| Issue № 2 |
Original research |
pdf-version |
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, Aleksander Nevsky st., 50 185030 Petrozavodsk, Republic of Karelia Russia, cerioda@mail.ru |
| Sidorova Anastasiya Ivanovna | PhD, Northern Water Problems Institute, KRC RAS, Aleksander Nevsky st., 50 185030 Petrozavodsk, Republic of Karelia Russia, cerioda@mail.ru |
| Polyakova Tamara Nikolaevna | -, Northern Water Problems Institute, KRC RAS, Aleksander Nevsky st., 50 185030 Petrozavodsk, Republic of Karelia Russia, cerioda@mail.ru |
| Belkina Nataliya Alexandrovna | PhD, Northern Water Problems Institute, KRC RAS, Aleksander Nevsky st., 50 185030 Petrozavodsk, Republic of Karelia Russia, cerioda@mail.ru |
| Berezina Nadezda Alexandrovna | PhD, Zoological Institute RAS, Sankt-Petersburg, Universitetskaya embankment, cerioda@mail.ru |
| Litvinova Irina Abramovna | -, Northern Water Problems Institute, KRC RAS, Aleksander Nevsky st., 50 185030 Petrozavodsk, Republic of Karelia Russia, cerioda@mail.ru |
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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 |
Received on: 12 April 2016 Published on: 20 June 2016 | |
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