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Morphological and genetic variation in the North Atlantic copepod, Centropages typicus

Published online by Cambridge University Press:  26 July 2011

Claudia Castellani ,
Alistair J. Lindley ,
Marianne Wootton ,
Christopher M. Lee  and
Richard R. Kirby
Claudia Castellani*
Affiliation:
Sir Alister Hardy Foundation for Ocean Science, Citadel Hill, The Hoe, Plymouth PL1 2PB, UK
Alistair J. Lindley
Affiliation:
Sir Alister Hardy Foundation for Ocean Science, Citadel Hill, The Hoe, Plymouth PL1 2PB, UK
Marianne Wootton
Affiliation:
Sir Alister Hardy Foundation for Ocean Science, Citadel Hill, The Hoe, Plymouth PL1 2PB, UK
Christopher M. Lee
Affiliation:
University of Edinburgh
Richard R. Kirby
Affiliation:
University of Plymouth, School of Marine Science and Engineering, Drake Circus, Plymouth PL4 8AA, UK
*
Correspondence should be addressed to: Claudia Castellani, Sir Alister Hardy Foundation for Ocean Science, Citadel Hill, The Hoe, Plymouth PL1 2PB, UK email: cxc@sahfos.ac.uk
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Abstract

This study describes phenotypic and genotypic variations in the planktonic copepod, Centropages typicus (Copepoda: Calanoida) that indicate differentiation between geographical samples. We found consistent differences in the morphology of the chela of the sexually modified fifth pereiopod (P5) of male C. typicus between samples from the Mediterranean, western North Atlantic and eastern North Atlantic. A 560 base pairs (bp) region of the C. typicus mitochondrial cytochrome c oxidase subunit I (COI) and a 462 bp fragment of the nuclear rDNA internal transcribed spacer (ITS) tandem array were analysed to determine whether these morphological variations reflect population genetic differentiation. Mitochondrial haplotype diversity was found to be high with 100 unique COI haplotypes among 116 individuals. Analysis of mtCOI variation suggested differentiation between the Mediterranean and Atlantic populations but no separation was detected within the Atlantic. Intragenomic variation in the ITS array suggested genetic differentiation between samples from the western North Atlantic and those from the eastern North Atlantic and Mediterranean. Breeding experiments would be required to elucidate the extent of genetic isolation between C. typicus from the different population centres.

Keywords

Centropages typicusphenotypic variationgenotypic variationcryptic speciespopulation diversity
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 92 , Issue 1 , February 2012 , pp. 99 - 106
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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