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Wildflower phenological escape differs by continent and spring temperature
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Wildflower phenological escape differs by continent and spring temperature
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Journal Article
Wildflower phenological escape differs by continent and spring temperature
2022
Overview
Temperate understory plant species are at risk from climate change and anthropogenic threats that include increased deer herbivory, habitat loss, pollinator declines and mismatch, and nutrient pollution. Recent work suggests that spring ephemeral wildflowers may be at additional risk due to phenological mismatch with deciduous canopy trees. The study of this dynamic, commonly referred to as “phenological escape”, and its sensitivity to spring temperature is limited to eastern North America. Here, we use herbarium specimens to show that phenological sensitivity to spring temperature is remarkably conserved for understory wildflowers across North America, Europe, and Asia, but that canopy trees in North America are significantly more sensitive to spring temperature compared to in Asia and Europe. We predict that advancing tree phenology will lead to decreasing spring light windows in North America while spring light windows will be maintained or even increase in Asia and Europe in response to projected climate warming.
Climate change may be inducing phenological mismatches between trees and understory plants. Here, phenological models based on long-term data from herbarium specimens indicate that spring ephemeral wildflowers are more vulnerable to such mismatches in North America than in Eurasia.
