Influencing factors of the occurrence of otters on southern and south-western catchment of Lake Balaton

Lanszki, József and Nagyapáti, Nikolett and Széles, L. Gabriella (2015) Influencing factors of the occurrence of otters on southern and south-western catchment of Lake Balaton. NATURA SOMOGYIENSIS (26). pp. 135-144. ISSN 1587-1908, ISSN 2062-9990 (Online)

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Abstract

The aim of the study was to test the survey method of the otter (Lutra lutra), recommended by the IUCN/OSG on the southern and south-western catchment of Lake Balaton. The survey was performed in winter. 118 out of 144 surveyed locations showed positive presence (81.9%). The otters inhabited all studied stagnant waters (n=36, including 14 sections near Lake Balaton) while it occurred rarely in watercourses (n=108 sites, positive 75.9%). Occurrence of the otters was less frequent along narrower (especially <1 m) water courses, in shallow (<30 cm) water, with declining naturality of the bank side, at pipe bridge or bridge without berm and on the locations where the intensity of the human disturbances was high. The experiences can be used for the conservation program of the otter and in the habitat management plans. With 9 figures.

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