Ábrahám Levente (szerk.): Válogatott tanulmányok VI. - Natura Somogyiensis 19. (Kaposvár, 2010)

HORVÁTH GY., HERCZEG R., TAMÁSI K. & SALI N.: Nestedness of small mammal assemblages and role of indicator species in isolated marshland habitats

284 NATURA SOMOGYIENSIS patches (/'), we examined the composition and structure of small mammal assemblages living in differently isolated patches, (//) we described those habitat patches and animals which showed unexpected presence values, (/'») we evaluated how similar results are produced by the methods of nestedness and IndVal concerning the indicator characteristics of the species, and how could these results be used for qualitatively typifying the marshland habitat patches. Study areas During the period between 2001-2004 within the small mammal monitoring programme having been performed in the Kis-Balaton area for 11 years, the root vole largely disappeared from the HBMS study locations, due to unfavourable weather conditions and associated anthropogeneic effects, and trapping efforts yielded lesser results for other small mammal species as well. With the aim of surveying new habitats suitable for the ecological requirements of the root vole, and to search for new populations of this strictly protected species, sampling was performed with increased trapping investment in the successive 3 years (2005-2007). Thus, new habitats were designated compared with former population-level monitoring, and trapping frequency was increased too. In the present study our data collected between 2005-2007 in isolated macrohabitats of the Kis-Balaton area are analysed (Fig. 1.) Material and methods Balatoni-berek B2 B 3 • • . "J Fig. 1: Distribution of the investigated seven macrohabitats and different sampling plots in the Kis-Balaton Protected Area