Ábrahám Levente: Biomonitoring a Dráva folyó magyarországi szakasza mentén 2000-2004 - Natura Somogyiensis 7. (Kaposvár, 2005)

Horváth, Gy., Molnár, Dániel - Csonka, Gergely: Population dynamics and spatial pattern of small mammals in protected forest and reforested area - Kisemlősök populációdinamikája és térbeli mintázata védett erdei és újraerdősödő területen

204 NATURA SOMOGYIENSIS Fig. 7.: Space use and spatial overlap by the three frequent species after the density peak in 2004 in the alder gallery forest and in the regrowing forest structural factors of floodland forests, or considerable water cover) acting as environmental disturbance can transform quantitative characteristics of small mammal populations and their spatial patterns. In the case of small mammals acting as indicator species, positive or negative changes in the quality of habitats are signified by transformations in the structure of their populations and communities. In the first three years (2000-2002) of small mammal monitoring in Lankóci-forest in the upper Hungarian reach of river Drava we had samplings only in the strictly protected closed alder gallery forest where 8 small mammal species (5 rodents and 3 shrews) were recorded. The results of that trapping period have already been compared in our other papers with data from a long-term monitoring in a lowland oak-hornbeam forest (Bükkhát-forest, Baranya county) where the 10-year investigation yielded occurrence data of a total of 10 small mammal species (HORVÁTH et al. 2004). These 8 and 10 species, respectively, that were shown in our investigations can be regarded as good results: both the drier lowland oak forest and the alder bog forest studied in the upper Drava reach are quite diverse if compared with surveys of small mammal communities of other European temperate forests. As part of the IBP programme, JENSEN (1975) made surveys in beech forests and recorded 8 species (2 shrews and 6 rodents). HAFERKORN (1994) recorded 6 species in ash-elm gallery forest, but due to the insufficiency of data, for several years he could track the dynamics of three populations only. JUCHIEWICZ et al. (1986) performed small mammal community investigations in beechwoods and pine