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- W2314929250 abstract "Estuaries, at the confluence of marine and freshwater systems, are mostly of geolog- ically recent origin and as such make excellent models for understanding recent speciation events. Using molecular approaches, we compared genetic diversity and demographic histories in 2 closely related southern African klipfish species, the marine Clinus superciliosus and the estuar- ine C. spatulatus. Strong genetic differentiation was identified using both mtDNA control region and nDNA S7 sequencing, despite some haplotype sharing. Coalescent-based modelling suggests that species divergence occurred during the Late Pleistocene or, more likely, during the Early Holocene, when present-day estuaries formed. Analyses of population demography suggest that C. superciliosus has undergone historical population expansion, whereas C. spatulatus is charac- terized by a population decline, potentially driven by repeated cycles of population crashes linked to the opening and closing of estuarine systems. This is also reflected in values of genetic diversity, which are almost an order of magnitude lower in the estuarine than in the marine species. Given the unique evolutionary history of C. spatulatus, a species that is restricted to only 2 South African estuaries, we highlight the need for a better understanding of the processes that have shaped the evolution of estuarine populations. The identification of unique genetic lineages in estuaries can help to better guide conservation and management efforts for some of South Africa's most fragile habitats." @default.
- W2314929250 created "2016-06-24" @default.
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- W2314929250 date "2015-04-22" @default.
- W2314929250 modified "2023-10-16" @default.
- W2314929250 title "Contrasting signals of genetic diversity and historical demography between two recently diverged marine and estuarine fish species" @default.
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- W2314929250 doi "https://doi.org/10.3354/meps11191" @default.
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