Bauer Norbert (szerk.): A Bakonyi Természettudományi Múzeum Közleményei 15. (Zirc, 1996)

SZINETÁR CSABA - MILTÉNYI ATTILA: Adatok a Ság-hegy pókfaunájának ismeretéhez

Summary Investigation of the spider fauna of Ság Mountain - The Ság Mountain is the best known member of the Kisalföld's basalt monadnocks. The characteristic double-cone shape of this Pliocene-age monadnock in the consequence of the twentieth century mining activity. Following the intensive mining for over fifty years (1907-1957) the man has left the area alone. The nature conservation area founded in 1975 is important first of all for its geological value. The surfaces covered with karstic bushy forest and slope steppes vegetation decreased to a fraction of the original; in the same time on the abandoned mine strips in the mountain new and large habitats have formed out for the former rocky vegetation. As a consequence of this, various secondary slump scrap slopes have formed out. The nature could reconquer these areas relatively undisturbed during the past four decades. The interior of the crater can be characterised by the high degree of microclimatic mosaicism with compelling rocky grass fragments and scree vegetation. The exploration of the monadnock that has formerly been completely unexplored sought answers for the following questions. In which extent the bushy woods fragments' soil fauna is preserving the species typical to the bushy woods? The study material was collected with Barber pitfall-trapping. On six different habitats of the mountain, a total of 19 traps were placed. These traps were operated from 8th Apryl 1998 to 20th June. The location of the collection places can be seen on the map draft 1. The „A-D" biotopes are the scree slopes of the artificial crater, the „E" biotope is the bushy woods of the western side and the „F" is the oak-wood (Quercus pubescens) association of the northern side. Besides the soil trapping, hand collections were also carried out. This, first of all, were performed with turning over the scree slope stones (biotopes „A-D") as well as collection from bark (biotope „F"). During the 1998-99 spider faunistic study of Ság Mountain, 50 spider species have been collected. The detailed collection data are contained in Table 1. 40 species were represented in the soil trapping collection. During the hand collections 14 species had mature specimens. Among these latter 10 species haven't occurred in the soil trapping collection. According to the collections' results it can be seen that the karstic bushy woods and the oak wood has the largest specimen and species number. Among the scree slopes of the crater, the biotope „A" of southern exposure proved to be the richest in species. The Table 2 includes the most frequent species, their relative frequency values and occurrence places. The order of the biotopes is according to the collection values. In the Table 3 those species are indicated that were present in the former studies of the Somló bushy woods (LOKSA 1966, SZINETÁR 1991). The typical terricolous spiders e.g. Alopecosa sulzeri, A. trabalis , Gnaphosa modestior are present in the bushy woods spot on the western side of the mountain. On the scree slopes of the artificial crater species tolerating disturbance, such as Pardosa hortensis, are typical.. Some rare species were also found (Zelotes aurantiacus, Zodarion rubidum). A szerzők címe (Authors' adress): SZINETÁR Csaba és MILTÉNYI Attila Berzsenyi Dániel Főiskola Állattani Tanszék H-9700 Szombathely, Károlyi Gáspár tér 4. e-mail: szcsaba@fs2.bdtf.hu