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Autumn migration of Ospreys from two distinct populations in Poland reveals partial migratory divide

Avian Research 2021年第4期12卷 442-451页

作者： Dariusz Anderwald Łukasz Czajka Sławomir Rubacha Michal Zygmunt Pawel Mirski Forest Experimental Station in Rogów Akademicka 2095-063 RogówPoland Eagle Conservation Committee Niepodległości 53/5510-044 OlsztynPoland Faculty of Biology University of BiałystokCiołkowskiego 1J15-245 BiałystokPoland.

Background:Long-term ringing and telemetry studies show that the Osprey(pandion haliaetus)is a broad-front migrant following different migratory flyways,depending on the geographical location of their breeding *** have investigated two distinct and declining populations of Osprey in Poland,separated by only a few hundred kilometres,and hypothesised they may exhibit two different migration *** followed mortality causes,comparing them between migration and stationary phases of annual cycle,as well as between two distinct ***:Nineteen Ospreys,both juveniles and adults,were equipped with GPS loggers in 2017-2020 in two populations in western and eastern Poland and followed on their autumn *** calculated the distance they covered on the migration,number of stopover days,migration duration,daily distances covered and departure dates to compare them between age and sex classes and between the eastern and western ***:Ospreys from the western and eastern populations showed a partial migratory *** the first migrated through a western flyway,the second followed a central flyway,resulting in crossing the Mediterranean Sea in distant passes that affected the distance *** mortality reached at least 67%in juveniles and at least 57%in ***:We showed that two distinct Osprey populations in Poland revealed a partial migratory divide,with one covering greater distances over sea and deserts over the central *** might affect individual survival rates and contribute to a steeper decline in one of the *** order for this to be confirmed,more individuals still have to be followed.

关键词： GPS telemetry Mortality pandion haliaetus Stopover

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