Species-specific population structure in rock-specialized sympatric cichlid species in Lake Tanganyika, East Africa.

Détails

Ressource 1Télécharger: BIB_EA9BDD4B143D.P001.pdf (700.96 [Ko])
Etat: Public
Version: Final published version
ID Serval
serval:BIB_EA9BDD4B143D
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Species-specific population structure in rock-specialized sympatric cichlid species in Lake Tanganyika, East Africa.
Périodique
Journal of Molecular Evolution
Auteur⸱e⸱s
Sefc K.M., Baric S., Salzburger W., Sturmbauer C.
ISSN
0022-2844[print], 0022-2844[linking]
Statut éditorial
Publié
Date de publication
2007
Peer-reviewed
Oui
Volume
64
Numéro
1
Pages
33-49
Langue
anglais
Résumé
Species richness and geographical phenotypic variation in East African lacustrine cichlids are often correlated with ecological specializations and limited dispersal. This study compares mitochondrial and microsatellite genetic diversity and structure among three sympatric rock-dwelling cichlids of Lake Tanganyika, Eretmodus cyanostictus, Tropheus moorii, and Ophthalmotilapia ventralis. The species represent three endemic, phylogenetically distinct tribes (Eretmodini, Tropheini, and Ectodini), and display divergent ecomorphological and behavioral specialization. Sample locations span both continuous, rocky shoreline and a potential dispersal barrier in the form of a muddy bay. High genetic diversity and population differentiation were detected in T. moorii and E. cyanostictus, whereas much lower variation and structure were found in O. ventralis. In particular, while a 7-km-wide muddy bay curtails dispersal in all three species to a similar extent, gene flow along mostly continuous habitat appeared to be controlled by distance in E. cyanostictus, further restricted by site philopatry and/or minor habitat discontinuities in T. moorii, and unrestrained in O. ventralis. In contrast to the general pattern of high gene flow along continuous shorelines in rock-dwelling cichlids of Lake Malawi, our study identifies differences in population structure among stenotopic Lake Tanganyika species. The amount of genetic differentiation among populations was not related to the degree of geographical variation of body color, especially since more phenotypic variation is observed in O. ventralis than in the genetically highly structured E. cyanostictus.
Mots-clé
Animals, Cichlids/physiology, DNA, Mitochondrial, Fresh Water, Genetic Variation, Genetics, Population, Phylogeny, Population Dynamics, Species Specificity, Zambia
Pubmed
Web of science
Création de la notice
07/10/2010 13:27
Dernière modification de la notice
20/08/2019 16:13
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