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In 11 water bodies 1166 specimens of water mites belonging to 58 species were collected. The most numerous species were Tiphys bullatus (Thor) and Arrenurus globator (Müll.). The greatest number of water mites were found in field ponds (51 species, 59.9% of collected imagines). In midforest waters 25 species (33.5% imagines) and in village reservoirs 15 species (6.6% imagines) were recorded. The water mite assemblages were dominated by species of the astatic spring fauna and those characteristic for small water bodies.
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.
The results of a faunistic survey of water mites from five spring areas in Macedonia are presented. Only in three investigated areas were water mites found. 13 species were identi fied, 2 of which ( Lebertia longiseta and Hygrobates setosus ) are reported as new for the Balkan Peninsula, and 1 ( Lebertia porosa ) as a new for Macedonia. The ecological significance of the researches is briefly discussed
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