Vegetation clump size and number as indicators for alternative stable states in semi-arid ecosystems

Vegetation clumps in semi-arid ecosystems are not necessarily linked to bistability, but clump morphology changes with aridity provide reliable indicators of an impending desertification transition.

• Why it matters: Models often predict abrupt desertification via two alternative stable states, yet this bistability has not been confirmed empirically, limiting prediction and management under increasing aridity.
• What they did: The study combines empirical observations with theoretical analysis to test whether clump size or number signals bistability, and evaluates how clump morphology responds as aridity changes.
• The result: Decreases in clump size or number do not necessarily precede desertification; tracking clump morphology with aridity helps distinguish local versus multi-scale feedback mechanisms and implies whether transitions may be abrupt.

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