Abstract
In 2021, Acanthocyclops trajani Mirabdullayev et Defaye, 2002, was first recorded in the Vistula Lagoon of the Baltic Sea. This species quickly spread throughout the water area of the Lagoon. In summer, A. trajani reached its maximum development (up to 92 thous. ind./m3, 2.4 g/m3); it was a dominant, forming a particularly high proportion of zooplankton in the most polluted, desalinated, and eutrophicated eastern part of the Vistula Lagoon. As a result of predatory feeding, A. trajani exerted significant pressure on the planktonic communities of the lagoon; its diet in August exceeded the production of nonpredatory zooplankton. The pressure on zooplankton increased even more due to the mass development of Cercopagis pengoi (Ostroumov, 1891), with which the new species entered into competitive relationships. The main reasons for the successful naturalization of A. trajani in the Vistula Lagoon, apparently, include some features of its biology, the structure of the plankton community with the presence of unoccupied trophic niches, the continued eutrophication of this waterbody, decreasing pressure of the invasive mollusk Rangia cuneata (G.B. Sowerby, 1831), and the local climate warming noted in recent decades.
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ACKNOWLEDGMENTS
We would like to thank Yu.V. Pristavko, N.P. Dyushkova, and S.N. Arkhipovsky, employees at the Russian Fe-deral Research Institute of Fisheries and Oceanography, Atlantic Branch, for assistance in sampling.
Funding
These studies were conducted as part of the Russian Federal Research Institute of Fisheries and Oceanography, Atlantic Branch, theme no. 076–00004–23-00; State Task of the Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, no. 121051100109–1: “Systematics, Diversity, Biology, and Ecology of Aquatic and Semiaquatic Invertebrates, Structure of Populations and Communities in Continental Waters” and State Task of the Limnological Institute, Siberian Branch, Russian Academy of Sciences, no 0279–2021–0007 “Comprehensive Studies of the Coastal Zone of Lake Baikal: Long-Term Dynamics of Communities under the Influence of Different Environmental Factors and Biodiversity; Causes and Consequences of Negative Environmental Processes (2019–2024).”
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Abbreviations: Fu, caudal rami (furka); L, length; Me, lateral furcal seta; W, width; Sp, spine; Set, seta; P1–P5, thoracic legs 1–5; P4enp3, the third endopodite segment of the thoracic leg 4; Td, dorsal furcal seta; Te, outer apical furcal seta; Ti, inner apical furcal seta; Tme, outer medial apical furcal seta; and Tmi, inner medial apical furcal seta.
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Semenova, A.S., Mirabdullaev, I.M., Sheveleva, N.G. et al. First Record of Acanthocyclops trajani (Copepoda, Cyclopidae) in the Vistula Lagoon of the Baltic Sea. Inland Water Biol 16, 840–854 (2023). https://doi.org/10.1134/S1995082923050127
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DOI: https://doi.org/10.1134/S1995082923050127