Keller, V. & C. Müller
(* = Kurzbeitrag)
Bestand und Verbreitung des Kormorans Phalacrocorax carbo in der Schweiz und in Europa.
(von 1994 bis 2006 vergeben)
Brutpopulation, Verbreitung, Wachstumsrate der Kolonien, Koloniegrösse,
Schweiz, Neuenburgersee, Genfersee, Bodensee, Langensee
Population size and trend of the Great Cormorant Phalacrocorax carbo in Switzerland and in Europe. The European breeding population of Great Cormorants Phalacrocorax carbo has strongly increased since the middle of the 20th century, mostly as a result of the increase and spread of the inland-breeding subspecies P. c. sinensis. In Switzerland, Great Cormorants bred for the first time in 2001, at the Fanel on Lake Neuchâtel. Since then, the Swiss breeding population increased to 1504 pairs in 2014, distributed over 11 colonies. Lake Neuchâtel and Lake Geneva held two colonies each with a total of 727 pairs on Lake Neuchâtel (48 % of the Swiss population) and 440 pairs on Lake Geneva (29 %). The six colonies on the central and eastern Plateau were smaller and together held 13 % of the national population, the only colony situated south of the Alps 10 %. The size of the colonies in Switzerland is relatively small in comparison to the situation in Europe. Only three colonies contained more than 250 nests. The first Swiss colony has remained the largest, with 427 nests in 2014. Annual growth rate of the Swiss population declined rapidly within the first few years after colonisation to around 25 % in the period 2012 to 2014. Several small colonies disappeared again after a few years or were occupied irregularly. The increase of the Swiss breeding population fits the overall results of the coordinated European census in 2012, which documented a further range expansion of the subspecies P. c. sinensis in Central and Southern Europa but which indicated on the other hand that the European breeding population has hardly changed since the previous census in 2006.
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