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Information on polymorphism of the spittlebug Philaenus spumarius L. in five protected nature reservations of Altai Mountains (Katunsky State Nature Reserve, Tigireksky State Nature Reserve, Shavlinsky Nature Area, Katon-Karagaysky Natural Park, Saylyugemsky Natural Park) is presented. The total amount of collected P. spumarius was 549. Six colour forms have been registered in this region: typica, populi, flavicollis, leucocephala, leucophthalma, quadrimaculata, and, in addition, one unidentified form. The occurrence rate of different colour forms of the spittlebug was analyzed. The spatial and biotopical distribution of the registered forms was evaluated. The highest occurrence rate of P. spumarius is reported from shadowed, moderately humid habitats with high diversity of host plants, in particular, in forests (63%), ruderal (47%) and wetland (45%) habitats. According to the results of comparative analysis of morph composition in the Altai and the Ural Mountains, it was concluded that such composition is typical for humid and highland regions of Palaearctic. The obtained data fully confirm the trends revealed in the previous research dedicated to polymorphism of P. spumarius: in humid regions morph composition is more meager and dark colour morphs are prevailing.

Polymorphism of Philaenus spumarius Linnaeus, 1758 (Hemiptera: Auchenorrhyncha: Aphrophoridae) in the Altai Mountains