Herpetobiont arachnids of a beech forest (Transcarpathia) (p. )
Abstract
Samples were taken by Barber’s pitfall traps during the field seasons 2011 and 2012 in environs of Vugilka (Tjachevsky district, Transcarpathia, Carpathian Biosphere Reserve). 20 sampling plots were located: 1) under beech forest canopy, 2) in the centre of a glade and 3) in a forest edge. Each plot was contained three pitfall traps. The general exposition of traps has made 15532 trap-days. 14298 individuals of herpetobiont arachnids (including 349 individuals of pseudoscorpions, 3423 individuals of harvestmen and 10526 individuals of spiders) have been collected and defined.66 species of spiders, 10 species of harvestmen and 3 genera of pseudoscorpions were found. Acantholycosa lignaria (Clerck, 1757) and Zelotes erebeus (Thorell, 1871) were registered in Ukraine for the first time. Following families of spiders and harvestmen were characterized by the greatest number of species: Linyphiidae (25 species), Lycosidae (9 species), Gnaphosidae (8 species), Agelenidae (5 species), Nemastomatidae (3 species) and Trogulidae (3 species).The species richness of spider fauna in all biotopes differed slightly: 49 species were registered in the glades, 48 species – in the forest edges and 46 species – under the wood canopy. Differences in taxonomic structure of harvestmen and pseudoscorpions weren’t found.The greatest level of the arachnid dynamic density was noted in the glades – 86,3 individuals/100 trap-days. The arachnid dynamic density showed the consecutive decrease in the forest edge and under the forest canopy – 71,5 and 61,7 individuals/100 trap-days, accordingly. The increases in species richness and dynamic density of spiders in open grassy biotopes in comparison with the sampling plots under the forest canopy were noted. Harvestmen were characterized by the maximum dynamic density in the glades. Pseudoscorpions were more abundant in the shaded forest habitats and in the forest edges. All biotopes weren’t differed on taxonomic structure of harvestmen and pseudoscorpions.References
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