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Ecological Intelligence

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Ecological Intelligence / Subject

Land-use change

Peer-reviewed Asia

Cropland expansion may cross nonlinear drought-risk thresholds in an agro-pastoral ecotone

Evidence
Peer-reviewed
Geography
Horqin Sandy Land, northern China
System
Agro-pastoral ecotone

WHAT THE EVIDENCE SAYS

Across 50 spatial grids spanning a broad cultivated-land fraction, the study identified nonlinear breakpoints between cropland expansion and drought-related indicators. At high cultivated fractions, modeled drought stress and drought–heat co-occurrence increased sharply rather than changing in a simple linear way.

WHY IT MATTERS / OUR READ

Land conversion can create threshold behavior that is invisible to average trend lines. That is relevant to working-land planning because landscape composition may alter climate vulnerability before a conventional land-use cap is reached.

CAVEATS / UNCERTAINTY

This is a space-for-time observational analysis rather than a controlled longitudinal conversion experiment. Reported thresholds are model-dependent and should not be treated as universal regulatory breakpoints.

SOURCE

Ecological Processes — primary spatial risk study
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A space-for-time analysis in northern China found drought and compound heat–drought risk increasing nonlinearly as cultivated land occupied more of the landscape.

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Peer-reviewed Latin America & Caribbean

Patagonia’s burrowing parrots are eating a diet dominated by introduced plants

Evidence
Peer-reviewed
Geography
El Cóndor, northeastern Patagonia, Argentina
System
Patagonian steppe / coastal parrot foraging landscape

WHAT THE EVIDENCE SAYS

Fecal DNA metabarcoding across the annual cycle of a Burrowing Parrot colony detected 202 plant molecular operational taxonomic units. About 40% were introduced and another 4.5% presumed introduced, while roughly 13% were native; diet diversity was highest in the post-breeding period.

WHY IT MATTERS / OUR READ

A species can persist while its food web changes around it. Diet flexibility may buffer land-use change, but heavy use of introduced plants should not automatically be interpreted as equivalent habitat quality or evidence that native foraging resources no longer matter.

CAVEATS / UNCERTAINTY

Metabarcoding detects plant DNA rather than consumed biomass, energetic value or fitness benefit and may not identify the route by which every plant entered the diet. This is one colony, and the study cannot determine whether the shift reflects adaptive flexibility, necessity or a suboptimal diet.

SOURCE

The Science of Nature
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Year-round fecal metabarcoding found only a small native share of detected plant taxa, a striking shift that could signal flexibility—or a poorer substitute.

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