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

194 NATURA SOMOGYIENSIS Results In the two year period (2003-2004) within the monitoring in Lankóci-forest, analysed in the present paper, a total of 9 small mammal species were found to occur in the trapping grid set up in the protected alder gallery forest and in the neighbouring regrowing area (both the scientific names of species, and their abbreviation used in our database are indicated): MAMMALIA Insectivora: Soricidae: 1. Sorex araneus (Linnaeus, 1758) [SAR] 2. Crocidura suaveolens (Pallas, 1811) [CSU] 3. Crocidura leucodon (Hermann, 1780) [CLE] Roden tia: Muridae: Arvicolinae: 4. Clethrionomys glareolus (Schreber, 1780) [CGL] 5. Microtus arvalis (Pallas, 1779) [MAR] 6. Microtus subterraneus (de Sélys Longchamps, 1836) [MSU] Murinae: 1. Apodemus agrárius (Pallas, 1771) [AAG] 8. Apodemus flavicollis (Melchior, 1834) [AFL] 9. Apodemus sylvaticus (Linnaeus, 1758) [ASY] In 2003 a much lower number of animals were captured in Lankóci forest than the average of earlier monitoring years, which was even more pronounced in the number of recaptures. Therefore, it was not possible to make seasonal population size estimations, not even with closed population models. Among earlier years, the number of captured species was 8 in 2000-2001, which dropped to 6 in 2002. In 2003, despite the fact that there were two sampling grids that year (which doubled the number of trap stations), there were 7 species in the closed forest section (Grid A), and 5 species in the regrowing plot (Grid B). Although 2004 was a more favourable year in terms of weather (lush vegetation, sufficient amount of available food), only 5 species were found to occur in the closed forest. Two protected shrew species (S. araneus, С leucodon) reappeared in the area, thus the number of shrew species was the same as in the previous year, and together with earlier years (2000-2002), we found 5 protected native shrew species in the study area. As to rodents, 5 species were captured in 2003: besides the three wood mouse species, a colouring element of the community, i.e. the pine vole, (M subterraneus) was also captured, as well as the bank vole (C. glareolus) that had strikingly high density values in former years. In 2004, however, the common wood mouse {A. sylvaticus) was not revealed, and only one vole species, i.e. the bank vole was found to be present. Although the latter species started to stabilise again, it was still not abundant enough to be able to become the dominant species. The yellow-necked wood mouse {A. flavicollis) continued to be the leader one in the ranking of dominance in 2004, in both of the small mammal communities sampled (Tables 1-2.). The relative frequencies of the three common rodent species {A. agrárius, A. flavicollis, C. glareolus) and of the two common shrews (S. araneus, C. leucodon) in the studied months differed in both years between the closed alder gallery forest and the regrowing area. In 2003 the proportion of A. agrárius in the protected forest was highest in August, this species showing up in the closed forest in the autumn as well, although with lower frequency. In the regrowing plot this animal appeared in the two summer months