L. Forró szerk.: Miscellanea Zoologica Hungarica 12. 1998 (Budapest, 1998)

Farkas, S.: The terrestrial isopod fauna of the Rinya region II. Péterhida

Fig. 2. Taxonomic distribution of the captured species are more than 50 known localities in this country (Forró & Farkas 1998). A. vulgare was observed from all the 32 examined UTM units along the Dráva-Basin (Farkas 1997). T. rathkii is the second most abundant Isopoda species in the willow poplar gallery forests along the Dráva. According to other studies A. vulgare and T. rathkii occur always together in the samples taken from wetland forests of the Dráva, comprising 96% of all the trapped woodlice specimens at Gordisa (Farkas 1998b) and 98% at Mailáthpuszta (Farkas 1995). T. rathkii also inhabits Kőszeg Mts (Kesselyák 1937) and in the Bükk Mts (Allspach 1996). Szlávecz (1991) and Loksa (1973) reported it from Újszentmargita. P. collicola lives in Central and Southern Europe (Schmallfuss 1985). This species is widely distributed in Hungary. It was noted from many parts of the Hungarian Mountain Range (Allspach 1996, Loksa 1961a, 1966, 1971) from the Kőszeg Mts (Kesselyák 1937) and from the Mecsek Mts (Loksa 1966). Allspach & Szlávecz (1990), later Szlávecz (1995) collected it at Bátorliget. Farkas (1998a, b) reported it from Danube-Dráva National Park. It occurs not only in the mountains, but also on the Great Hungarian Plain (Szlávecz 1991). T. ratzeburgi has relatively few distribution data from Hungary. Csiki (1926) and Dudich (1942) mentioned it from Budapest. Loksa (1961b) found it at Vindornyaszőlős. It is known from the Kőszeg Mts (Kesselyák 1937), Mecsek Mts (Gebhardt 1933, 1934, 1960), Bakony Mts (Ilosvay 1983), and from the Dráva-Basin (Lantos 1985, Farkas 1998b). 2. The effect of spatial heterogeneity on the composition of woodlice assemblages There was no significant difference between the average catch per trap for male and nongravid female individuals of A. vulgare and P. collicola. The distribution of gravid females of both species was equal. Traps "a" to "e" caught T. rathkii in significantly lower number than traps "f ' to "j". The abundance of this species increased gradually from trap "e" toward trap "j". Traps "a" to "d" did not catch any gravid females and only one male individual of this species. Few specimens of non-gravid females of T. rathkii occurred in traps "a" to "e". Traps "i" and "j" caught T. ratzeburgi in significantly lower number than traps "a" to "h" (Fig. 3). The amount of gravid females of this species was higher in traps "a" to "e" than in traps "f ' to "j". According to these results two conclusions can be drawn: (1) A. vulgare and P. collicola do not show preference to any plant associations, because the distribution of these species