Ábrahám Levente: Vegyes tanulmányok - Natura Somogyiensis 3. (Kaposvár, 2002)

Vadkerti Edit - Farkas Sándor: The terrestrial isopod fauna of the Rinya region IV. Szilonics-puszta. (Isopoda Oniscidea) - A Rinya régió szárazföldi isopoda faunája IV. Szilonics-puszta

Natura Somogyiensis 3 27-34 Kaposvár, 2002 The terrestrial isopod fauna of the Rinya region IV. Szilonics-puszta VADKERTI Edit and FARKAS Sándor VADKERTI Б. and FARKAS S.: The terrestrial isopod fauna of the Rinya region IV. Szilonics-puszta. Abstract: Isopods of a wetland forest and the surrounding ruderal vegetation were sampled along a line transect by pitfall trapping. The captured 5 species were: Porcellium collicola Verh., Trachelipus ratzeburgi Brandt, T. rathkex Brandt, Armadillidium vulgare Latr. and Hyloniscus riparius Koch.. The number of individuals was much greater than expected. No difference was found between the spatial distribution of the species. T. ratzeburgi was the dominant species in both of the vegetations. The seasonal changes in surface activity, sex ratio and the number of gravid females were also examined. Keywords: Isopod, Oniscidea, Hyloniscus riparius, Porcellium collicola, Trachelipus ratzeburgi, T. rathkei, Armadillidium vulgare, pitfall trapping, Danube-Drava National Park, wetland, spatial distribution, habitat preference, surface activity, sex ratio, population dynamics. Introduction The Danube-Drava National Park is located in South Transdanubia in Hungary and consists of many islandlike natural reserves. The systematic ecological research of the isopods living in the regions of DDNP began in 1996. One of the 61 sampling sites was located at Szilonicspuszta. The main questions of this study were: (1) which Isopoda species live here, (2) whether there is any habitat preference of the different Isopoda species, and how (3) the surface activity (4) the community structure (5) sex ratio and reproductive characteristics of their populations change in time. Fig. 1. The location of the sampling site