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Factors limiting reproductive success in urban Greylag Geese ( Anser anser )
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Factors limiting reproductive success in urban Greylag Geese ( Anser anser )
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Journal Article
Factors limiting reproductive success in urban Greylag Geese ( Anser anser )
2022
Overview
In the late eighties, Greylag Geese ( Anser anser ) started to colonise an urban area previously void of geese in southwestern Germany. Between 2004 and 2020, in a period of steady population increase with subsequent population stagnation, we analysed two measures of reproductive success: (1) the relation between freshly hatched to fledged young for each brood and (2) the probability of a hatchling to survive to fledging. We were able to show that the dispersal of pairs from the nesting site to a different brood rearing area resulted in higher reproductive success. However, the increasing population size of Greylag Geese and the number of breeding pairs of recently immigrated Egyptian Geese ( Alopochen aegyptiaca ) had a negative impact on reproductive success, indicating density dependence. Our results show that newly established populations in urban settings do not grow indefinitely, which is an important fact that should be taken into account by wildlife managers.
