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Invader in disguise for decades: the plumose sea anemone Metridium senile in the Southwestern Atlantic Ocean

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Abstract

The attention towards non-native sea anemone introductions has been steadily increasing as multiple species are reported from new locations each year. However, a lack of monitoring efforts and difficulties associated with the detection and identification of these species may result in overlooking introductions in certain areas. In the southern hemisphere, one of these non-native species is Metridium senile, whose current taxonomic and invasion status in Argentina is unclear. Here, we pooled scientific and community records to shed light on the past, current and future invasion scenario of this species. First, we clarified the taxonomic and invasion status of suspected M. senile populations from Argentina by revising available morphological descriptions and attributes associated with non-native species. Then, we inferred and described the potential dispersal pattern in Argentina from the late 1890s to present day. Finally, we provided a forecast of the species potential distribution range in the Southwestern Atlantic Ocean, along the coast and in off-shore areas. Enough evidence suggests that M. senile is a non-native species that has successfully established in Argentina. This species has been mistakenly considered as native for decades due to taxonomic errors and historical and geographical gaps (i.e., pseudoindigenous species). Its current distribution range in Argentina covers over 2000 km of coastline with a southward expansion in recent years. Moreover, according to our forecasted potential distribution, this species can spread further and reach novel areas in coastal and off-shore locations. As M. senile combines multiple traits of a successful invader, monitoring efforts should be implemented to early detect or prevent its establishment in areas recently colonized or at risk.

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All data generated or analyzed during this study are included in this published article and its Supplementary Information files.

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Acknowledgements

We appreciate the contribution of all the people who kindly provided Metridium senile reports on iNaturalist, especially Gonzalo Bravo (CENPAT, Argentina) and Mariano Rodriguez (Argentina Submarina). We thank Héctor Monsalve, Marcelo Mazza, Juan Ángel Allieri, and Uriel Szokolowicz for providing historical photographs and videos from which invaluable data was retrieved. We also thank Dr. Cristina Damborenea (Museo de La Plata, Argentina) for her kind support in the loan of the holotype specimen of Paraisometridium pehuensis; Dr. Mauricio Zamponi (UNMdP-Argentina, retired) for providing the histological sections of P. pehuensis paratypes; Dr. Sandra Fiori (IADO, Argentina) for kindly providing us information about the status of M. senile in Bahía Blanca; Dr. Evangelina Schwindt (CENPAT, Argentina) for her helpful insights that improved an early version of the manuscript; Julieta Coronel (ESCiMar, Argentina) for her Metridium senile drawing; and two anonymous reviewers whose feedback and suggestions improved the work.

Funding

This work was partially supported by grants from the Agencia Nacional de Promoción de la Investigación, el Desarrollo Tecnológico y la Innovación (PICT 2020–Serie A–01451), and from PADI Foundation (Project No. 68424) to RGM.

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Contributions

All authors contributed to the study conception and design. Taxonomic revision of morphological descriptions was revised and compared by RGM. Type material of Paraisometridium pehuensis was examined by RGM. Historical and current records were compiled and curated by LHG, NB and HG. Species distribution modeling was carried out by NB and LHG. The first draft of the manuscript was written by LHG and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Lucas H. Gimenez.

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Gimenez, L.H., Battini, N., González-Muñoz, R. et al. Invader in disguise for decades: the plumose sea anemone Metridium senile in the Southwestern Atlantic Ocean. Biol Invasions 25, 2159–2173 (2023). https://doi.org/10.1007/s10530-023-03031-5

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  • DOI: https://doi.org/10.1007/s10530-023-03031-5

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