A preliminary survey of soil nematodes (Nematoda) in inverse gorges in the Ceske Svycarsko National Park (Czech Republic)

摘要

Soil nematodes were studied in three gorges (Hauschengrund, Brtnicky potok and Kachni potok) in the Ceske Svycarsko National Park. Soil samples were taken from the bottom, the middle and the uppermost parts of the sides of the gorges on 24-25 June 2008. In total 161 species were identified of which Cylindrotheristus pannonicus (Andrassy, 1985), Chiloplectus cancellatus (Zullini, 1978), Malenchus gratiosus Andrassy, 1981, Prismatolaimus stenolaimoides Loof, 1971, Eudorylaimus familiaris Winiszewska-Slipinska, 1987 and Tantunema intermedium (Pena Santiago et Coomans, 1996) are new to the fauna of the Czech Republic. The total mean abundance of nematodes in the gorges ranged from 0.70 to 7.72× 10~6 ind.m~(-2), most of which belonged to the order Tylenchida. The greatest species and generic variety was at the bottoms of the gorges, where bigger nematodes were abundant. High up the sides of the gorges small species prevailed mainly fungivores of the genera Filenchus and Aphelenchoides, and bacterivorous Wilsonema schuurmansstekhoveni (De Coninck, 1931) and Acrobeloides nanus (de Man, 1880). Plant parasitic and predacious nematodes occurred at relatively low population densities and mainly at the bottoms of the gorges. The dendrograms produced by the cluster analysis of the species and genera showed that the fauna of nematodes at the bottoms of the gorges differed from that on the sides of the gorges and the bottom of each of the three gorges had a somewhat different fauna. The nematode fauna of the sides of the gorges consisted of a mosaic of local assemblages rather than clearly demarcated sets of zones.