Raymond H. G. Klaassen, Mikael Hake, Roine Strandberg, Ben J. Koks, Christiane Trierweiler, Klaus-Michael Exo, Franz Bairlein and Thomas Alerstam When and where does mortality occur in migratory birds? Direct evidence from long-term satellite tracking of raptors Journal of Animal Ecology 83
The authors use satellite telemetry to describe when and where migratory raptors die during the annual cycle. Daily mortality is six times higher during migration than during stationary periods (breeding and wintering), but total mortality is surprisingly equal between seasons, as ‘dangerous’ migration periods are shorter than ‘safe’ stationary periods.
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