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
HORVÁTH ET AL.: SMALL MAMMALS 285 Table 1: GPS coordinates of sampling plots and parameters of trapping effort Sampling GP S coordinate 2005 2006 2007 Macrohabital ' 1 5 P lo t N F. TN S C TN S C TN SC Balatoni-berek B 1 46=42'50" 17°11*20" 418 4 46 165 3 17 B 2 46'42'29" 17=ir03" 2057 8 129 BJ 46=42'29" 17°10'54" 847 5 45 keleti-berek KEI 46 42'43" 17 =H'20" 3872 8 244 605 3 10 KE_2 46=42'03" 17 c10'52" 3025 11 149 2079 11 432 1331 8 214 kE_3 46 :42'25" 17 oH'09" 2541 9 246 Halász-rét H 1 46 42'04" 17°15'15" 1474 10 121 3707 10 206 1537 7 50 H 2 46 42"00" 17 ! ;14'51" 120 5 21 Simon-sziget SÍ 46"38'20" 17" 13" 14" 22 2 17 komlósi-berek kt) 1 46 '34'59" 17'13'19" 484 3 45 Ingói-berek 11 46 40'52" 17 C11'22" 2047 9 96 Rózsa-berek Rl 46~35'08" 17°10'25" 688 5 58 TN: trap night. S: number of species. C: capture number of specimens Altogether seven macrohabitats (groves) were studied during the three years which were different in their number of sampling plots and trapping intensity. For each sampling habitat patch we indicated GPS coordinates, the number of trap nights representing trapping effort, the indicated level of species richness (S), and the numbers of small mammal captures (Table 1.). Balatoni-berek The Balatoni-berek is a boggy area stretching between Sármellék and Keszthely, reaching the canal "Eszaki-keresztcsatorna", an "ex lege" protected nature conservation area before 2001 but not part of the Balaton Uplands National Park. A large stretch of the Balatoni-berek in the south, neighbouring the national park was privatized in 2002, meaning that the monitored area in the analysed study years was managed by a private owner. This macrohabitat rose due to the filling up of a former freshwater marshland. These heterogeneous macrohabitats consist of some different degraded sedgy habitat patches, where the high density of Calamagrostis epigeios indicates the negative effects of eutrophication (accumulation of nutrients). The altitudes are increasing uniformly from the reedy part towards the road, which clearly shows the gradual thinning and shrinkage of the common reed's stocks (Phragmites australis). In the period before privatization, it was this boggy area among the sampled macrohabitats that represented habitat patches with the most suitable conditions for the root vole, with undisturbed, homogeneous sedge vegetation and water cover. The very dry period in the Balatoniberek in 2001, and successive human impact i.e. regular hay cutting in 2002-2003 altered the physiognomic structure and vegetation composition of the homogeneous sedgy habitat. The higher amounts of precipitation in 2004 replenished the water supplies of the bog area, preventing the owner from utilising the land, including grass cutting. As a result, vegetation in the area could gradually regenerate itself, allowing us to lay out sampling spots in three regenerated habitat patches in 2005-2007 (B 1, B_2, B 3).
