Kalinkina N., Sidorova A., Polyakova T., Belkina N., Berezina N., Litvinova I. Decline in the deepwater benthic communities abundance in the Onego Lake under multifactor influence // Principy èkologii. 2016. № 2. P. 43‒61. DOI: 10.15393/j1.art.2016.5182


Issue № 2

Original research

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Decline in the deepwater benthic communities abundance in the Onego Lake under multifactor influence

Kalinkina
   Nataliya Michailovna
Dr.Sci., Northern Water Problems Institute, KRC RAS, cerioda@mail.ru
Sidorova
   Anastasiya Ivanovna
PhD, Northern Water Problems Institute, KRC RAS, cerioda@mail.ru
Polyakova
   Tamara Nikolaevna
-, Northern Water Problems Institute, KRC RAS, cerioda@mail.ru
Belkina
   Nataliya Alexandrovna
PhD, Northern Water Problems Institute, KRC RAS, cerioda@mail.ru
Berezina
   Nadezda Alexandrovna
PhD, Zoological Institute RAS, cerioda@mail.ru
Litvinova
   Irina Abramovna
-, Northern Water Problems Institute, KRC RAS, cerioda@mail.ru
Keywords:
Onego Lake
deepwater benthic communities
bottom sediments
transformations
anthropogenic load
bioinvasion
Summary: The dynamics of deepwater benthic communities state between 1988 and 2015 was analyzed. In the last decade the decline in the deepwater benthic communities development indicators is observed in Petrozavodskaya Bay and contiguous central area of the Lake Onego. The abundance of benthos decreased by 6-7 times, biomass dropped in 2-4 times. At the same time the changes in sedimentation processes of organic matter, nutrients, iron and manganese are observed in the water ecosystem. This has resulted in an increase in the concentrations of Fe and Mn in the sediment surface layers; in pore waters up to 13 mg Fe/l and 7 mg Mn/l. The sharp increase in the content of iron and manganese in the bottom sediment can be considered as a possible factor of benthos oppression. Another reason of the benthos decrease is the reduction of anthropogenic load. Now Petrozavodskaya bay receives 3 times less light organic substances than 10 years ago. The third possible reason for the reduction of benthic communities is invasion of baikalian amphipods Gmelinoides fasciatus, resulting in the redistribution of organic matter flow from the littoral zone to the pelagic zone and depletion of deepwater benthic food resources.

© Petrozavodsk State University

Reviewer: A. K
Reviewer: A. E. Veselov
Received on: 12 April 2016
Published on: 20 June 2016

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