Archives for Gulf Coast Conservation Grants Program

Researchers at the University of Maryland Center for Environmental Science’s Appalachian Laboratory, University of Delaware, Cornell Lab of Ornithology, Colorado State University, Georgetown University, University of Massachusetts and Smithsonian Migratory Bird Center defined a new migration metric called the stopover-to-passage ratio (SPR). Using eight years of data from 12 weather surveillance radars, they found approximately half of the birds migrating through the Gulf of Mexico and Atlantic coasts of the southeastern U.S. stop within 100 km of its coastlines, totaling ~1.2 to 2.0 billion birds each spring and autumn. Further, the drivers of stopover habitat use differed between spring and autumn migration, suggesting seasonal differences in habitat function.