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
28 NATURA SOMOGYIENSIS Material and methods Szilonicspuszta is located 8 km west of Bares (Fig. 1). The average temperature of the examined area in July is 21-22 ° С and in the vegetation period (between 1 st of April and 30* of September) is 17-18 °C. The annual precipitation is 700 mm. The studied area consists of two habitat types: a wetland forest and an inundation ruderal vegetation which was a dense Solidago canadensis association. Five pitfall traps were placed in each of them. All of them were set in a 45-meter line transect. The distance between the traps was 5 meters. The transect started inside the forest and perpendicularly crossed the edge, ending in the ruderal vegetation. The leaf litter in the habitats was sparse. The material was collected between 7* June 1996 and 15* November 1996. In spring the examined area was so wet that the experiment could not be begun until 1 st May. The data were standardized to analyse sesonal changes in surface activity by the equation: N/d*t w , where N = number of individuals in one sample, d = number of days between two checkings, and t w = number of working traps. The sex ratio of the species was determined. Males were recognized by the presence of elongate pleopods on the ventral surface of the pleon. Individuals with marsupia were regarded as gravid females irrespective of whether the marsupium was full or empty. The habitat preference was tested by multivariable statistics (TÓTHMÉRÉSZ 1996). Results and discussion (1) The 10 traps caught 5 species: Porcellium collicola Verh., Trachelipus ratzeburgi Brandt, T. rathkei Brandt and Armadillidium vulgare Latr., Hyloniscus riparius Koch (Table 1). Between 1996 and 1998 among others 8 wetland forests and 3 inundation ruderal vegetation were studied (FARKAS 1999). In all of these two kinds of habitats only these 5 species were collected so this result was to be expected. In other habitats the number of species were between 1 and 11. Table 1. Number of captured male, gravid and non-gravid female individuals Porcellium collicola Trachelipus ratzeburgi Trachelipus rathkei Armadillidium vulgare males ngravid gravid males ngravid gravid males ngravid gravid males ngravid gravid 06. 07. 27 76 26 461 666 554 243 198 143 695 1065 258 06. 21. 23 37 74 207 162 80 86 66 127 136 220 154 07. 06. 67 25 227 270 285 653 121 69 247 162 574 225 07.31. 30 24 425 381 176 878 217 77 302 164 651 180 08. 19. 10 30 190 234 458 202 166 222 83 84 342 77 09. 10. 71 212 212 434 880 591 157 430 98 96 398 72 09. 27. 43 119 81 83 170 83 39 139 19 15 40 0 10. 25. 20 182 0 412 642 61 306 370 0 8 23 0 11. 15. 2 40 0 90 151 5 39 128 0 0 2 0
