Divergent and narrower climatic niches characterize polyploid species of European primroses in Primula sect. Aleuritia

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Serval ID
serval:BIB_FF4FFF55394C
Type
Article: article from journal or magazin.
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Institution
Title
Divergent and narrower climatic niches characterize polyploid species of European primroses in Primula sect. Aleuritia
Journal
Journal of Biogeography
Author(s)
Theodoridis S., Randin C., Broennimann O., Patsiou T., Conti E.
ISSN
0305-0270
Publication state
Published
Issued date
2013
Peer-reviewed
Oui
Volume
40
Number
7
Pages
1278-1289
Language
english
Abstract
Aim It is hypothesized that the ecological niches of polyploids should be both distinct and broader than those of diploids - characteristics that might have allowed the successful colonization of open habitats by polyploids during the Pleistocene glacial cycles. Here, we test these hypotheses by quantifying and comparing the ecological niches and niche breadths of a group of European primroses. Location Europe. Methods We gathered georeferenced data of four related species in Primula sect. Aleuritia at different ploidy levels (diploid, tetraploid, hexaploid and octoploid) and used seven bioclimatic variables to quantify niche overlap between species by applying a series of univariate and multivariate analyses combined with modelling techniques. We also employed permutation-based tests to evaluate niche similarity between the four species. Niche breadth for each species was evaluated both in the multivariate environmental space and in geographical space. Results The four species differed significantly from each other in mono-dimensional comparisons of climatological variables and occupied distinct habitats in the multi-dimensional environmental space. The majority of the permutation-based tests either indicated that the four species differed significantly in their habitat preferences and ecological niches or did not support significant niche similarity. Furthermore, our results revealed narrower niche breadths and geographical ranges in species of P. sect. Aleuritia at higher ploidy levels. Main conclusions The detected ecological differentiation between the four species of P. sect. Aleuritia at different ploidy levels is consistent with the hypothesis that polyploids occupy distinct ecological niches that differ from those of their diploid relative. Contrary to expectations, we find that polyploid species of P. sect. Aleuritia occupy narrower environmental and geographical spaces than their diploid relative. These results on the ecological niches of closely related polyploid and diploid species highlight factors that potentially contribute to the evolution and distribution of polyploid species.
Keywords
Allopolyploidy, Europe, macroecology of polyploidy, niche breadth, niche overlap, niche similarity, polyploid speciation, Primulaceae, secondary contact
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Create date
20/12/2012 13:07
Last modification date
20/08/2019 17:29
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