Özet:

Using the example of two mass species of bumblebees in the Middle Ob lowland, it is shown that the change in bumblebees activity during the day is a species-specific indicator. B. distinguendus in the conditions of the Middle Ob lowlands are characterized by the morning-evening rhythm of activity, in B. lucorum, the activity is relatively uniform throughout the day. The optimal temperature for active foraging of both species varies within 19–25°?. The total duration of bumblebees diurnal activity at the beginning of the flight is 11–12 hours. In the period of the mass bumblebees flight, the duration increases to 18–19 hours. Keywords: Bombus; circadian activity; bumblebees; optimal temperature; Middle Ob; Bombus lucorum; B. distinguendus References: Alekseev, V.A. (1982). Izucheniye shmeley v opytnom khozyaystve Yaroslavskogo NII zhivotnovodstva i kormoproizvodstva. Nasekomyye-opyliteli selskokhozyaystvennykh kultur. Novosibirsk, 105–110 (in Russian). Bogacheva, I.A., Shalaumova, E.V. (1990). Diurnal activity of bumble bees in the Polar Urals. Fauna and Ecology of the Urals. An Inter-College Collection of Scientific Papers, Perm (Perm State University), 17-26 (in Russian). Demidova, A.T., Tyumaseva, Z.I., Guskova, E.V. (2018). Food specialization of bumblebees (Hymenoptera: Apidae, Bombus Latreille) of the Sredneobsky lowlands Ukrainian Journal of Ecology, 8(2), 315–319 (in Russian). Demidova, ?.?., Tyumaseva, Z.I. (2008). Species composition and biotope distribution of bumblebees of the KHMO [Khanty-Mansi Autonomous Okrug]. Collection of scientific works of the Faculty of Biology, 5, Surgut State University, 124-130 (in Russian). Demidova, ?.?., Tyumaseva, Z.I. (2011). Faunistic and zoogeographical analysis of bumblebees (Hymenoptera, Apidae, Bombus Latr.) of the Sredneobsky lowlands. The bulletin of Saratov State Agrarian University in honor of N.I. Vavilov, 10, 14-17 (in Russian). Palij V.F. (1970). Metodika izucheniya fauny i fenologii nasekomykh. Voronezh, 189 (in Russian). Panfilov, D.V., Shamurin, V.F., Jurcev, B.A. (1960). O soprjazhennom rasprostranenii shmelej i bobovyh v Arktike. Bjulleten’ Moskovskogo obshhestva ispytatelej prirody. Otdel biologicheskij, 65(3), 53-62 (in Russian). Tyumaseva, Z.I. (1988). Topical issues of insect protection in the Southern Urals. Chelyabinsk, 38–43 (in Russian).  

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