Causes and consequences of contrasting genetic structure in sympatrically growing and closely related species

AoB Plants
Ivan RadosavljevićZlatko Liber

Abstract

Gene flow, natural selection and genetic drift are processes that play a major role in shaping the genetic structure of natural populations. In addition, genetic structures of individual populations are strongly correlated with their geographical position within the species distribution area. The highest levels of genetic variation are usually found in the centre of a species' distribution and tend to decrease beyond that point. Additionally, narrowly endemic taxa are expected to be characterized by lower levels of genetic variation than their widespread congeners. To understand the historical circumstances that shape populations of sympatric and closely related taxa, microsatellite markers were used, while populations of the three closely related and sympatric Mediterranean Salvia species (S. officinalis L., S. fruticosa Mill. and S. brachyodon Vandas) served as a study model. In the populations of widespread S. officinalis, located in the central parts of this species' distribution area, no population genetic disturbances were detected. The narrow endemic S. brachyodon showed heterozygote excess, clonal reproduction and a genetic bottleneck. Because the genetic bottleneck was likely caused by the disappearance of suitable ope...Continue Reading

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Methods Mentioned

BETA
PCR

Software Mentioned

GeneMapper
GENEPOP
STRUCTURE
GIMLET
SAS
SplitsTree4
BOTTLENECK
NEWHYBRIDS
GenClone
STRUCTURE HARVESTER

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