| Abstract [eng] |
Material (dragonfly larvae, exuviae and imagos) for the study were gathered in 2008 - 2009 in closed lakes of Nemunas and Daugava basins watershed, which are located in Gražutė regional park and Smalvas-Smalvykštis landscape reserve. This work aims to evaluate the dragonfly species diversity and distribution characteristics in closed lakes. 31 closed lakes were selected for research, which according to hydrological conditions and shore size were divided into three groups. 35 species of dragonfly were recorded, of which 6 are enrolled in the Red list of Lithuania and 3 to EU Habitats Directive (92/43/EEC) Annex II. According to Nestedness temperature calculator the most durable species complex of dragon-fly among investigated lakes occurred in second group of lakes, only T = 31.75 ° (p = 0.06). Characteristic dragonfly species for all three of groups lakes were differed (W> 51%). The importance of small closed lake as a dragonfly habitat as well confirms the fact that all indicator species (abundant from 15% to 40% of lakes) were different for all groups of lakes(except one Leucorrhinia albifrons which coincided to first and second groups of lakes). Among indicator species there were five species of the Red list of Lithuania. |
