A decade-long study in China found that warming springs are causing larks and grasshoppers to fall out of sync — when birds hatch too late to control young grasshoppers, grasshopper populations explode, stripping grasslands of plant diversity and productivity.
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A 10-year survey (2014–2024) documented significant phenological mismatches between lark hatching and grasshopper nymph emergence in Inner Mongolia grasslands, with April mean temperature as the strongest driver.
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The phenological mismatch index explained more of the year-to-year variation in net primary productivity (plant growth) than climate variables alone, and NPP declined as the mismatch grew larger.
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A 3-year bird-exclusion experiment confirmed the mechanism: removing lark predation caused grasshopper abundance to surge, leading to measurable declines in plant species diversity, aboveground biomass, and soil quality.
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