Eastern Monarch Butterflies Delay Migration
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Ecologist finds eastern monarch butterflies delaying fall migration
83% Informative
Ecologist finds eastern monarch butterflies delaying fall migration.
The study was one of several that assessed the effects of climate change on three species of butterflies whose populations are declining.
Monarch butterflies -- including western monarchs, who winter in California and spend summers west of the Rockies -- were recently proposed for listing as threatened under the Endangered Species Act .
Early-season larval survival was higher when the timing of the hatch matched that of the natural monarchs.
Survival was lowest when egg hatching shifted two weeks earlier .
That finding might be relevant for monarch populations in other areas of the eastern range, Debinski said.
The study also revealed that monarch population growth at Camp Dodge declined between 2003 and 2019 .
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