These flight delays come at a steep price.
. It now takes the birds longer to get into the physical condition needed for the rigors of migration. Climate change is also causing the plants to bloom sooner and the insects to emerge sooner on the breeding grounds.
“On average, migratory songbirds only live a year or two, so keeping to a tight schedule is vital. They’re only going to get one or two chances to breed,”. “Longer lived birds are less likely to take the risk of speeding up migrations because they have more chances throughout their lives to breed and pass on their genes.”
The team from Cornell University, the University of Maryland, and Georgetown University used 33 years of American redstart migration departure data in tandem with automated radio tracking and light-level tags. They compared the birds’ expected departure date with their actual departure date to see how it has changed over time.
Activities at the redstart’s wintering grounds, such as not having enough food to eat, also carry over into the bird’s breeding season. While the redstart population is stable and increasing in much of its breeding range,“The good news is that birds are able to respond to changes in their environment,”
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