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Waterbirds wintering in Germany - trends and population estimates for 1990-2000 Ueberwinternde Wasser - und Watvoegel in Deutschland Bestandsgrossen und Trends ausgewaehlter Vogelarten fuer den Zeitraum 1990-2000

Waterbirds wintering in Germany - trends and population estimates for 1990-2000 Ueberwinternde Wasser - und Watvoegel in Deutschland Bestandsgrossen und Trends ausgewaehlter Vogelarten fuer den Zeitraum 1990-2000

Berichte zum Vogelschutz 40: 91-103

In 1994 BirdLife International published "Birds in Europe - their conservation status" (TUCKER & HEATH 1994). This comprehensive overview on trends and numbers of bird populations in Europe is currently under revision and will be published in 2004. This time also trends and estimates (as minimum-maximum range) for wintering populations on a national level will be included, which are presented here for 70 species wintering in Germany (incl. the Exclusive Economic Zone). 16 species declined between 1990 and 2000, 4 were regarded as stable, 16 as fluctuating (> 20% interannual fluctuation) and 5 showed an increase in population size. For 28 species no information on trends is available. Trends and numbers in some species were heavily influenced by the two consecutive cold winters 1995/1996 and 1996/1997, which followed a series of mild winters in the first half of the 1990s. These trends have to be interpreted cautiously as the period regarded (1990-2000) is relatively short. This compilation and its analyses clearly demonstrate that nationally and internationally coordinated and synchronised counts are very important as a measure for population changes in our rapidly changing landscape.

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