Free-living nematodes (Nematoda) of the Rokytská Slat' and the Chalupska Slat' peat bogs in the Bohemian Forest (Czech Republic)

摘要

Free-living nematodes were surveyed in the Rokytská Slat' and the Chalupska Slat' peat bogs in the ?umava Mts. in the eastern part of the Bohemian Forest, the Czech Republic. A total of 90 species were identified, 69 of which occurred in the Rokytská Slat' and 66 in the Chalupska Slat'. The majority of these nematodes belonged to the orders Dorylaimida (32%, mostly omnivorous Eudorylaimus), Araeolaimida (25%, mostly bacterivorous Plectus) and Tylenchida (20%, mostly root-fungal feeders Filenchus). Multivariate analyses revealed that the composition of nematode assemblages was more influenced by local conditions in individual patches of peaty soil than by the peat bog as a whole. Nevertheless, a certain effect of the peat bog on the nature of the nematode faunas was detected. Abundant populations of Jensenonchus sphagni indicated top-down control of nematode assemblages in the ombrotrophic Rokytská Slat' peat bog. High values of the ΣMI and MI indices and low values of the PP1/MI ratio generally indicated that the peat bogs studied were in terms of habitats for free-living nematodes undisturbed or only slightly disturbed. Peat bogs thus can play an important role in the preservation of nematode diversity in the Sumava Mts. A significant change in the composition of the nematode assemblages can be used an indicator of the degradation of the peat bogs in the Sumava Mts.