Przeglądaj wg Autor "Romanowski, Jerzy"

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    The Occurence of the Eurasian Otter Lutra Lutra in Aquatic Habitats of Different Trophy in Wigry National Park
    (Wydawnictwo Uczelniane zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2018) Romanowski, Jerzy; Januszewicz, Małgorzata; Grzegrzółka, Beata; Faculty of Biology and Environmental Studies, Cardinal Stefan Wyszyński University in Warsaw, Warszawa, Poland; Wigry National Park, Krzywe 82, Suwałki, Poland; Department of Genetics and Animal Breeding, Warsaw University of Life Sciences – SGGW, Poland
    The standard method was used for the first field survey of the Eurasian otter Lutra lutra distribution in all aquatic habitats in Wigry National Park (WNP) in northern Poland. Total of 59 study sites (48 on lakes, 8 on rivers and 3 on drainage ditches) were visited twice between 12th and18th of March and between 8th and 13th of May 2018. Signs of otters were found in 42 (71.2%) sites located throughout the whole area of Wigry National Park. The percentage of positive sites reached 100% in mesotrophic and eutrophic lakes as well as in rivers and meliorated canals. No signs of otter presence were recorded in dystrophic lakes located in the centre of peat-bogs. This marked difference in otter occurrence can be explained in the terms of different food availability: high in mesotrophic and eutrophic habitats and low in dystrophic lakes.