Aquatic and Semiaquatic Heteroptera (Nepomorpha) from the Strei River Basin

During a field campaign in the Strei River basin in August 2014, seven suitable habitats for aquatic and semi-aquatic true bugs were identified from the confluence of the Strei River with the Bărbat River down to the confluence with the Mureș River. Forty-eight individuals belonging to 15 species and nine families of aquatic and semi-aquatic true bugs were sampled. We mention two species considered rare in Romanian fauna: Hebrus montanus and Microvelia pygmaea. The statistic-mathematical analysis showed the similarity of the true bugs’ communities from habitats with similar conditions, as well as the relation of each species with particular habitat conditions, emphasizing the fact that Gerris lacustris is present in the majority of the investigated habitats, while the rest of the species are conditioned mostly by the ratio between the areas with open water and those covered by aquatic vegetation.