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Stomach and intestine contents of 211 American mink Mustela vison Schreber, 1777 from two areas (Thy and Bornholm) in Denmark and stomach contents of 47 polecats M. putorius Linnaeus, 1758 from Thy were analysed. Sympatric mink (from Thy) preyed mostly on mammals (55% occurrence), followed by amphibians (36%), birds (33%) and fish (30%), whereas polecat preyed mostly on amphibians (87%) and mammals (34%), and only occasionally on birds (9%) and fish (6%). Allopatric mink (from Bornholm) preyed mostly on birds (50%), followed by mammals (42%), fish (25%) and amphibians (4%). With the possible exception of some amphibians, no endangered species were found in their diet. No differences were found in food composition between wild and escaped farm mink. The concern that mink in general might have a detrimental effect on its prey species and other mustelids in terms of food competition in Denmark may be unjustified. It cannot be ruled out, however, that mink may locally have a seriously negative effect on some specific prey species, and clearly, more data is needed on eg prey abundance and spring and summer mink diet, to make stronger conclusions.
Allozymic variation was surveyed in 21 European polecats Mustela putorius Linnaeus, 1758 from western France, using starch gel electrophoresis. Fourteen loci were success­fully examined and genetic variation was detected at 28.6% of the loci at the 0.05 level. Heterozygosity level averaged 0.082. European polecats from western France clearly showed significant levels of genetic variability. This result contrasts with previously reported analyses from Danish populations.
Radiotracking of three couples of polecats Mustela putorius Linnaeus, 1758 in wetlands of western France showed that the monthly home ranges of male averaged 0.426 km2 and overlapped the females' ranges which were smaller (0.125 km2). Although the distribution of polecat's localizations in the three main habitats differed significantly between the male and the female, the seasonal overlap of habitat niches (Cjk) was considerable and varied from 0.727 to 0.894. The proportion of simultaneous localizations on the same square averaged 4% of monthly localizations while 96% of the localizations indicated solitary activity. Also, the duration of time occuring together was short: only 1.8 days per month on average. The observations suggested that the social organization of M. putorius was characterized by periodic variations of intra- specific tolerance between males and females which were probably influenced by hormonal factors during spring and by food availability during summer and autumn. A strong spatio-temporal segregation, however, determined a particularly individual exploitation of the space.
Food habits of European polecat Mustela putorius Linnaeus, 1758 and of American mink Mustela vison Schreber, 1777 are compared by analysis of scats collected from two radiotracked animals in a marsh habitat over a 5 month period. Both predators take a wide range of prey but polecat consumes more rodents and feeds upon am­phibians in spring, whereas mink mainly preys on fish and birds. Dietary overlap results from the common utilization of rodent prey. Both predators reduce competition by intensive exploitation of different resources and by segregation in the space use.
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