Abstract
The scallop Argopecten purpuratus is a heavily exploited resource along the coasts of Peru and north-central Chile, especially after El Niño events, when the species undergoes high increases in abundance. Little is known about its genetic structure or demographic history, two important factors to ensure sustainable exploitation. We sequenced the cytochrome oxidase I and cytochrome b genes of 116 individuals from six localities (between 05°44′S 80°53′W and 23°31′S 70°33′W). We found high levels of genetic diversity in the analyzed populations. No geographical structuring was observed in the haplotype network, which consisted of a few central, widely distributed haplotypes, and many derived population-specific haplotypes separated by few mutations. This pattern suggests a recent population expansion and moderate to low current gene flow among populations. Mismatch analysis, neutrality tests, and a Bayesian skyline analysis confirmed the occurrence of a past event of population expansion approximately 5,000 years ago, which coincides with increasingly stronger and more frequent El Niño events.
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Acknowledgements
We are very grateful to the teams of the Unidad de Investigaciones de Invertebrados Marinos, Instituto del Mar (IMARPE) of Peru and of the Instituto de Investigaciones Oceánicas (Universidad de Antofagasta) of Chile for their assistance in field work. Financial and logistic support for field work was provided by the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (Germany) in the frame of a co-operation project. Financial support for laboratory work was provided by grants of the Secretary of Science and Technique, National University of Córdoba. This work was carried out in the context of the PhD thesis of M.S. Acosta-Jofré at the National University of Córdoba, Argentina.
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Acosta-Jofré, M.S., Sahade, R., Mendo, J. et al. Population genetic structure and demographic history of the scallop Argopecten purpuratus from Peru and Northern Chile: implications for management and conservation of natural beds. Hydrobiologia 847, 11–26 (2020). https://doi.org/10.1007/s10750-019-04048-5
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DOI: https://doi.org/10.1007/s10750-019-04048-5