Zooplankton of the Chogray Reservoir in the present period
This paper provides the information on the quantitative development and species diversity of the zooplankton community in the Chogray Reservoir for 2018, and the data on long-term changes in zooplankton abundance and biomass for two seasons (spring and autumn). The literature data on these issues from the moment of filling the Chogray Reservoir with water and in the subsequent years are presented as well. The analysis of changes in species diversity and quantitative development over the past 40 years is given. Dominant groups of zooplankters and dominant species among them are identified. A comparison of the dynamics of taxonomic and quantitative development of the zooplankton in the Chogray Reservoir has shown that, over the past 40 years (from 1978 to 2018), its species composition has changed qualitatively. The number of species of planktonic organisms has doubled, mainly on account of rotifers and copepods. The plankton species abundance in 2018 is slightly higher than during the period of filling the reservoir with water in 1971 (25 and 20 species, respectively). At the present time, the copepods prevailed in the plankton, accounting for up to 74.7 % of the abundance and 82.0 % of the total biomass. Average values of the abundance of zooplanktonic organisms do not vary significantly between years during the investigated 40-year period, but, on the average, their biomass was 4 times higher in 1977–1978, mainly on account of the development of larger forms of cladocerans and copepods. The average zooplankton biomass in the Chogray Reservoir is 0.3–0.5 g·m-3, which corresponds to the biomass of mesotrophic reservoirs. It is concluded that the natural food resources for fish farming in the Chogray Reservoir have been preserved.
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
2020
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| Subjects: | Zooplankton, Species diversity, Aquatic communities, Abundance, Copepods, Cladocera, Rotifers, Food resources, Biomass, Копеподы, Веслоногие, Ветвистоусые, Биомасса, Численность, Водные сообщества, Зоопланктон, |
| Online Access: | http://hdl.handle.net/1834/17250 |
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