Epigean communities of harvestmen (Opiliones) in Pannonian Basin floodplain forests: an interaction with environmental parameters

During the years 2015–2016, we studied the fauna of epigeon in eight similar habitats in Slovakia and Serbia. The study material of Opiliones was obtained by a pitfall trap method. We focused on the comparison of the incidence of harvestmen in floodplain forests and ecotones alongside the Danube River in Slovakia and along the Tisa and Begej River in Serbia. We examined their dependence on anthropogenic impact (frequency of visits), cover of vegetation layers (herbs, shrubs and trees), plant diversity of vegetation layers, area of forest stands, distance to the forest edge, circumference of forest stands, age of forest stands, thickness of litter layer and physico-chemical properties of soil and litter (pH, conductivity, P, N, C, H). Total epigeic activity of harvestman showed significant positive relationship with proportion of N in litter. Community equitability was positively related with species richness of plant communities in shrub layer and negatively related with H content of soil. We did not find any significant correlations between diversity of harvestman communities and measured environmental characteristics.