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Hydrobiological Research of the Terek–Caspian Coastal Area

Authors
  • Osmanov, M. M.1
  • Amaeva, F. Sh.1
  • Abdurakhmanova, A. A.1
  • 1 Precaspian Institute of Biological Resources, Dagestan Federal Research Center, Russian Academy of Sciences, Makhachkala, 36700, Russia , Makhachkala (Russia)
Type
Published Article
Journal
Arid Ecosystems
Publisher
Pleiades Publishing
Publication Date
Apr 01, 2021
Volume
11
Issue
2
Pages
207–212
Identifiers
DOI: 10.1134/S2079096121020128
Source
Springer Nature
Keywords
License
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Abstract

AbstractThe structure of zooplankton communities in the Terek–Caspian coastal region of the Caspian Sea under the conditions of flow regulation of the Terek River and its passage through the Uch–Kosinsky channel are studied. Hydrobiological material collected in the waters of the Terek coastal region of the Caspian Sea was used. Long-term data are given for the zooplankton distribution in the studied region, which reflects the nature of the influence of the sea-level regime, the arid climate, the mass development of the Azov–Black Sea invader Acartia tonsa (Dana, 1849), and the trophic pressure of another invasive species, Mnemiopsis leidyi (A. Agassiz), after the passage Terek River runoff in a new channel. The influence of these factors mainly affected the autochthonous fauna of the waters of the Terek coast. It was shown that the previously leading native species, Calanipeda aquae dulcis and Eurytemora grimmi, faded into the background for a long period. It is only in recent years that C. a. dulcis became a subdominant form in the zooplankton of the studied water area of the Caspian Sea due to a decrease in the pressure of the ctenophore Mnemiopsis leidyi.

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