Acta Univ. Agric. Silvic. Mendelianae Brun. 2005, 53, 155-162
Published online 2014-12-28

The communities of harvestmen (Opilionida) of floodplain forest in the Ranšpurk National Nature Reserve and their fluctuations

Hana Šejnohová

Ústav zoologie, rybářství, hydrobiologie a včelařství, Mendelova zemědělská a lesnická univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika

During the years 1993–2001 the monitoring of the soil surface fauna was carried out in a floodplain fo- rest in the Ranšpurk National Nature Reserve (south Moravia). The harvestmen assemblages fluctuation is described in detail in this paper. The method of pitfall traps was used. A total of 3174 individuals of seven harvestmen species were collected. The species composition was very similar to other research results from the southern Moravian floodplain forest. Only the dominance values differ from the values in the other localities. All of the registered species prefer moisture and shadow places. The highest abundance was observed in Astrobunus laevipes (Canestrini, 1872), Nemastoma lugubre (Müller, 1776), Oligolophus tridens (C. L. Koch, 1936) and Rilaena triangularis (Herbst, 1799). The dynamics of harvestmen occurrence during the year had a different development than in other groups of invertebrates. Harvestmen mostly occurred in pitfall traps in autumn and winter months. The highest abundance of harvestmen in traps was observed in December and January. In July 1997, disastrous flood affected all groups of invertebrates. The flood had a minimal impact on the abundance of harvestmen in pitfall traps.


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