A total of 2,395 hybrid records were obtained from Central Europe [Austria (N = 45), Belgium (N = 229), Germany (N = 1,628), France (N = 82), Netherlands (N = 9), Switzerland (N = 392), other countries (N = 10)]. Diving duck hybrids were most common (60%) followed by those of geese. Records of hybrids increased significantly between 1934 and 2006. Crosses of indigenous species made up 1,795 of all records and 600 records were crosses with at least one non-native or alien invasive species. Hybrids within the genera Anas, Aythya and between diving and dabbling ducks occurred more often between indigenous species than expected, while geese hybrids occurred more often with non-native species. Aythya hybrids showed a clear seasonal pattern with a peak of numbers during midwinter while most of the Anser hybrids are rather sedentary. Increases in hybrid records may be due to increased use of field guides and number of observers.
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Vol. 31 • No. 1