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
1998, totaling 9680 trap nights. However, the area near the village Páprád (area B) went into private ownership in the meantime, allowing us only limited access to it: in 1997 there were three months (September, October, November), while in 1998 there were five months (from May through September) of 5-night trapping, all in all yielding 4840 trap nights. Statistical methods From the total number of captures we calculated the percentage rate of insectivores (Insectivora), rodents (Rodentia), and within those the percentage of genera, in both areas. For the characterisation and comparison of the small mammal communities in the two areas, data of corresponding months were used. Shannon-Wiener diversity and evennes of the sample areas were calculated (Pielou 1975). For the comparison of diversity values we applied t-test, and, with the help of Rényi's formula, diversity ordering was also carried out (Tóthmérész 1995, 1997). For these calculations the software package NuCoSA 1.0 was employed (Tóthmérész 1993, 1996). Capture data were stored in a database and were analysed using the Manly-Parr diary-of-captures method. In both habitats MNA (minimum number alive) values were calculated for the four character populations (Petrusewitz and Andrzejewski 1962, Krebs 1966, Boonstra & Krebs 1978, Halle 1991). In the four dominant species population trends were compared in species-pairs, using Spearman rankcorrelation (Zar 1996). We also looked at the spatial distribution of individuals of the four populations in the two areas. For this purpose Lloyd's patchiness values (Lloyd 1967) were calculated for each month, as the quotient of mean crowding and mean density. If its value equals 1.0, individuals are randomly distributed. If patchiness is higher than 1, individuals of the population show aggregation, while in the case of values lower than 1, they are considered to be segregated. Regression analysis was used to test how the index of aggregation was correlated with the experienced changes in population sizes. Results Faunistical analysis of two abandoned field areas During our trappings in site A we recorded 7 small mammal species from March to October 1997, and 8 species in the corresponding period of 1998: 2 species belonged to the order Insectivora, and 6 belonged to Rodentia (Tables 1-2). Table 1. Capture and recapture numbers in the trapped species in habitat A, 1997 (N c : number of captures, N rc : number of recaptures) Month March Apr. May June July Aug. Sept. Oct. Species Capture parameter N N N„ N r „ N c rc c N rr N„ rc c N c N rc N c N rc N rc Insectivora C. suaveolens - _ _ _ - 1 3 C. leucodon 1 1 Rodentia M. arvalis 15 1 - 4 1 12 <•) 11 15 59 17 40 40 52 48 A. agrárius 15 6 1 - 3 3 12 11 4 59 23 40 12 52 28 A. flavicollis - 3 1 5 1 8 5 17 6 12 4 29 11 65 4! A. sylvaticus 8 1 1 - 10 6 20 24 9 19 9 31 16 27 13 M. minutus 2 M. spicilegus - - - 3 1 4 2 7 5 3 1 4 2 -
