Ecological and Morphological Characteristics
of the Posolskaya Population of the Baikal Omul
<em>Coregonus migratorius</em> Georgi in the Current Period (2020)

V. V. Smirnov; N. S. Smirnova-Zalumi; A. I. Blagodetelev; L. V. Sukhanova

List of issues > Series «Biology. Ecology». 2023. Vol 43

Ecological and Morphological Characteristics of the Posolskaya Population of the Baikal Omul Coregonus migratorius Georgi in the Current Period (2020)

Author(s)

V. V. Smirnov, N. S. Smirnova-Zalumi, A. I. Blagodetelev, L. V. Sukhanova

Abstract

The timing of the start and end of the spawning migration of the Baikal omul is specific for each of its populations, is closely related to the temperature regime in their areals and fluctuates from year to year in accordance with the variability of climatic conditions in the basin of the lake. Since the thermal and water regime of Lake Baikal is changing under the influence of global warming, the omul populations are adapting to shifts in the rhythms of the functioning of the lake's ecosystem. The purpose of this work is to analyze changes in the current ecological and morphological composition of spawning stocks of omul on the example of the posolskaya population in connection with the recorded changes in the timing of its migration for spawning in the 2000s. To analyze the nature of the variability in the timing and dynamics of spawning migration in 2009–2019, we used data from calendar records of the catch by a fixed river seine of mature individuals entering spawning rivers – tributaries of Posolsky Sor Bay. For ecological and morphological analysis, we used data on the morphometry of the omul that entered the Bolshaya Rechka River (one of the main tributaries of the Posolsky Sor. Bay) in different periods of the spawning season of 2020. The results of measurements of spawning migrants in 2020 indicate that, against the background of a general delay in the timing of migration, the dynamics of the morpho-ecological composition of spawning shoals is identical to that in the 1960s and 1980s and is typical for the population under the study. At the same time, data on the morphometry of fish that entered the river in different periods of the spawning season of 2020 indicates a change in the ecological and morphological structure of the population, namely, the quantitative ratio of spawning migrants from various subpopulations changes towards the predominance of "pelagic predators" – inhabitants of the deep-sea areas of Lake Baikal.

About the Authors

Smirnov Vasiliy Vasilievich, Doctor of Sciences (Biology), Principal Research Scientist, Baikal Museum SB RAS, 1, Academicheskaya st., Listvyanka Settl., 664520, Russian Federation, e-mail: bmsmirnov@mail.ru

Smirnova Natalia Sergeevna, Candidate of Sciences (Biology), Senior Research Scientist, Limnological Institute SB RAS, 3, Ulan-Batorskaya st., Irkutsk, 664033, Russian Federation, e-mail: lsukhanova@lin.irk.ru

Blagodetelev Andrey Ivanovich, Сhief Fish Breeder, Bolsherechensky Fish Hatchery of FSFI Glavrybvod, 139A, Vagzhanova st., Bolshaya Rechka settl., Republic of Buryatia, 671208, Russian Federation, e-mail: omulll@yandex.ru

Lyubov Vasilievna Sukhanova, Candidate of Sciences (Biology), Senior Research Scientist, Assistant Professor, Limnological Institute SB RAS, 3, Ulan-Batorskaya st., Irkutsk, 664033, Russian Federation, E-mail: lsukhanova@lin.irk.ru

For citation

Smirnov V.V., Smirnova-Zalumi N.S., Blagodetelev A.I., Sukhanova L.V. Ecological and Morphological Characteristics of the Posolskaya Population of the Baikal Omul Coregonus migratorius Georgi in the Current Period (2020). The Bulletin of Irkutsk State University. Series Biology. Ecology, 2023, vol. 43, pp. 3-15. https://doi.org/10.26516/2073-3372.2023.43.3 (in Russian)

Keywords

Lake Baikal, omul of the posolskaya population, dynamics of spawning migration, Bolshaya Rechka River, lacustrinal biotopes, subpopulations.

UDC

597.553.2

DOI

https://doi.org/10.26516/2073-3372.2023.43.3

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List of issues > Series «Biology. Ecology». 2023. Vol 43

Ecological and Morphological Characteristics of the Posolskaya Population of the Baikal Omul Coregonus migratorius Georgi in the Current Period (2020)

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