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Analyses of amplified fragment length polymorphisms (AFLP) indicate rapid radiation of Diospyros species (Ebenaceae) endemic to New Caledonia
- Source :
- BMC Evolutionary Biology
- Publication Year :
- 2013
- Publisher :
- Springer Science and Business Media LLC, 2013.
-
Abstract
- Background : Radiation in some plant groups has occurred on islands and due to the characteristic rapid pace of phenotypic evolution, standard molecular markers often provide insufficient variation for phylogenetic reconstruction. To resolve relationships within a clade of 21 closely related New Caledonian Diospyros species and evaluate species boundaries we analysed genome-wide DNA variation via amplified fragment length polymorphisms (AFLP). Results : A neighbour-joining (NJ) dendrogram based on Dice distances shows all species except D. minimifolia,D. parviflora and D. vieillardii to form unique clusters of genetically similar accessions. However, there was little variation between these species clusters, resulting in unresolved species relationships and a star-like general NJ topology. Correspondingly, analyses of molecular variance showed more variation within species than between them. A Bayesian analysis with BEAST produced a similar result. Another Bayesian method, this time a clustering method, STRUCTURE, demonstrated the presence of two groups, highly congruent with those observed in a principal coordinate analysis (PCO). Molecular divergence between the two groups is low and does not correspond to any hypothesised taxonomic, ecological or geographical patterns. Conclusions : We hypothesise that such a pattern could have been produced by rapid and complex evolution involving a widespread progenitor for which an initial split into two groups was followed by subsequent fragmentation into many diverging populations, which was followed by range expansion of then divergent entities. Overall, this process resulted in an opportunistic pattern of phenotypic diversification. The time since divergence was probably insufficient for some species to become genetically well-differentiated, resulting in progenitor/derivative relationships being exhibited in a few cases. In other cases, our analyses may have revealed evidence for the existence of cryptic species, for which more study of morphology and ecology are now required.
- Subjects :
- 0106 biological sciences
Species complex
DNA, Plant
ESPECE ENDEMIQUE
Range (biology)
Plant genetics
Species radiation
Island flora
Biology
010603 evolutionary biology
01 natural sciences
03 medical and health sciences
ARBRE
New Caledonia
ETUDE COMPARATIVE
Cluster Analysis
PHYLOGENIE
Amplified Fragment Length Polymorphism Analysis
Clade
Ecology, Evolution, Behavior and Systematics
030304 developmental biology
0303 health sciences
Polymorphism, Genetic
Ecology
Progenitor/derivative relationships
RELATION INTERSPECIFIQUE
Dendrogram
Woody plants
Bayes Theorem
Diospyros
Biological Evolution
EVOLUTION
GENOME
Phylogeography
Evolutionary biology
Cryptic species
ETUDE EXPERIMENTALE
Amplified fragment length polymorphism
Morphological diversification
ILE
ANALYSE AFLP
Research Article
Subjects
Details
- ISSN :
- 14712148
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- BMC Evolutionary Biology
- Accession number :
- edsair.doi.dedup.....09341f2a2de54ed1572e87001ee0312c