There were a few evidences for the intermediate disturbance hypothesis: certain indices reached their highest values at moderate pollution levels rather than at the cleanest or most polluted sites. Pielou (J) did not show any significant correlations. Mesophilic meadows were generally richer. Effects of urbanization on ground-dwelling spiders in forest patches, in Hungary Tibor Magura Roland Horva´th Be´la To´thme´re´sz Received: 26 August 2009/Accepted: 22 December 2009. This means that although broadly described HRI diversity decreased with increasing pollution level, species richness increased with increasing contamination. HRI correlated negatively with pollution level, while D M correlated positively. The zinc concentration in soil was used as the pollution index.The study revealed a significant effect of metal pollution on spider biodiversity as described by HRI for species (p = 0.039), genera (p = 0.0041) and families (p = 0.0147), and by D M for genera (p = 0.0259) and families (p = 0.0028). J Insect Conserv (2014) 18:5767 DOI 10. 33 km from zinc and lead smelter to an uncontaminated area. Spiders were collected along a metal pollution gradient in southern Poland, extending ca. The dominance pattern of the communities was described with four measures: number of dominant species at a site, percentage of dominant species at a site, average dominant species abundance at a site, and the share of the most numerous species (Alopecosa cuneata) at a site. In different ways the indices describe taxa richness and the distribution of individuals among taxa. insulanus was the most differently, depending on species and metals (Maelfait discriminating species between unpolluted and 1996 Marc et al. Biodiversity was defined by three indices: the Hierarchical Richness Index (HRI), Margalef index (D M) and Pielou evenness index (J). Ground-dwelling spiders are potential sentinel indicator species for heavy metal able to accumulate and respond to heavy metals contamination in soil. The objective of the study was to determine whether long-term metal pollution affects communities of epigeal spiders (Aranea), studied at three taxonomic levels: species, genera, and families.
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