Abstract
Wind turbines pose a risk for bat populations. Even offshore wind turbines may pose a risk for bats, as they forage and migrate over marine areas. We modelled offshore bat activity for different Danish seas. Activity was summarised and modelled per night as a presence/absence variable. The analyses indicate a relatively higher probability for bat activity in the inner Danish waters compared to the Danish North Sea. Activity decreased with increasing distance to the coast in the North Sea, but no such effect was observed for the inner Danish waters. Bat activity increased with increasing tem- peratures, with a clear seasonal difference in temperatures where high bat activity occurred. Offshore bat activity decreased with wind speed.