Sergeev M.G. 2019. [The assemblages of Orthoptera in the south-eastern part of West Siberian Plain (the Karasuk River Basin), Russia] // Euroasian Entomological Journal. Vol.18. No.4: 255–264 [in Russian, with English summary].
Institute of Systematics and Ecology of Animals, Siberian Branch, Russian Academy of Sciences, Frunze Str. 11, Novosibirsk 630091 Russia; Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090 Russia. E-mail: email@example.com
ABSTRACT. Orthopteran assemblages are described for the first time for the south-eastern part of West Siberian Plain (Russia) in the Karasuk River Basin. 50 orthopteran species are found. Among them are both some potential pest acridids (Italian and Migratory locusts, Dociostaurus brevicollis (Eversmann), Arcyptera microptera (Fischer de Waldheim), Gomphocerus sibiricus (Linnaeus), Stauroderus scalaris (Fischer de Waldheim), Oedaleus decorus (Germar), Chorthippus albomarginatus (De Geer), s.l. et al. and several relatively rare steppe orthopterans (Miramiola pusilla (Miram), Onconotus laxmanni (Pallas), Aeropedellus baliolus Mistshenko). An analysis of species distribution shows there is the significant faunistic border crossing this basin. On the contrary, an analysis of orthopteran assemblage distribution shows the presence of the wide transition area between the upper (forest-steppe) part of the river basin and its lower (steppe) part. In the natural steppe habitats of plakors and upper terraces, the assemblages of Orthoptera are characterized by the high levels of species diversity and abundance. The assemblages of flood-plains and lower terraces are usually characterized by relatively low levels of species diversity and abundance. Almost all orthopteran assemblages associated with plakors and upper terraces are in one group with common dominance of Euchorthippus pulvinatus (Fischer de Waldheim), Omocestus haemorrhoidalis (Charpentier), Glyptobothrus mollis (Charpentier) and Chorthippus albomarginatus (De Geer), s. str. The second group includes assemblages with very high abundance of the Italian locust (usually during periods of its outbreaks). The last group unites all other assemblages (mainly associated with the local flood-plains and lower terraces). Chorthippus albomarginatus (De Geer), s.l. is the typical dominant in such assemblages.
KEY WORDS: Orthoptera, grasshoppers, Italian locust, West Siberian Plain, biological diversity, assemblage, classification, ordination.