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Nuclear markers reveal unexpected genetic variation and a Congolese-Nilotic origin of the Lake Victoria cichlid species flock

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dc.contributor.authorSeehausen, Ole
dc.contributor.authorKoetsier, Egbert
dc.contributor.authorSchneider, Maria Victoria
dc.contributor.authorChapman, Lauren J.
dc.contributor.authorChapman, Colin A.
dc.contributor.authorKnight, Mairi E.
dc.contributor.authorTurner, George F.
dc.contributor.authorvan Alphen, Jacques J. M.
dc.contributor.authorBills, Roger
dc.date.accessioned2024-10-15T06:45:27Z
dc.date.available2024-10-15T06:45:27Z
dc.date.issued2003
dc.description.abstractPhylogenetic analyses based on mitochondrial (mt) DNA have indicated that the cichlid species flock of the Lake Victoria region is derived from a single ancestral species found in East African rivers, closely related to the ancestor of the Lake Malawi cichlid species flock. The Lake Victoria flock contains ten times less mtDNA variation than the Lake Malawi radiation, consistent with current estimates of the ages of the lakes. We present results of a phylogenetic investigation using nuclear (amplified fragment length polymorphism) markers and a wider coverage of riverine haplochromines. We demonstrate that the Lake Victoria–Edward flock is derived from the morphologically and ecologically diverse cichlid genus Thoracochromis from the Congo and Nile, rather than from the phenotypically conservative East African Astatotilapia. This implies that the ability to express much of the morphological diversity found in the species flock may by far pre–date the origin of the flock. Our data indicate that the nuclear diversity of the Lake Victoria–Edward species flock is similar to that of the Lake Malawi flock, indicating that the genetic diversity is considerably older than the 15 000 years that have passed since the lake began to refill. Most of this variation is manifested in trans–species polymorphisms, indicating very recent cladogenesis from a genetically very diverse founder stock. Our data do not confirm strict monophyly of either of the species flocks, but raise the possibility that these flocks have arisen from hybrid swarms.
dc.description.numberOfPages9
dc.description.sponsorshipInstitut für Ökologie und Evolution, Aquatische Ökologie
dc.identifier.doi10.7892/boris.49595
dc.identifier.publisherDOI10.1098/rspb.2002.2153
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/119915
dc.language.isoen
dc.publisherRoyal Society of London
dc.relation.ispartofProceedings of the Royal Society. Series B - biological sciences
dc.relation.issn0962-8452
dc.relation.organizationDCD5A442C44BE17DE0405C82790C4DE2
dc.subjectAdaptive Radiation
dc.subjectAmplified Fragment Length Polymorphisms
dc.subjectCichlid Fish
dc.subjectExplosive Speciation
dc.subjectHybridization
dc.subjectLake Victoria
dc.subject.ddc500 - Science::570 - Life sciences; biology
dc.titleNuclear markers reveal unexpected genetic variation and a Congolese-Nilotic origin of the Lake Victoria cichlid species flock
dc.typearticle
dspace.entity.typePublication
dspace.file.typetext
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oaire.citation.endPage137
oaire.citation.issue1511
oaire.citation.startPage129
oaire.citation.volume270
oairecerif.author.affiliationInstitut für Ökologie und Evolution, Aquatische Ökologie
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unibe.eprints.legacyId49595
unibe.journal.abbrevTitleP ROY SOC B-BIOL SCI
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