As regular CFZ-watchers will know, for some time Corinna has been doing a column for Animals & Men and a regular segment on On The Track... particularly about out-of-place birds and rare vagrants. There seem to be more and more bird stories from all over the world hitting the news these days so, to make room for them all - and to give them all equal and worthy coverage - she has set up this new blog to cover all things feathery and Fortean.

Thursday, 25 January 2018

City lights setting traps for migrating birds

19th January 2018

University of Delaware study looks at how birds are drawn to artificial light pollution in urban areas

UNIVERSITY OF DELAWARE

On their fall migration south in the Northern Hemisphere, scores of birds are being lured by artificial light pollution into urban areas that may be an ecological trap, according to the University of Delaware's Jeff Buler.

Buler, associate professor in UD's Department of Entomology and Wildlife Ecology, and his research team used 16 weather surveillance radars from the northeastern United States over a seven-year period to map the distributions of migratory birds during their fall stopovers. The research is published in the scientific journal Ecology Letters.

Since most of the birds that migrate in the U.S. are nocturnal and leave their stopover sites at night, Buler and his research group took snapshots of the birds as they departed.

"Shortly after sunset, at around civil twilight, they all take off in these well-synchronized flights that show up as a sudden bloom of reflectivity on the radar," Buler said. "We take a snapshot of that, which allows us to map out where they were on the ground and at what densities. It basically gives us a picture of their distributions on the ground."

The researchers were interested in seeing what factors shape the birds' distributions and why they occur in certain areas.


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