Current state of zooplankton in the Kondopoga Bay of Onego Lake
The transformation of the ecosystem in the Kondopoga Bay of Onego Lake occurred as a result of the long-term anthropogenic influence of the pulp and paper mill wastewater discharge. Wastewater enters the upper part of the bay and then, with distance, it dilutes, so its effect on plankton decreases in the central and open parts of the bay. The monitoring using zooplankton indicators makes possible to assess the current state of the pelagic system in the bay, its spatial and temporal distribution, and its response to the decrease of anthropogenic pressure. The current state of zooplankton in different parts of the bay has been assessed. Zooplankton was sampled in August of 2017, using plankton nets; the sampling was conducted at five stations, unequally distanced from the location of wastewater discharge. The species composition of the zooplankton community was stable and has not changed since the 1960s. The regularities in zooplankton spatial distribution, associated with anthropogenic eutrophication, have persisted. The zooplankton abundance was the highest in the upper part of the bay (50,000 ind./m3 and 1.5 g/m3) and, as expected, gradually decreased along the bay down to its open part (4,500 ind./m3 and 0.12 g/m3). A criterion for the anthropogenic load intensity is proposed; as such, the ratio of quantitative zooplankton characteristics from the upper and central parts of the bay can be used. In the recent decades, the decrease in the volume of wastewater has led to stabilization of the pelagic zooplankton state in the Kondopoga Bay.
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
2019
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| Subjects: | Anthropogenic effects, Freshwater ecology, Geographical distribution, Wastewater discharge, Plankton surveys, Aquatic communities, Pelagic zooplankton, Eutrophication, Географическое распределение, Пелагический зоопланктон, Антропогенное влияние, Экологический мониторинг, Эвтрофикация, |
| Online Access: | http://hdl.handle.net/1834/15631 |
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