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«IZVESTIYA IRKUTSKOGO GOSUDARSTVENNOGO UNIVERSITETA». SERIYA «BIOLOGIYA. ECOLOGIYA»
«THE BULLETIN OF IRKUTSK STATE UNIVERSITY». SERIES «BIOLOGY. ECOLOGY»
ISSN 2073-3372 (Print)

List of issues > Series «Biology. Ecology». 2025. Vol 54

Structure and Production Characteristics of the Macrozoobenthos of Lake Yakondykon (Amut Depression, Northern Transbaikalia)

Author(s)

A. N. Matveev1, V. P. Samusenok1, A. L. Yuriev1, A. I. Vokin1, E. A. Erbaeva1, G. P. Safronov1, N. A. Rozhkova2, V. P. Semernoy3, T. Ya. Sitnikova2, I. O. Batranina1, E. B. Govorukhina1, K. V. Tarakanova1

1 Irkutsk State University, Irkutsk, Russian Federation

2 Limnological Institute SB RAS, Irkutsk, Russian Federation

3 Yaroslavl State University, Yaroslavl, Russian Federation

Abstract
The report concludes a series of publications on the structure and production characteristics of macrozoobenthos in large lakes of the Amut Depression at the source of the Barguzin River, one of main tributaries of Lake Baikal in East Siberia. The aim of this work was to study the biodiversity and production of the macrozoobenthos in Lake Yakondykon. The lake is located below the upper moraine that dams the Lake Amut basin at an elevation of 1,444 m a. s. l., with a maximum depth of 21 meters. The dominant sediment type in the depth zone from the water's edge to 10 m. is coarse quartz sand covered with detritus. Silty sands predominate in the 10-15 m depth range, while deeper sediments are dominated by dark brown silts. On August 17, 2008, 28 samples were collected in duplicate across all depth zones using a small model of the Petersen sampler. Fifty-one species and forms of benthic invertebrates have been identified in the lake's fauna, belonging to 11 taxonomic groups of family rank or higher. Chironomidae (24 species) are characterized by the greatest species diversity, followed by oligochaeta (10 species), caddisflies (4 species), bivalvia (3 species), and other taxonomic groups, each represented by one or two species. The number of taxonomic groups decreases with increasing depth. The maximum number (11) is observed at a depth of 1 m, with eight groups recorded at depths of 3 and 5 m, and three, five, and one groups in deeper zones, respectively. The highest abundance and biomass of zoobenthos were recorded in the upper littoral zone at a depth of 1 m: the average abundance of organisms here was 5,225 spec./m2, and the biomass was 4.834 g/m2. At a depth of 3 m, these values decreased more than threefold: 1.45 spec./m2 and 1.163 g/m2, respectively. At a depth of 5 m, zoobenthos biomass increased slightly (2.658 g/m2), primarily due to the numerous Gammarus lacustris, while the abundance decreased. At depths of 10 m and below, the abundance and biomass of zoobenthos are low: from 775 spec./m2 at a depth of 15 m to 300 spec./m2 at 20 m and from 0.742 g/m2 at a depth of 15 m to 0.567 g/m2 at a depth of 10 m.The species diversity of macrozoobenthos in Lake Yakondykon is significantly lower (approximately 30%) than in the neighboring, larger and significantly deeper Lake Amut. However, the taxonomic structure of the benthic communities of both lakes at the same depths, as well as many production parameters of their main groups, exhibit remarkable similarities. In both lakes, chironomids are dominant throughout, with bivalves and oligochaetes as subdominants in the littoral, bivalves and lacustrine gammarus in the sublittoral, and oligochaetes in the profundal.
About the Authors

Matveev Arkadiy Nikolaevich, Doctor of Science (Biology), Professor, Head of Chair Irkutsk State University 1, K. Marx st., Irkutsk, 664003, Russian Federation e-mail: matvbaikal@mail.ru 

Samusenok Vitaliy Petrovich, Candidate of Science (Biology), Associate Professor Irkutsk State University 1, K. Marx st., Irkutsk, 664003, Russian Federation e-mail: samusenk@mail.ru 

Yuriev Anatoliy Leonidovich, Candidate of Science (Biology), Associate Professor Irkutsk State University 1, K. Marx st., Irkutsk, 664003, Russian Federation e-mail: yuriev@bk.ru 

Vokin Aleksey Innokentyevich, Candidate of Science (Biology), Associate Professor Irkutsk State University 1, K. Marx st., Irkutsk, 664003, Russian Federation e-mail: vokin@bk.ru 

Erbaeva Engelsina Aleksandrovna, Candidate of Science (Biology) 

Safronov Gennadiy Petrovich, Candidate of Science (Biology)  

Rozhkova Natalya Anatolyevna, Candidate of Science (Biology), Senior Research Scientist Limnological Institute SB RAS 3, Ulan-Batorskaya st., Irkutsk, 664033, Russian Federation e-mail: rozhkova@lin.irk.ru 

Semernoy Viktor Petrovich, Doctor of Science (Biology), Professor Yaroslavl State University 14, Sovietskaya st., Yaroslavl, 150000, Russian Federation e-mail: semernoy@bio.uniyar.ac.ru 

Sitnikova Tatiana Yakovlevna, Doctor of Science (Biology), Leading Research Scientist Limnological Institute SB RAS 3, Ulan-Batorskaya st., Irkutsk, 664033, Russian Federation e-mail: sit@lin.irk.ru 

Batranina Irina Olegovna, Candidate of Science (Biology), Associate Professor Irkutsk State University 1, K. Marx st., Irkutsk, 664003, Russian Federation e-mail: eropova.irina@yandex.ru 

Govorukhina Ekaterina Borisovna, Candidate of Science (Biology), Associate Professor Irkutsk State University 1, K. Marx st., Irkutsk, 664003, Russian Federation e-mail: kgovoruhina@mail.ru 

For citation
Matveev A.N., Samusenok V.P., Yuriev A.L., Vokin A.I., Erbaeva E.A., Safronov G.P., Rozhkova N.A., Semernoy V.P., Sitnikova T.Ya., Batranina I.O., Govorukhina E.B., Tarakanova K.V. Structure and Production Characteristics of the Macrozoobenthos of Lake Yakondykon (Amut Depression, Northern Transbaikalia). The Bulletin of Irkutsk State University. Series Biology. Ecology, 2025, vol. 54, pp. 55-68. https://doi.org/10.26516/2073-3372.2025.54.55 (in Russian)
Keywords
macrozoobenthos, structure, abundance, biomass, Lake Yakondykon, Northern Transbaikalia.
UDC
574.587(571.54/.55)
DOI
https://doi.org/10.26516/2073-3372.2025.54.55
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