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Lobelian lakes are clean, oligotrophic, usually non-flow-through lakes, characterized by a small size and the presence of specific flora (Lobelia dortmanna, Isoëtes lacustris, litorella uniflora, Myriophyllum alterniflorum). This type of lakes has been very rarely studied with regard to water mite fauna living in them. The aim of the present study was to partially fill the considerable existing gap in data by studying the distribution of water mites (Hydrachnidia) in the basin of a lobelian lake (Kąpka Lake) situated in Western Pomerania. The research was conducted during the period from May to August 2011, at monthly intervals. The samples were collected from the depths: 0.1 – 5–6 m. in total, 3271 specimens representing 53 water mite species were collected from the whole Kąpka Lake. The most abundant species included the following (in decreasing order): Limnesia maculata, Hygrobates longipalpis, Lebertia porosa, Forrelia liliacea, Mideopsis orbicularis, Limnesia connata, and Limnochares aquatica. the phenology of the species and their abundance in the Kąpka Lake were characterized by one peak of abundance in the month of July. At every depth of the Kąpka Lake, Limnesia maculata was a dominant species.
Small water bodies are very diversified environmentally, and also characterized by a considerable variation range of environmental parameters. these two features are responsible for the fact that the fauna of water mites is characterized by a considerable species diversity and that eurytopic species are prevalent. Due to the eurytopic character of the species it is very difficult to define the rules governing their environmental distribution, which probably often has a local character. The present study is an attempt at analyzing this problem, focusing on water mite fauna of kettle holes in Rostock surroundings (Germany). The main factor diversifying the fauna of studied reservoirs is their trophism. Correspondence analysis distinguished three separate groups among the reservoirs. the isolation of the reservoirs was an important factor diversifying the water mite fauna.
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