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

HORVÁTH ET AL.: POPULATION DYNAMICS AND SPATIAL PATTERN 197 Table 3: Results of the homogeneity test (G-test) between the two sample areas Grid A Grid В Speies N, Pi Ni P, G-values S. araneus 21 19.26 25 41.66 8.43** C. leucodon 7 6.42 15 25 1.27 C. glareolus 16 14.67 1 1.67 11 89*** M. subterraneus 1 0.91 0 0 11.73*** A. agrárius 14 12.84 4 6.67 1.98 A. flavicollis 49 44.95 15 25 5.77* A. sylvaticus 1 0.91 0 0 1.27 *:p<0.05;**:p <0.01; ,p< 0.001 Table 4: Results of the homogeneity test (G-test) between the two sample areas (August) Grid A vs. Grid В G-values Speies A% B% Sorex araneus Crocidura leucodon Clethrionomys glareolus Apodemus agrárius Apodem us flavico His 0 0 37.25 17.64 45.09 0 3.89 11.68 46.75 37.66 5.40* 1404*** 13.64*** 0.66 *:p < 0.5,**:p < 0.01, ***:/? < 0.001 For a detailed statistical analysis of differences between the two study plots, capture data from 2003 proved to be insufficient. The assumed differences between the areas were thus evaluated based on the cumulated data of 3 months only. From the results of G-tests performed for each species it appears that in most species inhomogeneity was found to exist between the two areas. The two, typically forest-dwelling species that had been more abundant before 2003 (A. flavicollis, С glareolus) were now found to be characteristic for the closed forest, whereas for the distribution of A. agrárius no significant difference was found between habitat types. Apparently, this generalist species was found with similar proportions in the two areas, with individuals of the population moving about in the boundary area between the two plots, i.e. in the edge zones. The significant difference found for the distribution of S. araneus is a consequence ofmerging its data, as it could be seen above from relative frequencies during the months that this species changed location, moving mostly to the regrowing area in August and October. However, the significant result of the G-test cannot clearly prove whether it is the closed alder gallery forest or the regrowing forest area that is the more suitable habitat for this species (Table 3.). The higher number of captures in 2004 made it possible to analyse the assumable difference between the two plots month by month (Tables 4-6.). From G-tests for the various species it appears that there was inhomogeneity for most of the species in all three months between the two plots. For August, the significant G-test results obtained for the striped field mouse and for the bank vole must be noted. The striped field mouse which is capable of fast dispersal, was found to be occurring at significantly higher frequencies in the regrowing area than the 1:1 distribution hypothesised by the G-test., whereas the bank vole was more abundant in the closed forest. Another important phenomenon in the comparison of the two areas in the same month is the homogenous distribution of the yellow-necked wood mouse, showing that the reforested area is also a suitable habitat for this species, and that individuals of the population establish their home ranges here, too (Table 4.).