Abstract
Marine scallops, with extended planktonic larval stages which can potentially disperse over large distances when advected by marine currents, are expected to possess low geographical differentiation. However, the sessile lifestyle as adult tends to form discrete “sea beds” with unique population dynamics and structure. The narrow distribution of Zhikong scallop (Chlamys farreri), its long planktonic larval stage, and the extremely hydrographic complexity in its distribution range provide an interesting case to elucidate the impact of marine currents on geographical differentiation for marine bivalves at a fine geographical scale. In this study, we analyzed genetic variation at nine microsatellite DNA loci in six locations throughout the distribution of Zhikong scallop in the Northern China. Very high genetic diversity was present in all six populations. Two populations sampled from the same marine gyre had no detectable genetic differentiation (F ST = 0.0013); however, the remaining four populations collected from different marine gyres or separated by strong marine currents showed low but significant genetic differentiation (F ST range 0.0184–0.0602). Genetic differentiation was further analyzed using the Monmonier algorithm to identify genetic barriers and using the assignment test conducted by software GeneClass2 to ascertain population membership of individuals. The genetic barriers fitting the orientation of marine gyres/currents were clearly identified, and the individual assignment analysis indicated that 95.6% of specimens were correctly allocated to one of the six populations sampled. The results support the hypothesis that significant population structure is present in Zhikong scallop at a fine geographical scale, and marine currents can be responsible for the genetic differentiation.
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Acknowledgements
We wish to acknowledge numerous researchers who help collect the live scallops and provide the oceanography information. Great thanks to Drs. Jinzhong Fu, Hyuk Je Lee, Elizabeth G. Boulding, and the other members in the discussion group of evolution and ecology biology for commenting on the early versions of this manuscript, Daniel Noble for English language correction, Yan Li for artwork assistance, and anonymous reviewers for extensive and constructive comments. This research was funded by The National High Technology Research and Development Program of China (“863” program, 2006AA10A408), Specialized Research Fund for the Doctoral Program of Higher Education (20060423015), National Key Technology Research and Development Program of China (2006BAD09A09, 2006BAD09A10) and NCET-06-0594.
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Zhan, A., Hu, J., Hu, X. et al. Fine-Scale Population Genetic Structure of Zhikong Scallop (Chlamys farreri): Do Local Marine Currents Drive Geographical Differentiation?. Mar Biotechnol 11, 223–235 (2009). https://doi.org/10.1007/s10126-008-9138-1
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DOI: https://doi.org/10.1007/s10126-008-9138-1