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Ecological Intelligence

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Ecological Intelligence / Subject

ecosystem function

Global

Drought makes biodiversity's productivity effects diverge between grassland and forest

Evidence
Peer-reviewed experimental synthesis
Geography
Global grasslands and forests
System
Grasslands and forests / primary productivity

WHAT THE EVIDENCE SAYS

Across 75 biodiversity experiments, diversity most strongly enhanced grassland productivity during extreme drought in more arid locations. Forest responses were limited under similar events, with no comparable aridity interaction for heat or detectable soil-nutrient effect.

WHY IT MATTERS / OUR READ

A single biodiversity-resilience multiplier is unsuitable across biomes; rainfall regime and stress type matter.

CAVEATS / UNCERTAINTY

Productivity is only one ecosystem service and experiments differ; results do not guarantee persistence through repeated future extremes.

SOURCE

Nature Ecology & Evolution · experimental meta-analysis
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A 75-experiment synthesis reports stronger diversity protection under drought in more arid grasslands.

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Peer-reviewed Latin America & Caribbean

As elevation rose in Costa Rica, dung-beetle diversity and dung removal fell together

Evidence
Peer-reviewed
Geography
Talamanca mountain range, Costa Rica
System
Tropical montane forest

WHAT THE EVIDENCE SAYS

Field sampling across 10 sites spanning roughly 440–3,200 m in Costa Rica’s Talamanca range found strong elevational turnover in dung-beetle assemblages. Abundance, species richness and functional diversity declined with elevation, and measured dung-removal rates declined in parallel, connecting taxonomic and functional reorganization with decomposition-related ecosystem function.

WHY IT MATTERS / OUR READ

The useful signal is that biodiversity change and ecosystem process can move together along climate gradients—but the functional pathway is carried by community composition and traits, not simply species count.

CAVEATS / UNCERTAINTY

Elevation bundles temperature, moisture, vegetation, resource supply and other environmental changes, so this observational gradient cannot isolate a single cause. Dung-removal assays measure one function over a bounded period and may not represent all decomposition or nutrient-cycling outcomes.

SOURCE

Biotropica — primary study
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Across a tropical mountain gradient, beetle abundance, richness, functional diversity and dung removal all declined with elevation, linking community change to an ecosystem process.

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Peer-reviewed Latin America & Caribbean

A forest fragment can help a stream even when the rest of the reach is farm country

Evidence
Peer-reviewed
Geography
Espírito Santo, Brazil
System
Headwater agricultural streams / Atlantic Forest

WHAT THE EVIDENCE SAYS

Across 16 reaches in eight agricultural catchments, upstream forest fragments reduced sediment, moderated temperature and increased substrate diversity downstream, while downstream forest reaches supported recovery in invertebrate community attributes. Leaf-litter experiments also showed context-dependent effects on decomposition.

WHY IT MATTERS / OUR READ

Riparian protection can have effects that propagate beyond the mapped forest polygon. Placement along the flow network matters as much as simply counting wooded reach length.

CAVEATS / UNCERTAINTY

Only eight catchments and four replicates of each reach configuration were studied, so causal generalization is limited. The results are from one Atlantic Forest agricultural landscape and do not quantify every water-quality or biodiversity outcome.

SOURCE

Oecologia
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Eight Atlantic Forest catchments show upstream and downstream forest fragments buffering different parts of the ecological response to agricultural riparian loss.

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