Comparison of the feeding habits of Eurasian otters on a fast flowing river and its backwater habitats

摘要: Abstract The diet and feeding habits of Eurasian otters Lutra lutra were studied by spraint analysis over a 2- year period, on three sections the Drava River backwaters, in south-west Hungary. primary food was fish (mean: 89.8% 87.5% for riverine backwater habitats, respectively); living habitats compared to consumed more birds (3.9% 0.7%, respectively), less mammals (0.5% 0.9%, reptiles amphibians (5.6% 10.2%, respectively) invertebrates (0.1% 0.6%, respectively). In preyed frequently larger than but main prey small-sized (below 100 g weight, 85.6% 91.7%, On river they reophil (flow preferring fish, 18.9% 3.3%, stagnophil (stagnant waters preferring, 9.8% 24.5%, backwaters. eurytopic (tolerant rivers stagnant waters, 71.3% 72.2%, Preference (by Ivlev's electivity index, E i ) various guilds differed, as preferred ( = 0.30) 0.24), avoided =−0.58). Otters did not threaten rare, flow species consisted economically unimportant species.