Abstract
Reproductive strategies, whether sexual or asexual, are critical aspects of introduction success and spread for non-indigenous species. The Western Pacific Diadumene lineata (Verrill, 1869), the world’s most widely distributed sea anemone due to numerous introductions, is believed to reproduce only by asexual means outside of its home range. Over the past 100 years, no populations with both males and females have been reported to co-occur outside of its native Japan. We report the first discovery of sympatric reproductive male (sperm-bearing) and female (egg-bearing) D. lineata in Coos Bay, Oregon, USA, confirmed by histological analysis. Given that only single gender introduced populations have been reported elsewhere, the presence of both genders in this US Pacific Northwest bay may be linked to high and continuous propagule pressure resulting from a history of intensive lumber and timber shipping directly between Japan and Coos Bay. Novel modern-day introductions of this species, in which reproductive traits previously only associated with native populations are manifested, could influence the future invasion success and spread of this species.
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Acknowledgements
We thank the Williams College-Mystic Seaport Maritime Studies Program and the Department of Ecology and Evolution at Stony Brook University for financial support. Ali Stevens, Zara Currimjee, Anna Hopkins and Nuria Clodius contributed to field and laboratory work. We thank Nancy Treneman for providing a photograph of anemone populations in Isthmus Slough; Jonathan Geller for information on San Diego anemone populations; Glenn Lopez, Dianna Padilla, and Stephen Baines for comments on the manuscript; and Nuclea Biotechnologies for their help in processing samples.
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Newcomer, K., Flenniken, M.M. & Carlton, J.T. Home and away and home again: discovery of a native reproductive strategy of the globally invading sea anemone Diadumene lineata (Verrill, 1869) in a satellite population. Biol Invasions 21, 1491–1497 (2019). https://doi.org/10.1007/s10530-019-01940-y
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DOI: https://doi.org/10.1007/s10530-019-01940-y