Spider biodiversity potential of an ungrazed and a grazed inland salt meadow in the National Park `Neusiedler See-Seewinkel' (Austria): implications for management (Arachnida: Araneae)

Authors: Zulka, K.P.; Milasowszky, N.; Lethmayer, C.

Source: Biodiversity and Conservation, Volume 6, Number 1, 1997 , pp. 75-88(14)

Publisher: Springer

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To assess the biodiversity potential of an ungrazed and a grazed inland salt meadow in the Seewinkel (Eastern Austria), spider assemblages were recorded by pitfall trapping for 1 year. Both species assemblages consisted, to a large extent, of rare species of conservation interest. The species assemblage of the grazed site was dominated by Pardosa agrestis, but highly specific halotopobiontic species also occurred in higher numbers. Halotolerant species were also present in the ungrazed meadow, but their individual number was much lower. The species composition of this site reflects the more balanced microclimatical situation of the high sward. Comparison of the two assemblages with 207 other meadow spider assemblages of Central Europe shows a separated position, especially of the grazed site assemblage. High similarities with assemblages of meadows with a similar vegetation structure indicate a high importance of management. Considering the high proportion of rare species on both sites, the best management of the salt meadow and pan shores of the Seewinkel should combine areas of light grazing with ungrazed areas. However, the proportion of these parts and the intensity of grazing still remains to be determined by quantitative experiments.

Keywords: conservation; grazing; halophily; pasture; similarity index.

Document Type: Regular Paper

Affiliations: Institute of Zoology, University of Vienna, Althanstr. 14, A-1090 Vienna, Austria

Publication date: January 1, 1997

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