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

Table 6. Spearman rank-correlation calculated for MNA values of species-pairs in the Páprád sampling area B in 1997-1998 Trapping years 1997-1998 Species pairs Rs Significance M. arvalis vs. A. sylvaticus 0.72 P < 0.05 M. arvalis vs. A. flavicollis 0.78 P < 0.05 M. arvalis vs. A. agrárius 0.57 NS A. agrárius vs. A. sylvaticus 0.73 P < 0.05 A. agrárius vs. A. flavicollis 0.69 P<0.1 A. sylvaticus vs. A. flavicollis 0.76 P < 0.05 Table 7. Spearman rank-correlation of the two study years based on MNA values of the six species-pairs in the Nagycsány sampling area A Trapping years 1997 vs. 1998 Species pairs R

s Significance M. arvalis vs. A. sylvaticus 0.71 P<0.01 M. arvalis vs. A. flavicollis 0.76 P< 0.001 M. arvalis vs. A. agrárius 0.82 P< 0.001 A. agrárius vs. A. sylvaticus 0.42 NS A. agrárius vs. A. flavicollis 0.7 P<0.01 A. sylvaticus vs. A. flavicollis 0.67 P<0.01 In plot A in 1997 patchiness values were high in the first month of trapping, except for A. agrárius, which had a much lower value in the first month than the rest of the species, though its value was higher than 1.0, which would suggest random distribution (Fig . 12). In the remainmarch apr. may June July aug. sept. oct. maR

'

h a

P

r- ma

y J

unc J

u|

y au

S- SC

P'1997 Months 1997 Months Fig. 12. Values of the aggregation index of the four populations in habitat A in 1997 ing months values were uniformly lower, though they implied aggregation in each case. In 1998 the value of the aggregation index decreased considerably from May onwards in M. arvalis, A. sylvaticus and A. flavicollis, yet they remained above 1.0, indicating aggregation (Fig. 13). In