Beetles (Coleoptera) in Stagnant Water Bodies of the Middle Part of the Gydan Peninsula

Abstract

The fauna of water beetles of the main types of stagnant water bodies in the middle part of the Gydan Peninsula was studied. Altogether, 20 species were found, with 2 to 16 species recorded in diff erent types of water bodies. The family Dytiscidae was represented by the greatest number of species; the most diverse genera were Agabus and Hydroporus, which together accounted for 60% of the total species richness. Most of the recorded species have vast ranges extending both longitudinally and latitudinally. The East Palaearctic species Helophorus niger was recorded within the “penetration area” at its western distribution boundary. The most common species in the material studied were Agabus serricornis and A. arcticus. Beetles were the most abundant in floodplain lakes and temporary water bodies. The highest faunal similarity was recorded between temporary water bodies and swamps.