Aphids are small sap-sucking insects and members of the superfamily Aphidoideae. Diversity of the aphid fauna in Baikal region has been insufficiently studied. By reason, that among aphids prevail species with narrow specialization in nutrition, namely monophages (feeding on one plant species) and oligophages (feeding on few plant species), distribution of aphids strongly is correlated with distribution of host-plants. This peculiarity allows to use information on distribution ranges of host-plants in study of diversity and distribution of specialized aphids. In 2015–2016, during the research of Aphidoidea diversity in the south of Baikal region, we found new East Asian species of aphids for the region. Two species Eriosoma eligulatum and Sinochaitophorus maoi we have found on trees of Ulmus pumila in Tarbagataiskii district of Republic of Buryatia. Two other species we also found in Buryatia, i.e. Aphis diluta in Dzhidinskii district at plants of Potentilla paradoxa, and Aphis veronicicola in Pribaikalskii district at plants of Veronicastrum sibiricum. All these four aphids species we have collected at the same plant species, which are their host plants in the Russian Far East and in countries of Eastern Asia. This fact suggests that findings of these aphids seem to be logical and are explained only by insufficient knowledge of these insects in Baikal region. Additional investigations will allow revealing new localities of the aphids. The fifth species Aphis saussurearadicis we collected in the vicinity of Irkutsk city on plants of Saussurea parviflora. Apparently, the finding of this aphid species in the region is a result of recent introduction. Due to the lack of the East Asian host plants (Saussurea odontolepis, S. pulchella) in Baikal region A. saussurearadicis showed the change of trophic preferences. The possibility of such a change is predetermined by the fact that S. odontolepis and S. pulchella are not closely related species and belong to different subgenera of Saussurea. We suggest that in the area of big cities like Irkutsk, it’s logical to expect new introduced species of aphids following the introduction of adventive host plants to the region.

Dementyeva Maria Konstantinovna, Leading Engineer, Irkutsk State University, 1, K. Marx st., Irkutsk, 664003, Russian Federation, e-mail: marycatde@mail.ru 

Chepinoga Victor Vladimirovich, Doctor of Sciences (Biology), Leading Research Scientist, V. B. Sochava Institute of Geography SB RAS, 1, Ulan-Batorskaya st., Irkutsk, 664033, Russian Federation, Professor, Irkutsk State University, 1, Karl Marx st., Irkutsk, 664003, Russian Federation, e-mail: victor.chepinoga@gmail.com

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