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

VADKERTI Б. & FARKAS S.: ISOPODA 33 ••••••••• males - • -° - • non gravid females gravid females distribution of male and female individuals (%) 06.07. 06.21. 07.06. 07.31. 08.19. 09.10. 09.27. 10.25. 11.15. date of emptying of the traps Fig. 8. Seasonal changes in the amount of male, gravid and non-gravid female individuals of A. vulgare centage of the males ranged from 15 to 45. DANGERFIELD and HASS ALL (1994) found the amount of male individuals of A. vulgare between 17-80 %. At Szilonicspuszta the participation of males for every species ranged from 10 to 50 %. Comparing our results to other findings it can be concluded that probably the relatively high average temperature during the vegetation period and the appropiate humidity resulted in the outstandingly high number of individuals. In this ecological environment, under favorable temperature conditions plenty of juveniles can grow up. As we mentioned, in the habitats there was no observable leaf litter, so the reason the low proportion of gravid females (as had been expected) must be the lack of suitable food. Acknowledgments The research was sponsored by the Bolyai János Research Scholarship (BO/00304/01) of the Hungarian Academy of Sciences. Acknowledgments are due to Miss Mónika Szabadi and Sándor Bérces for technical assistance.