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I Międzynarodowa Konferencja Młodych Naukowców „Przyroda-Las-Technologia" - Abstrakty

Ecology of epiphytic and epigeic linyphiids (Araneae: Linyphiidae) of oak-hornbeam

forest

Zofia Król

Wrocław University of Environmental and Life Sciences The Faculty of Biology and Animal Science [e-mail]

The Linyphiidae is one of the most speciose families within the order of Araneae. There have been 307 species of linyphiids recorded from Poland. Almost half of them have been recorded from few localities and have been considered as rare or rather rare, despite their morę freąuent occurrence in Europę. The majority of uncommon spider species are associated with humid habitats and it is possible, that their status may result from the insufficiency of data.

In the course of present studies, the linyphiid spiders of oak-hornbeam forest in Bystrzyca Valley (Lower Silesia, Poland) were investigated. Spiders were collected during the growing season, with entomological sweep-net and pitfall traps. Quantitative data were used to calculate biocenotic indicators. Dynamics of abundance for selected species was analyzed based on the collected materiał. A total of 28 species of 23 genera have been recorded from the study area. The representatives of Bathyphantes nigrinus, Gonatium rubellum and Centromerus sylvaticus have occurred both in the epiphyton and epigeon. The new localities for two species rare in Europę, two - relatively rare, and for one species relatively rare in Poland, were stated. The epiphyton has been dominated by eurytopic and hygro-hylophilous species, both displaying the wide distribution rangę and considered as common, whereas in the litter layer the spider species which prefer damp woodlands and are considered as widely distributed and freąuent, have dominated.

The records on some species hitherto regarded as rare can allow to change their status to common. Larger amount of stenobiont species in the epigeon indicates that spiders of litter layer constitute the better source for monitoring the habitat conditions. Present studies have not covered all ecological niches of forest, thus further research in that direction should be carried out in futurę.