Abstract
Insight into a species’ native and introduced range is essential in understanding the invasion process. Genetic diversity, propagule pressure and environmental conditions all have been recognised as playing a determinant role in invasion success. Here, we aimed to investigate the genetic diversity and population genetic structure (using the COI mtDNA gene region and 22 nDNA microsatellite markers) of the Asian green mussel Perna viridis within its potential native range in Asia and at introduced locations in the USA and the Caribbean. We also analyse genetic data from vessel intercepts and an incursion. By doing so, we aimed to identify genetic signatures that could allow to track vessel samples to their source and provide further insight into potential high-risk invasive populations or areas. Three top hierarchical clusters were identified using the individual-based Bayesian clustering method in STRUCTURE, corresponding to populations in three world regions: (1) USA and Caribbean, (2) India and (3) Southeast Asia. Within Southeast Asia, additional analysis indicate a shallow genetic differentiation of three subgroups consisting of (3a) Thailand, (3b) Taiwan and Hong-Kong, and (3c) a cluster of Singapore–Indonesia samples. Overall, the population structure found in this study suggests that the markers used could be useful in identifying source populations, particularly between the three mains world regions. Most surprisingly however, this study shows that the genetic diversity of samples collected from vessel intercepts and incursions did not differ significantly from established populations in Southeast Asia. In this region, in addition to the high vessel connectivity and number of P. viridis transported, all sampled populations are likely to pose a comparable risk in terms of genetic diversity. The present work represents the most comprehensive population genetic study of P. viridis, and the first to address the potential genetic introduction risk posed by populations of this species. The information and genetic markers in this study constitute a valuable addition to the tools already used to infer on potential high-risk source populations of P. viridis. They should therefore prove useful for biosecurity surveillance and management actions directed at this species.
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Acknowledgements
The present work was initiated by researchers of the Aquatic Biosecurity team of the Western Australian Government Department of Primary Industries and Regional Development Fisheries Division (Fisheries). The work was fuelled by the collaboration established with Matt Gilg (University of North Florida, USA) and researchers in Indonesia, aiming to further investigate the genetic diversity and source populations of introduced P. viridis in the USA and vessel intercepts and an incursion in east Indonesia. This work involved a collaboration of researchers, government compliance and industry, that facilitated research permits and assistance in their countries and the region. We acknowledge sample collection assistance of the Aquatic Biosecurity research and compliance teams at the Western Australia Government Department of Primary Industries and Regional Development Fisheries Division (Fisheries), John Lewis at ES Link Services, Mr Lim Chin Sing, at the Tropical Marine Science Institute (TMSI) of National University of Singapore, Mr Gary Chang for supply of mussels from Changi, Singapore, Zhou Yalan from National Sun Yat-sen University and Martin Cheng from the Swire Institute of Marine Science at the University of Hong Kong. We thank Andrea Bertram and Seema Fotedar at Fisheries for technical assistance and also Agata Zabolotny at Fisheries for assistance with map production. Serena Teo and Serina Lee acknowledge support of the National Research Foundation for research facilities at the St. John’s Island National Marine Laboratory. The Laboratory is a National Research Infrastructure under the National Research Foundation Singapore. Thank you to two internal reviewers at Fisheries and two anonymous journal reviewers. This work was funded by the Western Australia Government Department of Primary Industries and Regional Development Fisheries Division and Chevron Australia.
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Dias, P.J., Gilg, M.R., Lukehurst, S.S. et al. Genetic diversity of a hitchhiker and prized food source in the Anthropocene: the Asian green mussel Perna viridis (Mollusca, Mytilidae). Biol Invasions 20, 1749–1770 (2018). https://doi.org/10.1007/s10530-018-1659-6
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DOI: https://doi.org/10.1007/s10530-018-1659-6