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Trends and drivers of change in diving ducks

image of Trends and drivers of change in diving ducks

This report addresses changes in population size in five species of diving ducks breeding and wintering in the Baltic Sea. Declines in breeding Greater Scaup, Eider and Velvet Scoters on the Baltic coast are verified. Long-tailed Ducks and Eiders have declined in winter. Breeding Eiders have declined in Norway. Monitoring programs in all Nordic countries are partly inadequate for detecting changes in numbers of birds both in winter and during breeding, but large-scale trends appear reliable. The reasons for the declines observed are largely unknown. For breeding Eiders in the northern part of the Baltic Sea a change in predation regimes on the breeding islands may be important. If the negative trends are to be stopped, a deeper understanding of the drivers involved and better knowledge about the ecological status of the Baltic Sea food webs utilized by the diving ducks are needed.

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Breeding populations of the focal species

This section gives an overview of the current estimates of breeding pair number of the focal species, as well as an indication based on national monitoring schemes on the recent trend for each species. All estimates of breeding numbers and trends are taken from sources which are as up to date as possible. The table also indicates the national IUCN classification of the species.

English

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