The fauna of aquatic heteropterans (Heteroptera: Nepomorpha and Gerromorpha) was studied in some watercourses flowing into the Barguzin Bay of Lake Baikal (Barguzinsky District, Republic of Buryatia) and in the reservoirs of their basins. 13 reservoirs and watercourses were examined, true bugs were found in 9 of them. To collect insects, a hydrobiological net was used to catch the water column to the bottom. Samples were taken from approximately the same area, which allowed us to compare the results with each other. Among the collections, 12 species of heteropterans from 6 families of the infraorders Nepomorpha and Gerromorpha were identified. Three species of bugs were first noted for the Republic of Buryatia: Cymatia coleoptrata (Fabricius, 1777) for Eastern Siberia was previously indicated in the Irkutsk Region and in Central Yakutia; Hydrometra gracilenta Horvath, 1899 was previously known for the south of the Krasnoyarsk Territory and Central Yakutia, and Microvelia reticulata (Burmeister, 1835) was also mentioned before for the south of the Krasnoyarsk Territory and the Irkutsk Region. The Corixidae family and the genus Sigara were the most highly represented; the species from this taxon also accounted for the largest abundance and occurrence in all water bodies. The occurrence in different types of water bodies was low, which may indicate the specificity of bugs to certain habitat conditions. Species of the genus Sigara, as well as Microvelia reticulata, noted in three out of 9 water bodies, were most prevalent. Aquatic heteropterans were the most diverse and numerous in small floodplain well-heated reservoirs, as well as in the river estuary with a slow course. Higher aquatic vegetation is abundantly developed in these habitats, what is probably the determining condition for the abundance of bugs, since water bugs were few in the river with a slow course, but poorly developed macrophytes and in a large lake without macrophytes; they are represented by a single species for the reservoir. The maximum abundance indicators for heteropterans, greater than these indicators for all other reservoirs, was in the oxbow of Maksimikha River. Among them, the number of Cymatia coleoptrata was 86 % of the total. At the same time, this species was not observed in other water bodies. In the lake Baikal bugs were not found, which confirms the principle of immiscibility of the Baikal and Palearctic faunas. The faunal similarity of the studied reservoirs was low. The floodplain ponds of the Maksimikha River and its outskirts, richly overgrown with macrophytes, were the most similar.

Ivanov Sergei Aleksandrovich, Tyumen State University, 6, Volodarsky st., Tyumen, 625003, Russian Federation, e-mail: amplionus@gmail.com 

Stolbov Vitaly Alekseevich, Candidate of Science (Biology), Associate Professor, Tyumen State University, 6, Volodarsky st., Tyumen, 625003, Russian Federation, e-mail: vitusstgu@mail.ru

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