Evaluation of genetic isolation within an island flora reveals unusually widespread local adaptation and supports sympatric speciation.
Philos Trans R Soc Lond B Biol Sci
; 369(1648)2014 Aug 05.
Article
em En
| MEDLINE
| ID: mdl-24958917
ABSTRACT
It is now recognized that speciation can proceed even when divergent natural selection is opposed by gene flow. Understanding the extent to which environmental gradients and geographical distance can limit gene flow within species can shed light on the relative roles of selection and dispersal limitation during the early stages of population divergence and speciation. On the remote Lord Howe Island (Australia), ecological speciation with gene flow is thought to have taken place in several plant genera. The aim of this study was to establish the contributions of isolation by environment (IBE) and isolation by community (IBC) to the genetic structure of 19 plant species, from a number of distantly related families, which have been subjected to similar environmental pressures over comparable time scales. We applied an individual-based, multivariate, model averaging approach to quantify IBE and IBC, while controlling for isolation by distance (IBD). Our analyses demonstrated that all species experienced some degree of ecologically driven isolation, whereas only 12 of 19 species were subjected to IBD. The prevalence of IBE within these plant species indicates that divergent selection in plants frequently produces local adaptation and supports hypotheses that ecological divergence can drive speciation in sympatry.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Plantas
/
Adaptação Biológica
/
Especiação Genética
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Isolamento Reprodutivo
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Dispersão Vegetal
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Ilhas
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Modelos Genéticos
Tipo de estudo:
Prognostic_studies
/
Risk_factors_studies
País/Região como assunto:
Oceania
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article