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Makrozoobentos zarostlého a volného bahnitého litorálu kaprových rybníků
KAJGROVÁ, Lenka
The aim of the study was to evaluate the quantitative composition of benthic invertebrates in the littoral zone with emeragent plants and outside the macrophyte beds. For these purposes, two carp ongrowing ponds were selected in the Czech Republic (Blatná region) with traditional carp (Cyprinus carpio) farming and two organic ponds in Austria (Waldviertel). Samplings were performed in monthly intervals (May - September 2018). Samples were taken from the area of open water (pelagial) and from the littoral zone. The evaluation of benthic macroinvertebrates was supplemented by in-situ monitoring of basic parameters of the aquatic environment, granulometric score and rating of organic substances in the bottom sediment of ponds, both in the pelagic and littoral zone. For the sampling of pond macroinvertebrates associated with the root system of the hard emergent vegetation, a core sampler was chosen that penetrates the roots of hard littoral vegetation. After the samples were processed (collection and weighing) in the laboratory, the organisms were divided into three groups - Chironomidae, Oligochaeta and Varia. The results were presented in graphical form. Regarding results of environmental conditions of the studied ponds, they did not differ significantly. According to the analysis of the data, macroinvertebrates density was higher in organic fish farming ponds than in traditional fish farming ponds. In the litoral zone, the average density of benthic invertebrates was higher than in the pelagiac zone. The biomass of aquatic macroinvertebrates on average was also higher in the littoral zone.
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