Vol. 14, No. 6, 2021

Inland Water Biology

Structure and Functioning of Aquatic Ecosystems

Long-Term Changes in the Main Indicators of the Trophic State of the Large Plain Reservoir under the Influence of Climatic Transformation and Successional Processes

E. A. Shashulovskaya, S. A. Mosiyash and I. N. Dalechina p. 627 abstract

Biology, Morphology and Systematics of Hydrobionts

Comparative Morphology of the Genus Hydrocharis L. (Hydrocharitaceae)

A. N. Efremov, V. S. Grishina, C. Toma, A. Mesterházy and E. N. Tchatchouang p. 638 abstract

Morphology and Species Composition of Centrohelid Heliozoans (Centroplasthelida) from the Continental Lowland River with Salinity Gradient

E. A. Gerasimova p. 652 abstract

Landmark Based Morphometric Variations among Indian Major Carps

A. K. Dwivedi p. 662 abstract

Phytoplankton, Phytobenthos, Phytoperiphyton

Phytoplankton As an Indicator of the Modern Ecological State of the Novosibirsk Reservoir

O. P. Bazhenova and V. V. Mikhailov p. 670 abstract

Long-Term Dynamics of Chlorophyll in Plankton of Different Sites in a Large Plain Reservoir

N. M. Mineeva p. 679 abstract

Phytoplankton Diversity and Environmental Drivers in a Backwater Inlet of Central Kerala, Southwest India

P. V. Divya and M. G. Sanilkumar p. 691 abstract

Zooplankton, Zoobenthos, Zooperiphyton

Taxonomic and Community Composition of Zooperiphyton in Forest-Tundra Lakes (Western Siberia)

T. A. Sharapova, A. A. Gerasimova, V. I. Gontar, E. S. Babushkin, V. A. Glazunov, S. A. Nikolaenko and A. G. Gerasimov p. 699 abstract

Estimating the Biodiversity Level of the Pechora River Delta Freshwater Ecosystems by the Structure of Bottom Communities of Cladocera, Copepoda, and Oligoсhaeta

M. A. Baturina and E. B. Fefilova p. 709 abstract

Ichthyology

Current Data on Sakhalin Sturgeon Acipenser mikadoi (Acipenseridae, Acipenseriformes) Biology (Review)

E. V. Mikodina and G. I. Ruban p. 722 abstract

Growth Properties of Endemic Aphanius marassantensis in Hirfanlı Reservoir, Turkey

Semra Benzer p. 732 abstract

Ecological Physiology and Biochemistry of Hydrobionts

Indicators of Cardiac Activity and Oxidative Stress in the Mollusk Anodonta cygnea Under Short-Term Salt Test Load as Biomarkers for Assessing the State of the Organism and the Quality of the Environment

S. V. Kholodkevich, G. M. Chuiko, A. N. Sharov, T. V. Kuznetsova and D. S. Pesnya p. 739 abstract

Content of Methemoglobin in the Blood of Teleost Fish: Effect of Environmental Factors and Natural States of the Organism (Review)

A. A. Soldatov p. 747 abstract

Comparative Aspects of Hypoxia and Hydrogen Sulfide Effects on the Activity of Oxidoreductases in the Gills and Brain of the Sea Ruff Scorpaena porcus

I. V. Golovina and E. E. Kolesnikova p. 758 abstract

Aquatic Toxicology

Effects of Polymetallic Ore Occurrences on Mercury Accumulation by Aquatic Biota in River Ecosystems

M. I. Shapovalov, V. A. Gremyachikh and V. T. Komov p. 766 abstract

Toxicity of Bottom Sediments of the Rybinsk Reservoir According to Long-term Biotesting Data: Report 1. Toxicological Studies

I. I. Tomilina, R. A. Lozhkina and M. V. Gapeeva p. 777 abstract

Brief Communications

Organ Fusion as a Mode of Organ Evolution

M. V. Yastrebov and I. V. Yastrebova p. 788 abstract

Mycoparasite Infection of Daphnia cucullata Sars, 1862 (Crustacea, Cladocera, Daphniidae) in Lake Pleshcheyevo (Yaroslavl Oblast, Russia)

L. V. Voronin and S. M. Zhdanova p. 792 abstract

Minimum Cations Concentrations in Water Required for Maintanance of Ion Balance between the Amur Sleeper Perccottus glenii (Pisces) and the External Environment

V. I. Martemyanov, A. S. Mavrin and L. A. Shuman p. 797 abstract

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