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Recent climate change has caused comparatively rapid shifts in the phenology and geographic distributions of many plants and animals. However, there is debate over the degree to which populations can meet the challenges of climate change with evolutionary or phenotypic responses in life history and morphology. We report that migrating birds captured at a banding station in western Pennsylvania, USA,...
Ecological processes are changing in response to climatic warming. Birds, in particular, have been documented to arrive and breed earlier in spring and this has been attributed to elevated spring temperatures. It is not clear, however, how long-distance migratory birds that overwinter thousands of kilometers to the south in the tropics cue into changes in temperature or plant phenology on northern...
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