Distribution of trophic groups of soil nematodes (Nematoda) and soil food web condition in inverse gorges in the České Švýcarsko National Park (Czech Republic)

0429188 - BC 2015 RIV CZ eng J - Journal Article
Háněl, Ladislav
Distribution of trophic groups of soil nematodes (Nematoda) and soil food web condition in inverse gorges in the České Švýcarsko National Park (Czech Republic).
Acta Societatis Zoologicae Bohemicae. Roč. 77, č. 2 (2013), s. 87-101. ISSN 1211-376X
Grant - others:EEA Financial Mechanism(NO) CZ0048
Institutional research plan: CEZ:AV0Z60660521
Institutional support: RVO:60077344
Keywords : soil zoology * ecology * Nematoda * trophic group * Bohemian Switzerland National Park
Subject RIV: EH - Ecology, Behaviour

Trophic groups of soil nematodes were studied in three gorges (Hauschengrund HG, Brtnický potok BP and Kachní potok KP) in the České Švýcarsko National Park. Soil samples were collected from the bottom, the middle and the uppermost parts (zones) of the sides of the gorges in June and October 2008, 2009 and 2010. Gorges themselves had no significant effect on the total nematode abundance and trophic groups except for plant parasites (low abundance in KP) and omnivores (greater abundance in BP). Sampling date significantly affected the abundance of all trophic groups. Root-fungal feeders fungivores were most abundant on the slopes, predators and insect parasites mostly occurred at the bottoms of the gorges. Cluster analysis indicates that the zonation has a marked effect on the trophic structure of nematode assemblages, although there were many overlaps between-zones associated with seasonal fluctuations in fungivores and root-fungal feeders. Bacterivores, fungivores, root-fungal feeders and omnivores were significantly negatively, and plant parasites and predators significantly positively correlated with soil bulk density. The decrease in soil bulk density generally corresponded with the accumulation of soil organic matter and decrease in soil pH in the upper parts of the gorges. Ratios between nematode trophic groups indicate greater participation of bacteria than fungi in the detritus food web and greater rate of nutrient mineralization via the grazing food web at the bottoms than on the slopes of the gorges. Greater trophic diversity of nematode assemblages at the bottoms of the gorges coincident with greater species and generic richness.
Permanent Link: http://hdl.handle.net/11104/0236125