Aquatic groups - Macrozoobenthos Sample Clauses

Aquatic groups - Macrozoobenthos. The Danube The macrozoobenthos in the upper part of the Danube old riverbed is assessed at locality No. 4025 - Dobrohošť, approximately in rkm 1839.6. Based on the species composition, it can be stated that rheophilic and oxybiotic species indicating β-mesosaprobity prevail in macrozoobenthos. The dominant species in 2019 were from aquatic molluscs the gravel snail (Lithoglyphus naticoides) and the invasive river nerite (Theodoxus fluviatilis), however, it could be stated that the malacocoenosis of the Danube was relatively rich in species, but the representatives achieved low abundance. Furthermore, the Limnomysis benedeni from crustaceans and representatives of Chironomidae gen. sp. div. and Lumbriculidae gen. sp. div. were abundant, and with low number of representatives the relatively rich in species Amphipoda community was present. The current results in terms of communities of mayflies, caddisflies and dragonflies document only a rare occurrence of representatives. Site No. 3739 is situated in the Danube old riverbed at area of Sap, approximately 1 km upstream of the confluence with the tail-race channel. In this section of the Danube old riverbed, the flow of water is slowed down and in the composition of macrozoobenthos the stagnophilic and oligooxybionic species increase, withstanding milder pollution. Macrozoobenthos samples were generally poor in the assessed year. Relatively rich in species community was formed by crustaceans (Amphipoda), which consisted mainly of Dikerogammarus sp. and Echinogammarus sp.. From among the other groups abundant occurrence achieved representatives of Lumbriculidae and Chironomidae gen. sp. div. and two non-native mollusc species (Theodoxus fluviatilis, Corbicula fluminea). The mayflies communities in the samples of the evaluated year were absent, caddisflies and dragonflies were represented very weakly, mainly by rheophilic species. The site No. 112 is situated by the bridge at Medveďov and macrozoobenthos samples are taken from the left bank of the Danube, approximately in rkm 1806.4. The macrozoobenthos samples taken in the assessed year were poor. From among the aquatic molluscs, mostly the invasive species were recorded: the river nerite (Theodoxus fluviatilis) and the zebra mussel (Dreissena polymorpha) with sparse abundance. In a very large abundance, two species of crustaceans from the amphipods were registered in the macrozoobenthos sample: Dikerogammarus villosus and Echinogammarus ischnus. Mass occurrenc...
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