New data on the ctenophore Beroe ovata, an invader to the Caspian Sea
S. V. Vostokov,
A. S. Vostokova,
E. N. Lobachev,
Rahnama Haratbar Reza,
Abtahi Behrooz,
O. M. Tumalaeva,
N. I. Rabazanov https://doi.org/10.18470/1992-1098-2021-4-18-26
Abstract
Aim. Analysis of new data on populations of invasive ctenopfores Вeroe ovata and Mnemiopsis leidyi in the Caspian Sea and assessment of adaptation of B. ovata to new habitat conditions.
Material and methods. The data was obtained in the Dagestan sector of the Middle Caspian Sea in September‐November 2021. Ctenophores and zooplankton were collected by a big cone plankton net (BC) with a 0.5 m2 opening and a Juday plankton net (0.1 m2 opening). Small ctenophores, eggs and zooplankton content were determined in samples fixed with formaldehyde to a final concentration of 4%.
Results. In September‐October 2021, the Вeroe ovata were detected in the shelf waters of Dagestan. The total number of ctenophores reached 32 ind/m2, biomass – 10 g/m2. Individuals up to 35 mm in size were recorded. The abundance of M. leidyi in areas where B. ovata was found 3‐10 times less often than in areas where it was absent. The habitat of Вeroe ovata was limited to the southern part of the Dagestan shelf and a salinity range of 7.1‐5.5 psu.
Conclusion. In 2021, new data was obtained on the Вeroe ovata in the Caspian Sea. The detection of B. ovata in the Caspian Sea in 2021 indicates that the ctenophore overcame winter conditions of the Caspian Sea. The fact determines the further evolution of the Caspian Sea ecosystem. The parameters of the impact of the new alien on the population of M. leidyi were recorded. An analysis of B. ovata distribution in the waters of the Dagestan shelf depending on environmental conditions was carried out.
Supporting agencies: This work was funded by RFBR according to the research project No 20‐54‐56053, INSF, project number No99003103 and State Assignment, project No 0128‐2021‐0004.
About the Authors
S. V. Vostokov
P.P. Shirshov Institute of Oceanology Russian Academy of Sciences (IO RAS)
Russian Federation
Russian Federation
Sergey V. Vostokov, Senior Scientist, Department of Biology
36 Nakhimovsky Prospekt, Moscow, 117997
Tel. +79096236875
A. S. Vostokova
P.P. Shirshov Institute of Oceanology Russian Academy of Sciences (IO RAS)
Russian Federation
Russian Federation
Anastasia S. Vostokova
Moscow
E. N. Lobachev
Precaspian Institute of Biological Research, Dagestan Federal Research Centre, Russian Academy of Sciences; Laboratory for Comprehensive Research of Natural Resources of the West Caspian Region Dagestan Federal Research Centre, Russian Academy of Sciences
Russian Federation
Russian Federation
Evgeny N. Lobachev
Makhachkala
Rahnama Haratbar Reza
Iranian National Institute for Oceanography and Atmospheric Science (INIOAS)
Islamic Republic of Iran
Islamic Republic of Iran
Rahnama Haratbar Reza
Tehran
Abtahi Behrooz
Shahid Beheshti University, Faculty of Life Sciences and Biotechnology
Islamic Republic of Iran
Islamic Republic of Iran
Abtahi Behrooz
Tehran
O. M. Tumalaeva
Pyatigorsk Medical and Pharmaceutical Institute, Branch of Volgograd State Medical University
Russian Federation
Russian Federation
Oksana M. Tumalaeva
Pyatigorsk
N. I. Rabazanov
Precaspian Institute of Biological Research, Dagestan Federal Research Centre, Russian Academy of Sciences; Dagestan State University
Russian Federation
Russian Federation
Nuhkadi I. Rabazanov
Makhachkala
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Review
For citations:
Vostokov S.V., Vostokova A.S., Lobachev E.N., Reza R., Behrooz A., Tumalaeva O.M., Rabazanov N.I. New data on the ctenophore Beroe ovata, an invader to the Caspian Sea. South of Russia: ecology, development. 2021;16(4):18‐26. (In Russ.) https://doi.org/10.18470/1992-1098-2021-4-18-26
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