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International Journal on Algae
SJR: 0.219 SNIP: 0.261 CiteScore™: 0.24

ISSN Druckformat: 1521-9429
ISSN Online: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v20.i4.50
pages 387-392

The State of Benthic Diatom Communities in Listvennichnyi Bay of Lake Baikal (Russia)

G. V. Pomazkina
Limnological Institute, Siberian Department of the Russian Academy of Sciences, 3, Ulan-Batorskaya St., 664033 Irkutsk, Russia
E. V. Rodionova
Limnological Institute, Siberian Department of the Russian Academy of Sciences, 3, Ulan-Batorskaya St., 664033 Irkutsk, Russia
I. V. Khanaev
Limnological Institute, Siberian Branch of RAS, 3 Ulan-Batorskaya St., Irkutsk 664033, Russia
T. A. Scherbakova
Limnological Institute, Siberian Branch of RAS, 3 Ulan-Batorskaya St., Irkutsk 664033, Russia

ABSTRAKT

The coastal algocenosis of the Listvennichnyi Bay of Baikal since 2011 has been undergoing changes because of excess anthropogenic level. We studied species composition and abundance of the bay littoral diatom community in the spring and summer of 2016-2017 along a section located at a depth of 2-8 m. In the studied period, Fragilaria capucina (Kutz.) J.B. Petersen dominated the studied area. The abundant development of this taxon (yielding than 50% of the total number of microalgae) and associated species of diatoms in the spring decreased the number of microphytobenthos to extremely high, previously unrecorded values. Inhibition of the development of littoral endemic species was noted; however, the endemic Hannaea baicalensis Genkal, Popovskaya et Kulikovskiy dominated at depth of 2 m with numbers comparable with F. capucina. It happened firstly at the beginning of ecological degradation of the coastal zone in 2011, when the development of this and other Baikal endemics fell to solitary cells. The subdominant complex of benthic diatoms included frequently occurring, mainly mesosaprobic species. Changes in the dominant complex of diatom communities together with the high abundance of microphytobenthos indicate a steady trend of increasing water trophic level and the further development of eutrophication in the Listvennichnyi Bay.


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