subject

tropical forests

Peer-reviewed Latin America & Caribbean

A tropical forest retained fruit-eater species while their visits changed

Evidence
Peer-reviewed
Geography
Three forest sites, French Guiana, South America
System
Tropical fruiting trees; frugivore visitation; forest disturbance

WHAT THE EVIDENCE SAYS

Sixty camera traps documented visitors to two Virola tree species across mature protected, formerly exploited and currently disturbed French Guiana forest sites. Canopy and understory visitor richness remained broadly similar, but ground-dwelling frugivore visits were substantially fewer at the currently disturbed site, while arboreal visitation and community composition shifted.

WHY IT MATTERS / OUR READ

A biodiversity inventory can stay impressive while the frequency and identity of potential ecological interactions change. For restoration and timber-land decisions, animal visitation, guild structure and actual seed dispersal warrant attention alongside species lists.

CAVEATS / UNCERTAINTY

Three nonrandomly selected sites and visitation observations cannot isolate logging, hunting and road effects or directly demonstrate reductions in viable seed dispersal. Findings are site- and fruit-tree-specific.

SOURCE

Ecology and Evolution · French Guiana frugivore camera-trap field study
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French Guiana camera traps expose a functional difference hidden by species-richness totals.

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Peer-reviewed Global

Tropical forests' canopy-water buffer could weaken as atmospheric drying intensifies

Evidence
Peer-reviewed
Geography
Pantropical forest regions
System
Tropical forest carbon–water interactions

WHAT THE EVIDENCE SAYS

Researchers integrated satellite, flux-site and climate-model products. Historical analysis for 2001–2015 suggested canopy water moderated ecosystem water-use-efficiency declines by about 18% under atmospheric aridity and 9% under soil drought; late-century simulations projected much weaker atmospheric buffering.

WHY IT MATTERS / OUR READ

Tree-cover persistence may mask diminishing physiological capacity, so ecological resilience assessments should connect canopy function and climate exposure.

CAVEATS / UNCERTAINTY

The late-century decline—including a projected 88% reduction in the modeled buffering function—is scenario- and model-dependent, not measured future dieback or a forest-by-forest forecast.

SOURCE

Water Resources Research — primary remote-sensing and scenario study
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Observation-based modeling found water held in canopies moderated past declines in photosynthetic water-use efficiency, but that benefit declined in projections.

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Peer-reviewed Global

Tropical rainforests lost 18% of undisturbed cover since 1990 while edge exposure increased

Evidence
Peer-reviewed
Geography
Pantropical rainforest regions, 1990–2023
System
Tropical rainforests

WHAT THE EVIDENCE SAYS

Annual tropical land-use maps from 1990–2023 indicate an 18.1% loss of undisturbed rainforest cover. Losses were uneven: about 25% in Asia, 14.8% in Africa and 14.5% in the Americas, with especially large regional declines in Southeast Asia, West Africa, the Amazon deforestation arc and Central America. The area of remaining forest within 100 metres of an edge increased by about 6.6%, showing that fragmentation rose alongside outright loss.

WHY IT MATTERS / OUR READ

Forest area and forest configuration are different conservation variables. A landscape can retain mapped rainforest while exposing more of it to edge-related changes in microclimate, disturbance and access. Monitoring only net area can therefore understate how much interior habitat and ecological continuity have changed.

CAVEATS / UNCERTAINTY

The analysis depends on remote-sensing classifications and a fixed 100-m edge-distance metric. Edge exposure is a structural proxy, not a direct measurement of biodiversity loss or microclimatic change at every site.

SOURCE

Scientific Reports · Original evidence
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Annual land-use maps show forest loss and fragmentation moving together across the tropics, with especially large declines in Southeast Asia and West Africa.

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