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Understanding the dispersal behaviour of a species is important for understanding its ecology and evolution. Dispersal in the Eurasian badger (Meles meles) is believed to be very limited, with social groups forming primarily through the retention of offspring. However, most of our knowledge of dispersal in this species comes from studies of high-density populations in the United Kingdom, where badgers are atypical in their behaviour, physiology, ecology and prey specialization. In this study we use genetic methods to compare dispersal patterns in a British and a Swiss population that differ in their ecology and demography. We present well-supported evidence that badgers disperse much further in the low-density continental population, where dispersal may also be female biased. Limited dispersal thus seems not to be an intrinsic behavioural characteristic of the species. Rather, dispersal patterns seem to vary depending on population demography and, ultimately, habitat quality and characteristics. This could have important management consequences, as dispersal can affect the impact of local extinction, and host dispersal has a particularly important role in disease transmission. Even though concentrated studies of a species in a single location may not provide representative data for the species, there are few mammalian studies that compare demography and dispersal patterns across contrasting habitats. Our results provide an example of phenotypic plasticity and suggest that dispersal is determined by the interaction of individual, social and environmental factors that may differ between populations.

Using genetic methods to investigate dispersal in two badger (Meles meles) populations with different ecological characteristics