Population genetic structure of the perlemoen Haliotis midae in South Africa: evidence of range expansion and founder events
TLDR
It is concluded that populations of H. midae on either side of Cape Agulhas represent 2 independent reproductive stocks, and the area of transition between the stocks coincides with oceanographic features of the region.Abstract:
Genetic diversity in Haliotis midae, a highly valued and heavily exploited marine gastropod, was assessed using 3 marker types across samples from the species' range in South Africa. Variation was compared at 7 allozyme loci, 2 regions of mitochondrial DNA and 3 microsatellite loci. We conclude that populations of H. midae on either side of Cape Agulhas represent 2 independent reproductive stocks. The area of transition between the stocks coincides with oceanographic features of the region. Evidence from all 3 types of genetic marker indicates an isolated introduction event to the east of Cape Agulhas, and subsequent range expansion in an easterly direction. The disparity between allozyme data and the other 2 forms is seen as further evidence for the presence of balanc- ing selection at allozyme loci.read more
Citations
More filters
Journal ArticleDOI
Reduced genetic diversity and alteration of gene flow in a fiddler crab due to mangrove degradation
Alex Nehemia,Marc Kochzius +1 more
TL;DR: Results indicate that salt farming has a significant negative impact on the genetic diversity of A. occidentalis and since higher genetic diversity contributes to a stable population, restoring the cleared habitats might be the most effective measures for the conservation of genetic diversity and hence adaptive potential to environmental change in this species.
Journal ArticleDOI
Genetic Connectivity Among Pink Abalone Haliotis corrugata Populations
TL;DR: The understanding of genetic connectivity among populations is important for the management of fisheries, particularly in overexploited benthic species such as the pink abalone Haliotis corrugata, which might have limited dispersal because of a short-term pelagic larval stage.
Journal ArticleDOI
Determining the most appropriate feeding regime for the South African abalone Haliotis midae Linnaeus grown on kelp
TL;DR: This study has shown that periodic bouts of starvation is beneficial to Haliotis midae, allowing variable growth spurts when returned to full feed rations.
Journal ArticleDOI
The influence of pleistocene climatic changes and ocean currents on the phylogeography of the Southern African Barnacle, Tetraclita serrata (Thoracica; Cirripedia)
TL;DR: The mtDNA haplotype network, Bayesian Skyline Plots, mismatch distributions and time since expansion indicate that T. serrata population numbers were not severely affected by the Last Glacial Maximum (LGM), unlike other southern African marine species.
Adaptations in allopatric populations of Triakis megalopterus isolated by the Benguela Current: steps towards understanding evolutionary processes affecting regional biodiversity
TL;DR: This chapter discusses the genetic connectivity of Triakis megalopterus across its southern African distribution and discusses population demographics and genetic diversity and population differentiation.
References
More filters
Journal ArticleDOI
Estimating F-statistics for the analysis of population structure.
Bruce S. Weir,C. Clark Cockerham +1 more
TL;DR: The purpose of this discussion is to offer some unity to various estimation formulae and to point out that correlations of genes in structured populations, with which F-statistics are concerned, are expressed very conveniently with a set of parameters treated by Cockerham (1 969, 1973).
Book
Molecular Evolutionary Genetics
TL;DR: Recent developments of statistical methods in molecular phylogenetics are reviewed and it is shown that the mathematical foundations of these methods are not well established, but computer simulations and empirical data indicate that currently used methods produce reasonably good phylogenetic trees when a sufficiently large number of nucleotides or amino acids are used.
Journal ArticleDOI
GENEPOP (Version 1.2): Population Genetics Software for Exact Tests and Ecumenicism
Michel Raymond,François Rousset +1 more
Journal ArticleDOI
Genetic distance between populations
TL;DR: If enough data are available, genetic distance between any pair of organisms can be measured in terms of D, and this measure is applicable to any kind of organism without regard to ploidy or mating scheme.
Book
Molecular Markers, Natural History, and Evolution
TL;DR: A history of Molecular Phylogenetics and applications of individuality and Parentage, issues of Heterozygosity, and special Approaches to Phylageny Estimation are reviewed.