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Marine Biology

, Volume 157, Issue 4, pp 765–778 | Cite as

No evidence for genetic differentiation between Antarctic limpet Nacella concinna morphotypes

  • J. I. HoffmanEmail author
  • L. S. Peck
  • G. Hillyard
  • A. Zieritz
  • M. S. Clark
Original Paper

Abstract

The extent to which genetic divergence can occur in the absence of physical barriers to gene flow is currently one of the most controversial topics in evolutionary biology, with implications for our understanding of speciation, phenotypic plasticity and adaptive potential. This is illustrated by a recent study reporting a surprising pattern of genetic differentiation between intertidal and subtidal morphotypes of the broadcast-spawning Antarctic limpet Nacella concinna. To explore this further, we collected almost 400 Antarctic limpets from four depths (intertidal, 6, 15 and 25 m) at Adelaide island, Antarctica, and conducted a combined morphometric and genetic analysis using 168 polymorphic amplified fragment length polymorphism (AFLP) loci. Morphological analysis revealed not only pronounced differences between the two morphotypes, but also a continuous cline in shell shape from the intertidal zone down to 25 m depth, suggesting that the distinction between the morphotypes may be artificial. Moreover, genetic analysis using both F st and a Bayesian analogue found no evidence for differentiation either between the two morphotypes or by depth, and a Bayesian cluster analysis did not detect any cryptic genetic structure. Our findings lend support to the notion that limpets can be phenotypically highly plastic, although further studies are required to determine unequivocally whether there is any genetic basis to the observed variation in shell morphology.

Keywords

Amplify Fragment Length Polymorphism Intertidal Zone Deviance Information Criterion Polymorphic Amplify Fragment Length Shell Shape 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This paper was produced within the BAS Q4 BIOREACH/BIOFLAME core program. The authors would like to thank the Rothera Dive Team for providing samples, Peter Fretwell for making Figure 1 and Pete Rothery for statistical advice and Kanchon Dasmahapatra, Geerat Vermeij and three anonymous referees for helpful comments that improved the manuscript. Overall diving support was provided by the NERC National Facility for Scientific Diving at Oban. JH was supported by a Natural Environment Research Council (NERC) British Antarctic Survey (BAS) Strategic Alliance Fellowship.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • J. I. Hoffman
    • 1
    Email author
  • L. S. Peck
    • 2
  • G. Hillyard
    • 2
  • A. Zieritz
    • 1
  • M. S. Clark
    • 2
  1. 1.Department of ZoologyUniversity of CambridgeCambridgeUK
  2. 2.British Antarctic Survey, Natural Environment Research CouncilCambridgeUK

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