The accumulation of reproductive incompatibilities in African cichlid fish.

Détails

Ressource 1Télécharger: BIB_B288115772AD.P001.pdf (448.85 [Ko])
Etat: Public
Version: Final published version
ID Serval
serval:BIB_B288115772AD
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
The accumulation of reproductive incompatibilities in African cichlid fish.
Périodique
Evolution
Auteur(s)
Stelkens R.B., Young K.A., Seehausen O.
ISSN
1558-5646[electronic], 0014-3820[linking]
Statut éditorial
Publié
Date de publication
09/2010
Peer-reviewed
Oui
Volume
64
Numéro
3
Pages
617-633
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
The rate at which different components of reproductive isolation accumulate with divergence time between species has only been studied in a limited, but growing, number of species. We measured premating isolation and hybrid inviability at four different ontogenetic stages from zygotes to adults in interspecific hybrids of 26 pairs of African cichlid species, spanning the entire East African haplochromine radiation. We then used multiple relaxed molecular clock calibrations to translate genetic distances into absolute ages to compare evolutionary rates of different components of reproductive isolation. We find that premating isolation accumulates fast initially but then changes little with increasing genetic distance between species. In contrast, postmating isolation between closely related species is negligible but then accumulates rapidly, resulting in complete hybrid inviability after 4.4/8.5/18.4 million years (my). Thus, the rate at which complete intrinsic incompatibilities arise in this system is orders of magnitude lower than rates of speciation within individual lake radiations. Together these results suggest divergent ecological adaptations may prevent populations from interbreeding and help maintain cichlid species diversity, which may be vulnerable to environmental degradation. By quantifying the capacity to produce viable hybrids between allopatric, distantly related lineages our results also provide an upper divergence time limit for the "hybrid swarm origin" model of adaptive radiation.
Mots-clé
Adaptive radiation, cichlid fish, divergence time, genetic distance, hybrid (in)viability, relaxed molecular clock, reproductive isolation, speciation
Pubmed
Web of science
Open Access
Oui
Création de la notice
22/06/2009 12:43
Dernière modification de la notice
20/08/2019 15:21
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