Abstract
Two populations of the pipistrelle bat Pipistrellus pipistrellus in southernmost Sweden were studied for eight consecutive breeding seasons using bat boxes. The population living in the vicinity of an industrial area had a declining population trend when compared to that form a rural area. Mass indices in September, when fat accumulation prior to hibernation has started, were also lower compared to those obtained in the rural area. The levels of organochlorine residues and of cadmium were also higher in the population living close to the industrial area. The proximate cause of the decline, however, is assumed to be deteriorating feeding conditions due to drainage and water pollution.
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