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High levels of interspecific gene flow in an endemic cichlid fish adaptive radiation from an extreme lake environment

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High levels of interspecific gene flow in an endemic cichlid fish adaptive radiation from an extreme lake environment. / Ford, Antonia G P; Dasmahapatra, Kanchon K.; Rüber, Lukas; Gharbi, Karim; Cezard, Timothee; Day, Julia J.

In: Molecular Ecology, Vol. 24, No. 13, 19.06.2015, p. 3421-3440.

Research output: Contribution to journalArticle

Harvard

Ford, AGP, Dasmahapatra, KK, Rüber, L, Gharbi, K, Cezard, T & Day, JJ 2015, 'High levels of interspecific gene flow in an endemic cichlid fish adaptive radiation from an extreme lake environment', Molecular Ecology, vol. 24, no. 13, pp. 3421-3440. https://doi.org/10.1111/mec.13247

APA

Ford, A. G. P., Dasmahapatra, K. K., Rüber, L., Gharbi, K., Cezard, T., & Day, J. J. (2015). High levels of interspecific gene flow in an endemic cichlid fish adaptive radiation from an extreme lake environment. Molecular Ecology, 24(13), 3421-3440. https://doi.org/10.1111/mec.13247

Vancouver

Ford AGP, Dasmahapatra KK, Rüber L, Gharbi K, Cezard T, Day JJ. High levels of interspecific gene flow in an endemic cichlid fish adaptive radiation from an extreme lake environment. Molecular Ecology. 2015 Jun 19;24(13):3421-3440. https://doi.org/10.1111/mec.13247

Author

Ford, Antonia G P ; Dasmahapatra, Kanchon K. ; Rüber, Lukas ; Gharbi, Karim ; Cezard, Timothee ; Day, Julia J. / High levels of interspecific gene flow in an endemic cichlid fish adaptive radiation from an extreme lake environment. In: Molecular Ecology. 2015 ; Vol. 24, No. 13. pp. 3421-3440.

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@article{a89210f2ba9d4e3e8398f52ce41ba0d2,
title = "High levels of interspecific gene flow in an endemic cichlid fish adaptive radiation from an extreme lake environment",
abstract = "Studying recent adaptive radiations in isolated insular systems avoids complicating causal events and thus may offer clearer insight into mechanisms generating biological diversity. Here, we investigate evolutionary relationships and genomic differentiation within the recent radiation of Alcolapia cichlid fish that exhibit extensive phenotypic diversification, and which are confined to the extreme soda lakes Magadi and Natron in East Africa. We generated an extensive RAD data set of 96 individuals from multiple sampling sites and found evidence for genetic admixture between species within Lake Natron, with the highest levels of admixture between sympatric populations of the most recently diverged species. Despite considerable environmental separation, populations within Lake Natron do not exhibit isolation by distance, indicating panmixia within the lake, although individuals within lineages clustered by population in phylogenomic analysis. Our results indicate exceptionally low genetic differentiation across the radiation despite considerable phenotypic trophic variation, supporting previous findings from smaller data sets; however, with the increased power of densely sampled SNPs, we identify genomic peaks of differentiation (FST outliers) between Alcolapia species. While evidence of ongoing gene flow and interspecies hybridization in certain populations suggests that Alcolapia species are incompletely reproductively isolated, the identification of outlier SNPs under diversifying selection indicates the radiation is undergoing adaptive divergence.",
keywords = "adaptive radiation, admixture, Alcolapia, cichlid, hybridization, Lake Magadi, Lake Natron, Oreochromis, RAD",
author = "Ford, {Antonia G P} and Dasmahapatra, {Kanchon K.} and Lukas R{\"u}ber and Karim Gharbi and Timothee Cezard and Day, {Julia J.}",
year = "2015",
month = "6",
day = "19",
doi = "10.1111/mec.13247",
language = "English",
volume = "24",
pages = "3421--3440",
journal = "Molecular Ecology",
issn = "0962-1083",
publisher = "Wiley-Blackwell",
number = "13",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - High levels of interspecific gene flow in an endemic cichlid fish adaptive radiation from an extreme lake environment

AU - Ford, Antonia G P

AU - Dasmahapatra, Kanchon K.

AU - Rüber, Lukas

AU - Gharbi, Karim

AU - Cezard, Timothee

AU - Day, Julia J.

PY - 2015/6/19

Y1 - 2015/6/19

N2 - Studying recent adaptive radiations in isolated insular systems avoids complicating causal events and thus may offer clearer insight into mechanisms generating biological diversity. Here, we investigate evolutionary relationships and genomic differentiation within the recent radiation of Alcolapia cichlid fish that exhibit extensive phenotypic diversification, and which are confined to the extreme soda lakes Magadi and Natron in East Africa. We generated an extensive RAD data set of 96 individuals from multiple sampling sites and found evidence for genetic admixture between species within Lake Natron, with the highest levels of admixture between sympatric populations of the most recently diverged species. Despite considerable environmental separation, populations within Lake Natron do not exhibit isolation by distance, indicating panmixia within the lake, although individuals within lineages clustered by population in phylogenomic analysis. Our results indicate exceptionally low genetic differentiation across the radiation despite considerable phenotypic trophic variation, supporting previous findings from smaller data sets; however, with the increased power of densely sampled SNPs, we identify genomic peaks of differentiation (FST outliers) between Alcolapia species. While evidence of ongoing gene flow and interspecies hybridization in certain populations suggests that Alcolapia species are incompletely reproductively isolated, the identification of outlier SNPs under diversifying selection indicates the radiation is undergoing adaptive divergence.

AB - Studying recent adaptive radiations in isolated insular systems avoids complicating causal events and thus may offer clearer insight into mechanisms generating biological diversity. Here, we investigate evolutionary relationships and genomic differentiation within the recent radiation of Alcolapia cichlid fish that exhibit extensive phenotypic diversification, and which are confined to the extreme soda lakes Magadi and Natron in East Africa. We generated an extensive RAD data set of 96 individuals from multiple sampling sites and found evidence for genetic admixture between species within Lake Natron, with the highest levels of admixture between sympatric populations of the most recently diverged species. Despite considerable environmental separation, populations within Lake Natron do not exhibit isolation by distance, indicating panmixia within the lake, although individuals within lineages clustered by population in phylogenomic analysis. Our results indicate exceptionally low genetic differentiation across the radiation despite considerable phenotypic trophic variation, supporting previous findings from smaller data sets; however, with the increased power of densely sampled SNPs, we identify genomic peaks of differentiation (FST outliers) between Alcolapia species. While evidence of ongoing gene flow and interspecies hybridization in certain populations suggests that Alcolapia species are incompletely reproductively isolated, the identification of outlier SNPs under diversifying selection indicates the radiation is undergoing adaptive divergence.

KW - adaptive radiation

KW - admixture

KW - Alcolapia

KW - cichlid

KW - hybridization

KW - Lake Magadi

KW - Lake Natron

KW - Oreochromis

KW - RAD

UR - http://www.scopus.com/inward/record.url?scp=84933278858&partnerID=8YFLogxK

U2 - 10.1111/mec.13247

DO - 10.1111/mec.13247

M3 - Article

C2 - 25997156

AN - SCOPUS:84933278858

VL - 24

SP - 3421

EP - 3440

JO - Molecular Ecology

JF - Molecular Ecology

SN - 0962-1083

IS - 13

ER -