Site-specific variation in flowering phenology of a spring ephemeral plant and its implications for phenological mismatch with pollinators under climate change.
Liew HX, Kudo G
Phenology
If you watch for the first spring wildflowers pushing up through forest leaf litter each year, you're witnessing a race against time — these plants have only a narrow window to flower, get pollinated, and set seed before the tree canopy closes, and warming winters are scrambling that window in ways the bees haven't caught up with yet.
Siberian corydalis, a delicate spring wildflower, times its blooming to when snow melts — but the bumblebee queens it relies on for pollination wake up from winter sleep based on soil warmth, not snowmelt. When snow disappears unusually early, the flowers open weeks before the bees are ready, meaning many flowers go unpollinated and produce fewer seeds. This research found that plant populations from places with reliably early snowmelt have subtly different genetic 'clocks' for flowering, hinting that plants can adapt — but climate change may be pushing them faster than evolution can keep pace.
Key Findings
Flowering onset was strongly tied to snowmelt date in all four studied populations, with early-snowmelt sites showing greater year-to-year variation in bloom timing across 2020–2024.
Common garden experiments confirmed that populations differ genetically in their heat requirements for flowering, with both genetics and environment interacting to shape bloom timing.
Long-term monitoring showed phenological mismatch (flowers open before bees emerge) significantly reduces seed set, and advancing snowmelt increases the probability of mismatch occurring.
chevron_right Technical Summary
Spring wildflowers that depend on snowmelt to trigger blooming are increasingly flowering before their bumblebee pollinators become active, reducing seed production. This study finds that different plant populations have evolved distinct heat requirements for flowering, which may help some plants better track their pollinators — but advancing snowmelt under climate change is widening the timing gap and threatening reproductive success.
Abstract Preview
Disruption of plant-pollinator interactions occurs when interacting species exhibit different phenological responses to climate change. Flowering of Corydalis ambigua, a spring ephemeral herb growi...
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Corydalis is a genus of about 540 species of annual and perennial herbaceous plants in the family Papaveraceae, native to the temperate Northern Hemisphere and the high mountains of tropical eastern Africa. They are most diverse in China and the Himalayas, with at least 357 species in China. Cory...