Skip Navigation



ICES Journal of Marine Science: Journal du Conseil Advance Access published online on December 23, 2008
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsn206
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
66/2/264    most recent
fsn206v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Chlaida, M.
Right arrow Articles by Planes, S.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Chlaida, M.
Right arrow Articles by Planes, S.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Evidence of a genetic cline for Sardina pilchardus along the Northwest African coast

M. Chlaida1, V. Laurent2, S. Kifani1, T. Benazzou3, H. Jaziri3 and S. Planes2

1 Institut National de Recherche Halieutique, 2 Rue de Tiznit, Casablanca 20000, Maroc
2 UMR 5244 CNRS-EPHE-UPVD, Université de Perpignan, Avenue Paul Alduy, 66860 Perpignan Cedex, France
3 Faculté des Sciences, BP 1014, Avenue Ibn Batouta, Agdal, 10 106 Rabat, Maroc

Correspondence to M. Chlaida: tel: +212 22220249; fax: +212 22266967; e-mail: ma_chlaida{at}hotmail.com.

Chlaida, M., Laurent, V., Kifani, S., Benazzou, T., Jaziri, H., and Planes, S. 2009. Evidence of a genetic cline for Sardina pilchardus along the Northwest African coast. – ICES Journal of Marine Science, 66: 000–000.

In all, 700 Sardina pilchardus from 14 locations throughout the Atlantic and Mediterranean Moroccan coastlines were screened for eight enzymatic loci that show polymorphism. Analysis of allelic frequencies showed a genetic break in the area of the Bay of Agadir, segregating two groups of samples, confirmed by analysis of molecular variance; a first consisting of Sidi Ifni (29°12'N) and southern samples down to the southern limit of the species in Mauritania (19°03'N 16°28'W), and a second starting in the Bay of Agadir (30°48'N) and consisting of northern samples that appeared homogeneous with the Mediterranean samples. Specifically, a survey of the SOD* loci demonstrated a genetic cline in allelic frequencies along the coastline. Using a clinal variation model under a state of equilibrium, we estimate a dispersal rate of 189 ± 52 km per generation between Mauritania and Ras Kebdana. This major break towards the south of the Bay of Agadir offers a new perspective on the management of sardine, which ideally ought now to be managed as two stocks along the Moroccan coast. The break is most likely induced by hydrodynamic influences that virtually isolate southern from northern populations.

Keywords: allozymes, genetic cline, marine fish, Northwest Africa, Sardina pilchardus

Received 16 May 2008; accepted 4 November 2008.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.