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Marine Biology

, Volume 161, Issue 11, pp 2609–2619 | Cite as

Phenotypic variation in shell form in the intertidal acorn barnacle Chthamalus montagui: distribution, response to predators and life history trade-offs

  • Jefferson Murua
  • Michael T. Burrows
  • Roger N. Hughes
  • Stephen J. Hawkins
  • Richard C. Thompson
  • Stuart R. Jenkins
Original Paper

Abstract

The acorn barnacle Chthamalus montagui can present strong variation in shell morphology, ranging from flat conic to a highly bent form, caused by a substantial overgrowth of the rostrum plate. Shell shape distribution was investigated between January and May 2004 from geographical to microhabitat spatial scales along the western coast of Britain. Populations studied in the north (Scotland and Isle of Man) showed a higher degree of shell variation compared to those in the south (Wales and south-west England). In the north, C. montagui living at lower tidal levels and in proximity to the predatory dogwhelk, Nucella lapillus, were more bent in profile. Laboratory experiments were conducted to examine behavioural responses, and vulnerability of bent and conic barnacles to predation by N. lapillus. Dogwhelks did not attack one morphotype more than the other, but only 15 % of attacks on bent forms were successful compared to 75 % in conic forms. Dogwhelk effluent reduced the time spent feeding by C. montagui (11 %), but there was no significant difference between conic and bent forms. Examination of barnacle morphology indicated a trade-off in investment in shell structure and feeding appendages associated with being bent, but none with egg or somatic tissue mass. These results are consistent with C. montagui showing an induced defence comparable to that found in its congeners Chthamalus anisopoma and Chthamalus fissus on the Pacific coast of North America, but further work to demonstrate inducibility is required.

Keywords

Tidal Height Shell Shape Shell Deformation Lively 1986a Morph Type 
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 study was supported by a NERC New Investigator Award to S. R. Jenkins. Special thanks are due to Georgina Budd, Patricia Masterson and Thea De Kline for providing much appreciated assistance in the field, and Kevin Atkins, Peter Rendle and John Rundle for technical support. J.M. is grateful to Prof. R. D. Pingree and Prof. A. J. Southward for offering their comments and expertise on oceanography and rocky shore ecology, respectively, and also indebted to many people at SAMS in Scotland, who generously cooperated in fieldwork surveys. Thanks to two anonymous reviewers for assistance in substantially improving the manuscript.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Jefferson Murua
    • 1
    • 2
  • Michael T. Burrows
    • 3
  • Roger N. Hughes
    • 4
  • Stephen J. Hawkins
    • 1
    • 5
  • Richard C. Thompson
    • 6
  • Stuart R. Jenkins
    • 1
    • 7
  1. 1.Marine Biological Association of the United KingdomCitadel Hill, PlymouthUK
  2. 2.Azti-TecnaliaSukarrietaSpain
  3. 3.Dunstaffnage Marine LaboratoryScottish Association for Marine SciencesOban, ArgyllUK
  4. 4.School of Biological SciencesBangor UniversityGwyneddUK
  5. 5.Ocean and Earth Science, National Oceanography Centre SouthamptonUniversity of SouthamptonSouthamptonUK
  6. 6.School of Marine Science and EngineeringPlymouth UniversityPlymouthUK
  7. 7.School of Ocean SciencesBangor UniversityMenai Bridge, AngleseyUK

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