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First record of the hydrozoan Podocorynoides minima in the Romanian Black Sea waters

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Abstract

The paper reports the first finding of hydromedusa of Podocorynoides minima (Trinci, 1903) in the plankton samples collected in the summer of 2020 in nearshore, coastal and offshore waters of the Romanian Black Sea shelf. Distribution and abundances of the new incoming species are presented. Different hypotheses on introduction pathways and factors that might ensure or hinder its successful spreading in the Black Sea are discussed. The results point out a climate-driven opportunity and a potential free ecological niche for the species settlement, but also highlight the impediments due to competition pressure. While the polyp stage has not yet been found, this evinces once again the paradigm of this species regarding the cryptic existence of its benthic phase confirmed by the worldwide studies. It also stresses the importance of detection of medusa of the new species even in the absence of the polyp, as a sign of more profound ecological changes that might occur in the Black Sea in the near future.

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Acknowledgements

The study was financially supported by the Romanian Ministry of Research in the framework of the CORE Programme projects: PN 19200302 and PN 19200102.The authors thank all colleagues who helped at samples sorting and made suggestions for manuscript improving.

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  1. The National Institute for Research and Development on Marine Geology and Geo-ecology – GeoEcoMar, 23 – 25 Onciul Street, RO-024053, Bucharest, Romania

    Mihaela Mureşan, Adrian Teacă & Tatiana Begun

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  1. Mihaela Mureşan
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All authors contributed to the study conception and design. The first draft of the manuscript was written by Muresan Mihaela and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Mureşan, M., Teacă, A. & Begun, T. First record of the hydrozoan Podocorynoides minima in the Romanian Black Sea waters. Biologia 77, 1819–1828 (2022). https://doi.org/10.1007/s11756-022-01051-5

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