Publications des scientifiques de l'IRD

Durand Jean-Dominique, Guinand B., Dodson J. J., Lecomte F. (2013). Pelagic life and depth : coastal physical features in West Africa shape the genetic structure of the bonga shad, Ethmalosa fimbriata. Plos One, 8 (10), ISSN 1932-6203.

Titre du document
Pelagic life and depth : coastal physical features in West Africa shape the genetic structure of the bonga shad, Ethmalosa fimbriata
Année de publication
2013
Type de document
Article référencé dans le Web of Science WOS:000325810900139
Auteurs
Durand Jean-Dominique, Guinand B., Dodson J. J., Lecomte F.
Source
Plos One, 2013, 8 (10), ISSN 1932-6203
The bonga shad, Ethmalosa fimbriata, is a West African pelagic species still abundant in most habitats of its distribution range and thought to be only recently affected by anthropogenic pressure (habitat destruction or fishing pressure). Its presence in a wide range of coastal habitats characterised by different hydrodynamic processes, represents a case study useful for evaluating the importance of physical structure of the west African shoreline on the genetic structure of a small pelagic species. To investigate this question, the genetic diversity of E. fimbriata was assessed at both regional and species range scales, using mitochondrial (mt) and nuclear DNA markers. Whereas only three panmictic units were identified with mtDNA at the large spatial scale, nuclear genetic markers (EPIC: exon-primed intron-crossing) indicated a more complex genetic pattern at the regional scale. In the northern-most section of shad's distribution range, up to 4 distinct units were identified. Bayesian inference as well as spatial autocorrelation methods provided evidence that gene flow is impeded by the presence of deep-water areas near the coastline (restricting the width of the coastal shelf), such as the Cap Timiris and the Kayar canyons in Mauritania and Senegal, respectively. The added discriminatory power provided by the use of EPIC markers proved to be essential to detect the influence of more subtle, contemporary processes (e.g. gene flow, barriers, etc.) acting within the glacial refuges identified previously by mtDNA.
Plan de classement
Limnologie biologique / Océanographie biologique [034]
Description Géographique
AFRIQUE DE L'OUEST
Localisation
Fonds IRD [F B010061245]
Identifiant IRD
fdi:010061245
Contact