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- Title
RE-COLONISATION OF THE EURASIAN OTTER (Lutra lutra) IN THE HRON RIVER CATCHMENT (SLOVAKIA) - A PRELIMINARY REPORT FROM A SURVEY, OR WHO REINTRODUCED THE OTTER IN THE HRON RIVER AND WHY?
- Authors
URBAN, Peter
- Abstract
The Eurasian otter (Lutra lutra) is widely distributed in Slovakia. The population of this species markedly decreased during the 20th century. In the last two decades an increase and a colonizing tendency of the population species range have been registered. A similar trend took place in the Hron River catchment. The modified standard IUCN/OSG method for monitoring of the Eurasian Otter population was used in three field censuses of the otter distribution in the Hron River catchment. Results were obtained at two resolutions, an approximately 10×12 km grid from the "Databank of Slovak Fauna (DSF)", corresponding to 48 quadrates and higher resolution resulting from the subdivision of the first grid corresponding to 152 quadrants of approximately 2.5×3km). During the first survey (in winter of 1995/1996) 35 quadrates (72.9 %) and 73 quadrants (48.0 %) were positive. During the second survey (in summer and autumn of 2010) 45 quadrates (93.7 %), or 116 quadrantes (76.3%) were found positive. During the third mapping (in winter of 2011/2012) 45 quadrates and 120 (78.9%) quadrates were positive. Results of two recent regional surveys (2010, 2011/2012) documented an increase in percentage of positive sites for otter and an increase in the range occupied by otters in the Hron River catchment when compared to that in 1995/1996. The increase was most pronounced in the central part of the catchment and probably related with improvement of the surface water quality in 1980s and 1990s.
- Subjects
HRON River (Slovakia); LUTRA lutra; SPECIES; WATERSHEDS; LUTRA
- Publication
IUCN Otter Specialist Group Bulletin, 2013, Vol 30, Issue 2, p78
- ISSN
1023-9030
- Publication type
Article