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Mollusks of the Aral Sea

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Abstract

Based on published data and studies carried out by the authors over more than 30 years, an analysis of the mollusk fauna of the Aral Sea is made. The species composition of mollusks that lived in the sea during the Holocene is considered and clarified. The main reason for changes in the species composition of this group is shown to have been a decrease or increase in the salinity of the environment associated with changes in the sea level. Long-term changes in the salinity of water, in our opinion, could have become the main reason for the scarcity of the mollusk fauna of the Aral Sea. We assume that the transfer of juvenile mollusks by birds might have played an important role in the replenishment of the fauna with new species. This is probably true for mollusks of the family Cardiidae and Ecrobia grimmi. Another source of replenishment of the fauna of the Aral Sea must have been due to species inhabiting the rivers flowing into the Aral Sea and the surrounding lakes. The process of faunal changes during the last regression of the sea is discussed in detail. The availability of data on the salinity at which the mollusks became extinct makes possible a retrospective evaluation of the estimates of limits of salinity tolerance for the existence of the same species obtained by different methods. The future of the fauna of the mollusks of the Aral Sea is considered in the implementation of different scenarios of sea rehabilitation.

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Notes

  1. The names of taxa indicated by L.S. Berg different from the valid names are shown in square brackets.

  2. The names of taxa indicated by S.A. Sidorov different from the valid names are shown in square brackets.

  3. The names of taxa indicated by V.I. Zhadin different from the valid names are shown in square brackets.

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ACKNOWLEDGMENTS

The authors are grateful to the anonymous reviewer for a detailed review and remarks, as well as to senior researcher of ZIN RAS P.V. Kijashko for advice during the preparation of the manuscript and for provision of images of mollusks.

Funding

This study was supported by the Zoological Institute, Russian Academy of Sciences (ZIN RAS) and was the subject of a State Assignment for 2019–2021, project no. АААА-А19-119020690091-0, “Studies of biological diversity and mechanisms of the impact of anthropogenic and natural factors on the structural and functional organization of ecosystems of continental water bodies: Systematization of the biodiversity of saline lakes and non-saline inland seas in the critical salinity zone and study of the role of brackish water species in ecosystems.”

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  1. Zoological Institute, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    N. V. Aladin, I. S. Plotnikov & A. O. Smurov

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Aladin, N.V., Plotnikov, I.S. & Smurov, A.O. Mollusks of the Aral Sea. Biol Bull Russ Acad Sci 49, 1366–1386 (2022). https://doi.org/10.1134/S1062359022090023

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