Harvestman assemblages (Arachnida: Opiliones) in Krkonoše National Park

Abstrakt: Harvestmen were collected in 13 localities of Krkonoše National Park from 1988 to 1991 using pitfall traps. Altogether 9106 individuals belonging to ten species were captured. Among them Ischyropsalis hellwigi hellwigi (Panzer, 1794) and Nemastoma triste (C. L. Koch, 1835) are the most interesting finds, rarely reported from the Czech Republic. Canonical correspondence analysis of the harvestman assemblages showed little differentiation between individual assemblages, except for those in the alpine zone, where species richness sharply declined and only Mitopus inorio (Fabricius, 1799) and Platybunus bucephalus (C. L. Koch, 1835) remained abundant. The effect of the herbicide Roundup on the number of opilionid taxa and specimens was non-significant. However, the abundance of Oligolophus tridens (C. Koch, 1836) was higher in the traps located in the treated Rumex alpinus stand.

Klíčová slova: Opiliones, species assemblages, Roundup herbicide treatment, Krkonoše Mountains