Phenological mismatches between larks and grasshoppers induced by climate change degrade a grassland ecosystem through trophic cascades.
Fang M, Lu G, Zhu N, Zhu B, Zhang S
Phenology
The meadow grasses and wildflowers in nature reserves near you depend on birds arriving at exactly the right moment to keep insect populations in check — and warming springs are quietly dismantling that timing.
Larks time their nesting so their chicks hatch just when baby grasshoppers are small and easy to eat. As springs warm, grasshoppers emerge earlier while larks don't adjust as quickly, leaving a window where grasshoppers run unchecked. When researchers blocked birds from an area for three years, grasshoppers multiplied, ate far more plants, and left the soil in worse shape — showing that this timing mismatch alone can unravel a whole grassland.
Key Findings
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.
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.
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.
chevron_right Technical Summary
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.
Abstract Preview
Global climate change has led to phenological mismatches between birds and insects across natural ecosystems. However, their effects on ecosystems remain poorly understood. Here we show whether cli...
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