Sympatric speciation in palms on an oceanic island.

Détails

ID Serval
serval:BIB_0276B7CEA41E
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Sympatric speciation in palms on an oceanic island.
Périodique
Nature
Auteur⸱e⸱s
Savolainen V., Anstett M.C., Lexer C., Hutton I., Clarkson J.J., Norup M.V., Powell M.P., Springate D., Salamin N., Baker W.J.
ISSN
1476-4687 (Electronic)
ISSN-L
0028-0836
Statut éditorial
Publié
Date de publication
2006
Peer-reviewed
Oui
Volume
441
Numéro
7090
Pages
210-213
Langue
anglais
Résumé
The origin of species diversity has challenged biologists for over two centuries. Allopatric speciation, the divergence of species resulting from geographical isolation, is well documented. However, sympatric speciation, divergence without geographical isolation, is highly controversial. Claims of sympatric speciation must demonstrate species sympatry, sister relationships, reproductive isolation, and that an earlier allopatric phase is highly unlikely. Here we provide clear support for sympatric speciation in a case study of two species of palm (Arecaceae) on an oceanic island. A large dated phylogenetic tree shows that the two species of Howea, endemic to the remote Lord Howe Island, are sister taxa and diverged from each other well after the island was formed 6.9 million years ago. During fieldwork, we found a substantial disjunction in flowering time that is correlated with soil preference. In addition, a genome scan indicates that few genetic loci are more divergent between the two species than expected under neutrality, a finding consistent with models of sympatric speciation involving disruptive/divergent selection. This case study of sympatric speciation in plants provides an opportunity for refining theoretical models on the origin of species, and new impetus for exploring putative plant and animal examples on oceanic islands.
Mots-clé
Altitude, Animals, Anthozoa/physiology, Arecaceae/classification, Arecaceae/genetics, Flowers/physiology, Gene Pool, Genetic Speciation, Genome, Plant, Geography, Hydrogen-Ion Concentration, Molecular Sequence Data, Oceans and Seas, Phylogeny, Plant Roots/physiology, Soil/analysis, Species Specificity
Pubmed
Web of science
Création de la notice
24/01/2008 18:41
Dernière modification de la notice
20/08/2019 12:24
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