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Queen's University


cuckoo.jpgBiology graduate student Vanya Rohwer and his co-authors discover dual breeding ranges for at least 5 species of North American migratory songbirds.

Neotropical migratory songbirds are typically thought to breed in temperate North America then migrate long distances to spend the winter in Central or South America. Using stable isotopes, we provide the first evidence of a second breeding range for 5 species of migratory songbirds. These species first breed in temperate North America then migrate to the monsoon region of west Mexico where they breed a second time before migrating to their wintering areas. This is the first description of dual breeding ranges for migratory songbirds in North America, and has important implications for life-history evolution and conservation of migratory birds.  

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