Population structure and colour variation of the cichlid fishes Labeotropheus fuelleborni Ahl along a recently formed archipelago of rocky habitat patches in southern Lake Malawi

Extremely fine-scale genetic partitioning has recently been detected among populations of Lake Malawi's rock-dwelling cichlids through the study of microsatellite loci. Understanding the mechanisms of genetic differentiation that operate in this rapidly speciating group requires further investi...

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Hlavní autoři: Arnegard, M. E., Markert, J. A., Danley, P. D., Stauffer, J. R., Ambali, A. J., Kocher, T. D.
Médium: Článek
Jazyk:English
Vydáno: 1999
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Article
On-line přístup:https://ncbi.nlm.nih.gov/pmc/articles/PMC1689659/
https://ncbi.nlm.nih.govhttp://dx.doi.org/10.1098/rspb.1999.0611
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spelling pubmed-16896592007-03-05 Population structure and colour variation of the cichlid fishes Labeotropheus fuelleborni Ahl along a recently formed archipelago of rocky habitat patches in southern Lake Malawi Arnegard, M. E. Markert, J. A. Danley, P. D. Stauffer, J. R. Ambali, A. J. Kocher, T. D. Proc Biol Sci Article Extremely fine-scale genetic partitioning has recently been detected among populations of Lake Malawi's rock-dwelling cichlids through the study of microsatellite loci. Understanding the mechanisms of genetic differentiation that operate in this rapidly speciating group requires further investigation of the geographic patterns of gene flow and the congruence between morphological and genetic divergence. In pursuit of this goal, genetic variation at four microsatellite loci and variation in male breeding coloration were examined in several populations of Labeotropheus fuelleborni from southern Lake Malawi. Significant genetic differentiation exists among populations (overall F(ST) = 0.063; p = 0.0002). While migration appears unrestricted within continuous rocky patches, deep waters and sandy bays more than 2 km wide act as strong barriers to gene flow. Dispersal of L. fuelleborni appears to follow a stepping-stone model in which the distribution of habitats often constrains migration to one dimension. It is hypothesized that clinal colour variation in the study area has resulted from the secondary contact of divergent lineages, although reproductive isolation between colour variants is not apparent. Relative to shoreline populations, reduced levels of gene flow among populations inhabiting isolated, deep-water islands provides greater opportunities for drift, adaptation to local conditions, or sexual selection to effect genetic differentiation in this species. 1999-01-22 /pmc/articles/PMC1689659/ http://dx.doi.org/10.1098/rspb.1999.0611 Text en
institution US National Library of Medicine
collection PubMed Central
language English
format Article
topic Article
spellingShingle Article
Arnegard, M. E.
Markert, J. A.
Danley, P. D.
Stauffer, J. R.
Ambali, A. J.
Kocher, T. D.
Population structure and colour variation of the cichlid fishes Labeotropheus fuelleborni Ahl along a recently formed archipelago of rocky habitat patches in southern Lake Malawi
description Extremely fine-scale genetic partitioning has recently been detected among populations of Lake Malawi's rock-dwelling cichlids through the study of microsatellite loci. Understanding the mechanisms of genetic differentiation that operate in this rapidly speciating group requires further investigation of the geographic patterns of gene flow and the congruence between morphological and genetic divergence. In pursuit of this goal, genetic variation at four microsatellite loci and variation in male breeding coloration were examined in several populations of Labeotropheus fuelleborni from southern Lake Malawi. Significant genetic differentiation exists among populations (overall F(ST) = 0.063; p = 0.0002). While migration appears unrestricted within continuous rocky patches, deep waters and sandy bays more than 2 km wide act as strong barriers to gene flow. Dispersal of L. fuelleborni appears to follow a stepping-stone model in which the distribution of habitats often constrains migration to one dimension. It is hypothesized that clinal colour variation in the study area has resulted from the secondary contact of divergent lineages, although reproductive isolation between colour variants is not apparent. Relative to shoreline populations, reduced levels of gene flow among populations inhabiting isolated, deep-water islands provides greater opportunities for drift, adaptation to local conditions, or sexual selection to effect genetic differentiation in this species.
author Arnegard, M. E.
Markert, J. A.
Danley, P. D.
Stauffer, J. R.
Ambali, A. J.
Kocher, T. D.
author_facet Arnegard, M. E.
Markert, J. A.
Danley, P. D.
Stauffer, J. R.
Ambali, A. J.
Kocher, T. D.
author_sort Arnegard, M. E.
title Population structure and colour variation of the cichlid fishes Labeotropheus fuelleborni Ahl along a recently formed archipelago of rocky habitat patches in southern Lake Malawi
title_short Population structure and colour variation of the cichlid fishes Labeotropheus fuelleborni Ahl along a recently formed archipelago of rocky habitat patches in southern Lake Malawi
title_full Population structure and colour variation of the cichlid fishes Labeotropheus fuelleborni Ahl along a recently formed archipelago of rocky habitat patches in southern Lake Malawi
title_fullStr Population structure and colour variation of the cichlid fishes Labeotropheus fuelleborni Ahl along a recently formed archipelago of rocky habitat patches in southern Lake Malawi
title_full_unstemmed Population structure and colour variation of the cichlid fishes Labeotropheus fuelleborni Ahl along a recently formed archipelago of rocky habitat patches in southern Lake Malawi
title_sort population structure and colour variation of the cichlid fishes labeotropheus fuelleborni ahl along a recently formed archipelago of rocky habitat patches in southern lake malawi
publishDate 1999
url https://ncbi.nlm.nih.gov/pmc/articles/PMC1689659/
https://ncbi.nlm.nih.govhttp://dx.doi.org/10.1098/rspb.1999.0611
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