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
286 NATURA SOMOGYIENSIS Keleti-berek Keleti-berek is located south of Road 76, being part of the Balaton Uplands National Park, and as such, of the Natura 2000 habitat network. The macrohabitat is characterized by homogeneous sedge beds with only a few non-continuous small reed patches. It is a low, rarely double-leveled reed-meadow, where the dominant species of the vegetation is the lesser pond sedge (Carex acutiformis ). Further down the area is characterized by higher water availability. Between 2001 and 2003 habitat qualities in this area, too, were greatly determined by the drier weather period together with negative human impacts (burning, grass cutting). Due to rainier weather in 2004, vegetation in the area could regenerate. The quality improvement of habitats was partly due to negotiations with national park staff regarding locations of habitat management activities, i.e. only vegetation patches dominated by the invasive Solidago gigantea were cut down in the following years. In the monitoring period between 2005-2007 in the Keleti-berek, sampling spots were designated in three habitat patches (KEI, KE_2, KE 3). Halász-rét Halász-rét is a microhabitat patch in the northeastern part of the Kis-Balaton Landscape Protected Area, towards the village Balatonszentgyörgy. Sampling locations (H I, H 2) were laid out about 100 m west of the river Zala. The mosaic-like mixture of patches including homogeneous sedge, deeper areas with reed and elevated, drier areas dominated by Solidago contributed to an increased macrohabitat heterogeneity. Water cover in the Halász-rét area is to a great degree determined, besides precipitation, by water management in Stage 2 of the Kis-Balaton Water Protection System. From the point of view of small mammals, i.e. in the spring-autumn period, the most important abiotic constraint factor was changes in water level, as evoked by the combined effect of water management and weather. Simon-island Simon-island is one of the largest islands, with the most variable vegetation cover, located in the eastern part of Stage 2 of the Kis-Balaton Water Protection System. Its northern part is covered by forests (locust maple, oak), whereas in its southern parts there is an abandoned pasture with scattered hawthorn bushes, used currently as a hayfield. In its higher elevations along these areas there are edge zones with Solidago cover. The perimeter of the island is lined by a zone of tall tussock sedge, with as high as 50-100 cm water cover under rainy weather conditions. The sampling location was designated in the homogeneous tussock sedge area east of the forest-covered part of the island (S_l). Komlósi-berek Komlósi-berek is located in the southernmost part of Stage 2 of the Kis-Balaton Water Protection System, between the water buffalo reserve of Kápolnapuszta and the village of Sávoly, where the sampling plot (KO_l) was laid out in a large expanse of homogeneous tall-sedge vegetation. This area extends towards the north to the village Főnyed, with the physiognomic structure of its vegetation potentially suitable for supporting subpopulations and populations of the strictly protected root voje. However, our experience showed that one of the most important ecological constraint factors influencing small mammals and their dispersion was the rapidly changing levels of water cover.
