Article (Scientific journals)
Conséquences génétiques et morphologiques des glaciations du Quaternaire : une lignée relique du barbeau (Luciobarbus pallaryi, Cyprinidae) dans le bassin du Guir (Algerie)
Brahimi, Amina; Tarai, Nacer; Benhassane, Abdelkrim et al.
2016In Comptes Rendus Biologies, 339, p. 83-98
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Keywords :
Luciobarbus pallaryi; Allopatric lineage; Saalian glaciation; Guir; Algeria
Abstract :
[en] Climatic variations during the Quaternary period had a considerable impact on landscapes and habitat fragmentation (rivers) in North Africa. These historical events can have significant consequences on the genetic structure of the populations. Indeed, geographi- cally separated and genetically isolated populations tend to differentiate themselves through time, eventually becoming distinct lineages, allowing new species to emerge in later generations. The aim of the present study is to use genetic and morphological techniques to evaluate the major role of the Saalian glaciation (Middle Quaternary) in the establishment of the geographic space and in the evolution of the intraspecific genetic diversity, by tracing the demographic history of barbels belonging to the Luciobarbus pallaryi (Cyprinidae) species in the Guir Basin (Algeria). In this context, two populations, from two distinct and isolated sites, were studied. Analysis of the cytochrome b (cyt b) mitochondrial markers and of the ‘‘D-loop’’ control region has shown that the ‘‘upstream’’ and ‘‘downstream’’ Guir populations are genetically differentiated. The molecular analyses suggest that the upstream population was disconnected from this hydrographic system during the Saalian glaciation period of the Quaternary. Subsequently, it was isolated in the foggaras underground waters in the Great Western Erg, at approximately 320 000 years BP, creating, through a bottleneck effect, a new allopatric lineage referred to as ‘‘Adrar’’. Conversely, the high genetic diversity in the upstream Guir (Bechar) population suggests that the stock is globally in expansion. These barbels (n = 52) were also examined with meristic, morphometric, osteological, and biological features
Disciplines :
Zoology
Author, co-author :
Brahimi, Amina
Tarai, Nacer
Benhassane, Abdelkrim
Henrard, Arnaud
Libois, Roland ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Zoogéographie
Language :
English
Title :
Conséquences génétiques et morphologiques des glaciations du Quaternaire : une lignée relique du barbeau (Luciobarbus pallaryi, Cyprinidae) dans le bassin du Guir (Algerie)
Alternative titles :
[en] Genetic and morphological consequences of Quaternary glaciations: A relic barbel lineage (Luciobarbus pallaryi, Cyprinidae) of Guir Basin (Algeria)
Publication date :
February 2016
Journal title :
Comptes Rendus Biologies
ISSN :
1631-0691
Publisher :
Elsevier, Paris, France
Volume :
339
Pages :
83-98
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 27 February 2016

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