L. Forró szerk.: Miscellanea Zoologica Hungarica 13. 2000 (Budapest, 2000)

Horváth, Gy.; Pintér, V.: Small mammal fauna of two abandoned field habitats, and a spatio-temporal analysis of four rodent populations

A. agrárius march apr. may June July aug. sepl. oct. march apr. may June July aug. sepl. net. 1998 Months 1998 Months march apr. may June July aug. sept. oct. march apr. may June July aug. sept. Oct. 1998 Months 1998 Months Fig. 13. Values of the aggregation index of the four populations in habitat A in 1998 A. agrárius it was highest in May, then it abruptly dropped to around 0, and in the second half of the summer the values indicated that individuals were segregated. An aggregated distribution had re-established itself by autumn. From the above it appears that individuals of the populations were clustered, which phenomenon remained characteristic even at high densities in the autumn. We tested for correlation between patchiness values and the number of individuals per hectare in all four species. In plot A in 1997 significant negative non-linear correlation was revealed by regression analysis for each of the species except for A. flavicollis (Fig. 14). 0 -\ 1 1 1 H 1 0 -I 1 1 1 1 1 0 10 20 30 40 50 0 5 10 15 20 25 Density/ha Density/ha Fig. 14. Patchiness as a function of density of the four populations in habitat A in 1997