Declines amongst breeding Eider Somateria mollissima numbers in the Baltic/Wadden Sea flyway

We report on the status of the Baltic/Wadden Sea flyway Eider population based on trends in breeding and wintering numbers throughout the region, supplemented by changes in the sex ratio and proportion of young Eiders as monitored in the Danish hunting bag. At the flyway scale, total numbers of bree...

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Bibliographic Details
Main Authors: Johan Ekroos, Anthony D. Fox, Thomas K. Christensen, Ib K. Petersen, Mikael Kilpi, Jón E. Jónsson, Martin Green, Karsten Laursen, Anja Cervencl, Peter De Boer, Leif Nilsson, Stefan Garthe, Markus Öst, P. De Boer, Dutch Centre, Field Ornithology, Nl-dg Beek Ubbergen
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2011
Subjects:
Somateria mollissima
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.662.9794
http://ornisfennica.org/pdf/latest/1Ekroos.pdf
Description
Summary:We report on the status of the Baltic/Wadden Sea flyway Eider population based on trends in breeding and wintering numbers throughout the region, supplemented by changes in the sex ratio and proportion of young Eiders as monitored in the Danish hunting bag. At the flyway scale, total numbers of breeding pairs decreased by 48 % during 2000–2009, after relatively stable breeding numbers in 1991–2000. The majority of the population nest in Finland and Sweden, where the number of breeding pairs has halved over the same period. After initial declines in winter numbers between 1991 and 2000, during 2000– 2009, national wintering numbers increased in the Baltic Sea, but decreased in the

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