The colonization cycle of freshwater insects

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Abstract
This paper summarizes the recent research on problems of the so-called colonization cycle as one aspect of the migration and flight behaviour of freshwater insects. New results are presented and the applied methods described and discussed. In general the research on this phenomenon shows that the colonization cycle can not only be seen as a type of compensatory flight behaviour, but also as an expression of the winter survival strategy of water insects in high mountainous areas. It opens up the possibility of exploiting ecologically different biotopes such as living in coastal streams and oligohaline brackish water estuaries.