Is hybridization driving the evolution of climatic niche in Alyssum montanum.

Détails

ID Serval
serval:BIB_A49D942D5B81
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Is hybridization driving the evolution of climatic niche in Alyssum montanum.
Périodique
American journal of botany
Auteur(s)
Arrigo N., de La Harpe M., Litsios G., Zozomová-Lihová J., Španiel S., Marhold K., Barker M.S., Alvarez N.
ISSN
1537-2197 (Electronic)
ISSN-L
0002-9122
Statut éditorial
Publié
Date de publication
07/2016
Peer-reviewed
Oui
Volume
103
Numéro
7
Pages
1348-1357
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
After decades of interest, the contribution of hybridization to ecological diversification remains unclear. Hybridization is a potent source of novelty, but nascent hybrid lineages must overcome reproductive and ecological competition from their parental species. Here, we assess whether hybrid speciation is advantageous over alternative modes of speciation, by comparing the geographical and ecological ranges and climatic niche evolutionary rates of stabilized allopolyploid vs. autopolyploids in the Alyssum montanum species complex.
We combined an extensive review of studies addressing the systematics and genetic diversity of A. montanum s.l., with flow cytometry and cloning of nuclear markers, to establish the ploidy level and putative hybrid nature of 205 populations. The respective geographic distribution and climatic niche evolution dynamics of the allo- and autopolyploids were investigated using multivariate analyses and comparative phylogenetic approaches.
As expected by theory, allopolyploids occur mainly along contact zones and are generally spatially overlapping with their diploid counterparts. However, they demonstrate higher rates of niche evolution and expand into different climatic conditions than those of their diploid congeners. In contrast, autopolyploids show lower rates of niche evolution, occupy ecological niches similar to their ancestors and are restricted to less competitive and peripheral geographic areas.
Hybridization thus seems advantageous by promoting ecological niche evolution and more readily allowing escape from competitive exclusion.

Mots-clé
Biological Evolution, Brassicaceae/genetics, Climate, Diploidy, Ecology, Genetic Variation, Geography, Hybridization, Genetic, Phylogeny, Ploidies, Brassicaceae, allopolyploidy, autopolyploidy, competition, diversification, ecological novelty, local adaptation, minority cytotype disadvantage, transgressive segregation
Pubmed
Web of science
Open Access
Oui
Création de la notice
22/03/2016 11:48
Dernière modification de la notice
08/05/2019 23:09
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