The interaction of sexually and naturally selected traits in the adaptive radiations of cichlid fishes
Identifieur interne : 001754 ( Istex/Corpus ); précédent : 001753; suivant : 001755The interaction of sexually and naturally selected traits in the adaptive radiations of cichlid fishes
Auteurs : Walter SalzburgerSource :
- Molecular Ecology [ 0962-1083 ] ; 2009-01.
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Abstract
The question of how genetic variation translates into organismal diversity has puzzled biologists for decades. Despite recent advances in evolutionary and developmental genetics, the mechanisms that underlie adaptation, diversification and evolutionary innovation remain largely unknown. The exceptionally diverse species flocks of cichlid fishes are textbook examples of adaptive radiation and explosive speciation and emerge as powerful model systems to study the genetic basis of animal diversification. East Africa's hundreds of endemic cichlid species are akin to a natural mutagenesis screen and differ greatly not only in ecologically relevant (hence naturally selected) characters such as mouth morphology and body shape, but also in sexually selected traits such as coloration. One of the most fascinating aspects of cichlid evolution is the frequent occurrence of evolutionary parallelisms, which has led to the question whether selection alone is sufficient to produce these parallel morphologies, or whether a developmental or genetic bias has influenced the direction of diversification. Here, I review fitness‐relevant traits that could be responsible for the cichlids’ evolutionary success and assess whether these were shaped by sexual or natural selection. I then focus on the interaction and the relative importance of sexual vs. natural selection in cichlid evolution. Finally, I discuss what is currently known about the genes underlying the morphogenesis of adaptively relevant traits and highlight the importance of the forthcoming cichlid genomes in the quest of the genetic basis of diversification in this group.
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DOI: 10.1111/j.1365-294X.2008.03981.x
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Journal compilation © 2008 Blackwell Publishing Ltd</copyright><eventGroup><event type="firstOnline" date="2008-11-04"></event><event type="publishedOnlineFinalForm" date="2009-01-14"></event><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:2.3.2 mode:FullText source:HeaderRef result:HeaderRef" date="2010-03-10"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:4.0.1" date="2014-03-20"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.1.7 mode:FullText,remove_FC" date="2014-10-31"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="169">169</numbering><numbering type="pageLast" number="185">185</numbering></numberingGroup><correspondenceTo> Walter Salzburger, Fax: +41 61 267 0301; E‐mail: <email>walter.salzburger@unibas.ch</email></correspondenceTo><linkGroup><link type="toTypesetVersion" href="file:MEC.MEC3981.pdf"></link></linkGroup></publicationMeta><contentMeta><unparsedEditorialHistory>Received 17 July 2008; revision received 17 September 2008; accepted 27 September 2008</unparsedEditorialHistory><countGroup><count type="figureTotal" number="2"></count><count type="tableTotal" number="0"></count><count type="formulaTotal" number="0"></count><count type="referenceTotal" number="178"></count><count type="wordTotal" number="9096"></count></countGroup><titleGroup><title type="main">The interaction of sexually and naturally selected traits in the adaptive radiations of cichlid fishes</title><title type="shortAuthors">W. SALZBURGER</title><title type="short">THE ADAPTIVE RADIATIONS OF CICHLID FISHES</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#aff-1-1"><personName><givenNames>WALTER</givenNames><familyName>SALZBURGER</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="aff-1-1" countryCode="CH"><unparsedAffiliation>Zoological Institute, University of Basel, Vesalgasse 1, 4051 Basel, Switzerland</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">adaptive evolution</keyword><keyword xml:id="k2">evo‐devo</keyword><keyword xml:id="k3">evolutionary genomics</keyword><keyword xml:id="k4">explosive speciation</keyword><keyword xml:id="k5">organismal diversification</keyword><keyword xml:id="k6">parallel evolution</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">Abstract</title><p>The question of how genetic variation translates into organismal diversity has puzzled biologists for decades. 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Here, I review fitness‐relevant traits that could be responsible for the cichlids’ evolutionary success and assess whether these were shaped by sexual or natural selection. I then focus on the interaction and the relative importance of sexual vs. natural selection in cichlid evolution. 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Despite recent advances in evolutionary and developmental genetics, the mechanisms that underlie adaptation, diversification and evolutionary innovation remain largely unknown. The exceptionally diverse species flocks of cichlid fishes are textbook examples of adaptive radiation and explosive speciation and emerge as powerful model systems to study the genetic basis of animal diversification. East Africa's hundreds of endemic cichlid species are akin to a natural mutagenesis screen and differ greatly not only in ecologically relevant (hence naturally selected) characters such as mouth morphology and body shape, but also in sexually selected traits such as coloration. One of the most fascinating aspects of cichlid evolution is the frequent occurrence of evolutionary parallelisms, which has led to the question whether selection alone is sufficient to produce these parallel morphologies, or whether a developmental or genetic bias has influenced the direction of diversification. Here, I review fitness‐relevant traits that could be responsible for the cichlids’ evolutionary success and assess whether these were shaped by sexual or natural selection. I then focus on the interaction and the relative importance of sexual vs. natural selection in cichlid evolution. 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