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

In 1998 the same significant negative relationship was characteristic of A. agrárius and M. arvalis. The regression curve was similar in A. flavicollis but it was not significant. In the A. syl­vaticus population the growth of the number of individuals was in significant linear correlation with the decrease of patchiness values (Fig. 15). Density/ha Density/ha Fig. 15. Patchiness as a function of density of the four populations in habitat A in 1998 In plot B in 1997 the aggregation of individuals was general in all four species. The values of the index of aggregation decreased in all of the species except for A. sylvaticus which was present constantly in small numbers, thus M. arvalis and A. agrárius appearing as dominant species could cause the growth of its degree of aggreation, by forcing it out from certain locations. In 1998 patchiness values were the highest in May (Fig. 16), which can g T M. arvalis 0 -I 1 1 1 1 1 o -J 1 1 > < 1 nwy June July aug. sept. may june July auf. scpL 1998 Months 1998 Months Fig. 16. Values of the aggregation index of the four populations in habitat B in 1998

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