Autosomal differences between males and females in hybrid zones: a first report from Barbus barbus and Barbus meridionalis (Cyprinidae)

Narrow hybrid zones are generally subjected to the action of two forces: dispersal, which tends to homogenise the hybridising taxa, and selection against hybrids, which, in contrast, produces steep clines of introgression for diagnostic markers. Although differences between sexes in dispersal abilit...

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Bibliographic Details
Published in:Heredity 2004-08, Vol.93 (2), p.128-134
Main Authors: Chenuil, A, Crespin, L, Pouyaud, L, Berrebi, P
Format: Article
Language:English
Subjects:
Age Factors
Animals
Biodiversity and Ecology
Biomedical and Life Sciences
Biomedicine
Chromosomes - genetics
Cyprinidae - genetics
Cytogenetics
Dispersal
domain_sde.be.gp
Ecology
Environmental Sciences
Evolutionary Biology
Female
Fertility
France
Freshwater
Gene Frequency
Genetic Variation
Genetics, Population
Geography
Human Genetics
Hybridization, Genetic
Hybrids
Isoenzymes
Male
Microsatellite Repeats - genetics
original-article
Plant Genetics and Genomics
Population Dynamics
Rivers
Selection, Genetic
Survival
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Summary:Narrow hybrid zones are generally subjected to the action of two forces: dispersal, which tends to homogenise the hybridising taxa, and selection against hybrids, which, in contrast, produces steep clines of introgression for diagnostic markers. Although differences between sexes in dispersal abilities or in susceptibility to hybrid counterselection are common in hybrid zones, autosomal genetic differences between males and females have never been reported to our knowledge. Barbus barbus and Barbus meridionalis (Cyprinidae) form a hybrid zone along the Lergue river. By carrying out a genetic analysis of males and females in six samples from two central stations of the hybrid zone using codominant markers (six allozymes and four microsatellite loci), we revealed significant multilocus and monolocus differences between the sexes. This could reflect a genetic difference among sexes within a same cohort, caused either by a survival (or fertility) differential among sexes or by a sex-specific pattern of dispersal. Alternatively, this may be due to genetic differentiation between cohorts, since male and female barbel exhibit different maturation, growth and survival patterns leading to different age distributions among sexes, and particularly among reproducers.
ISSN:0018-067X
1365-2540
0018-067X
DOI:10.1038/sj.hdy.6800455