Structural Features of Scales of Baikal Grayling Thymallus baicalensis under Conditions of an Altered Hydrological Regime

The number of circuli between annual scale rings of grayling Thymallus baicalensis Dybowski, 1874 sampled in the Yenisei River in the downstream section of the Krasnoyarsk Hydroelectric Power Station, which does not freeze in winter, have been investigated and compared with populations of grayling f...

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Veröffentlicht in:Inland water biology 2021, Vol.14 (1), p.60-66
Hauptverfasser: Zuev, I. V., Andrushchenko, P. Yu, Chuprov, S. M., Zotina, T. A.
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container_issue 1
container_start_page 60
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creator Zuev, I. V.
Andrushchenko, P. Yu
Chuprov, S. M.
Zotina, T. A.
description The number of circuli between annual scale rings of grayling Thymallus baicalensis Dybowski, 1874 sampled in the Yenisei River in the downstream section of the Krasnoyarsk Hydroelectric Power Station, which does not freeze in winter, have been investigated and compared with populations of grayling from large tributaries of the Yenisei River (Amyl, Kan, Nizhnyaya Tunguska, and Bolshaya Kheta). It has been shown that graylings inhabiting the Yenisei River have a significantly higher (1.5–2.0 times, p < 0.01) number of circuli in the second, third, and fourth annual rings of the scales than in the populations from the tributaries, which corresponds to a higher growth rate of the grayling population in the Yenisei River. An assumption is made about the transition of graylings inhabiting the Yenisei River channel in the lower reaches of the hydroelectric station to a sedentary lifestyle.
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subjects Annual rings
Biodiversity
Biomedical and Life Sciences
Freshwater & Marine Ecology
Freshwater fishes
Geoecology/Natural Processes
Growth rate
Hydroelectric plants
Hydroelectric power
Hydroelectric power stations
Hydrologic regime
Hydrology
Ichthyology
Life Sciences
Life Sciences & Biomedicine
Marine & Freshwater Biology
Populations
Power plants
Rivers
Science & Technology
Thymallus
Thymallus baicalensis
Tributaries
title Structural Features of Scales of Baikal Grayling Thymallus baicalensis under Conditions of an Altered Hydrological Regime
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