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

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• 作者：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)
  
• 刊名：Marine Biology
• 出版年：2014
• 出版时间：November 2014
• 年：2014
• 卷：161
• 期：11
• 页码：2609-2619
• 全文大小：431 KB
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• 作者单位：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. Marine Biological Association of the United Kingdom, Citadel Hill, Plymouth, PL1 2PB, UK
  2. Azti-Tecnalia, Txatxarramendi Ugartea, z/g, 48395, Sukarrieta, Spain
  3. Dunstaffnage Marine Laboratory, Scottish Association for Marine Sciences, PO Box 3, Oban, Argyll, PA34 4AD, UK
  4. School of Biological Sciences, Bangor University, Gwynedd, LL57 2UW, UK
  5. Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, European Way, Southampton, SO14 3ZH, UK
  6. School of Marine Science and Engineering, Plymouth University, Plymouth, PL4 8AA, UK
  7. School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey, LL59 5AB, UK
  
• ISSN：1432-1793

文摘

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.