Preference of Micronectidae (Heteroptera: Corixidae) for low trophism lakes: Data from Mazurian Lake district (Northeastern Poland)

Özet

Türkçe Öz Yok

Abstract

In the lakes of northeastern Poland the occurrence of three Micronecta Kirk, species (Micronecta minutissima, M. griseola and M poweri) was confirmed. Increasing lake trophism and worsening oxygen conditions cause gradual elimination of these species in the following order: M. poweri, M. griseola and M minutissima. Micronecta species occur in around 37% of the lakes in northeastern Poland. In strongly eutrophic lakes, which make up about 40% of these lakes, only M. minutissima was found. Another 40% are lakes with oxygen conditions good enough for M. griseola to occur. The purest lakes contain M. poweri, a species susceptible to oxygen deficiency; these make up only 6% of all lakes in northeastern Poland.