Abstract
Variations in the relative contributions of gene flow and spatial and temporal variation in recruitment are considered the major determinants of population genetic structure in marine organisms. Such variation can be assessed through repeated measures of the genetic structure of a species over time. To test the relative importance of these two phenomena, temporal variation in genetic composition was measured in the limpet Cellana grata, among four annual cohorts over 10 years at four rocky shores in Hong Kong. A total of 408 limpets, comprising individuals from 1998, 1999, 2006 and 2007 cohorts were screened for genetic variation using five microsatellite loci. Minor but significant genetic differentiation was detected among samples from the 1998/1999 collection (F ST = 0.0023), but there was no significant differentiation among the 2006/2007 collection (F ST = 0.0008). Partitioning of genetic variation among shores was also significant in 1998/1999 but not in the 2006/2007 collection, although there was no correlation between genetic and geographic distances. There was no significant difference between collections made in 1998/1999 and 2006/2007. This lack of clear structure implies a high level of gene flow, but differentiation with time may be the result of stochastic recruitment variation among shores. Estimates of effective population size were not high (599, 95% C.L. 352–11397), suggesting the potential susceptibility of the populations to genetic drift, although a significant bottleneck effect was not detected. These findings indicate that genetic structuring between populations of C. grata in space and time may result from spatio-temporal variation in recruitment, but the potential development of biologically significant differentiation is suppressed by a lack of consistency in recruitment variability and high connectivity among shores.
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Acknowledgments
We thank M. N. Chan for microsatellite characterization, R.I. Lewis for his input during the early parts of this study and Neil Hutchinson for analysis of population structure. We are especially grateful to Michael Hellberg for constructive, critical comment on the MS. This research was supported by the Research Grants Council, Hong Kong (Project no. HKU7238/97M).
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Communicated by M. I. Taylor.
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Ng, WC., Leung, F.C.C., Chak, S.T.C. et al. Temporal genetic variation in populations of the limpet Cellana grata from Hong Kong shores. Mar Biol 157, 325–337 (2010). https://doi.org/10.1007/s00227-009-1320-0
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DOI: https://doi.org/10.1007/s00227-009-1320-0