Variation in mitochondrial DNA and post-glacial colonization of north western Europe by brown trout

Hynes, Rosaleen

doi:10.1006/jfbi.1996.0005

Cited by 28 publications

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“…Our results were in contrast to the 'Stream Hierarchy Model' [48], which showed that the distribution of genetic variation would follow different basins. Similar results were found in many studies of freshwater fish species [5,9,49,50], including Opsariichthys bidens (Teleostei, Cyprinidae) conducted in the Pearl River and the Yangze River in China [8]. However, some researchers [10,11,16] have reported population genetic structure in some freshwater fish species being analogous to our study, and these provided evidence that the contemporary drainage structure did not coincide with the genetic relationships among populations, or that the instream barriers and complex population histories played an important role in the determination of the population genetic structure.…”

Section: Discussionsupporting

confidence: 91%

Complex population genetic and demographic history of the Salangid, Neosalanx taihuensis, based on cytochrome b sequences

et al. 2008

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BackgroundThe Salangid icefish Neosalanx taihuensis (Salangidae) is an economically important fish, which is endemic to China, restricted to large freshwater systems (e.g. lakes, large rivers and estuaries) and typically exhibit low vagility. The continuous distribution ranges from the temperate region of the Huai and Yellow River basins to the subtropical region of the Pearl River basin. This wide ranging distribution makes the species an ideal model for the study of palaeoclimatic effects on population genetic structure and phylogeography. Here, we aim to analyze population genetic differentiation within and between river basins and demographic history in order to understand how this species responded to severe climatic oscillations, decline of the sea levels during the Pleistocene ice ages and tectonic activity.ResultsWe obtained the complete mtDNA cytochrome b sequences (1141 bp) of 354 individuals from 13 populations in the Pearl River, the Yangze River and the Huai River basin. Thirty-six haplotypes were detected. Haplotype frequency distributions were strongly skewed, with most haplotypes (n = 24) represented only in single samples each and thus restricted to a single population. The most common haplotype (H36) was found in 49.15% of all individuals. Analysis of molecular variance (AMOVA) revealed a random pattern in the distribution of genetic diversity, which is inconsistent with contemporary hydrological structure. Significant levels of genetic subdivision were detected among populations within basins rather than between the three basins. Demographic analysis revealed that the population size in the Pearl River basin has remained relatively constant whereas the populations in the Yangze River and the Huai River basins expanded about 221 and 190 kyr ago, respectively, with the majority of mutations occurring after the last glacial maximum (LGM).ConclusionThe observed complex genetic pattern of N. taihuensis is coherent with a scenario of multiple unrelated founding events by long-distance colonization and dispersal combined with contiguous population expansion and locally restricted gene flow. We also found that this species was likely severely impacted by past glaciations. More favourable climate and the formation of large suitable habitations together facilitated population expansion after the late Quaternary (especially the LGM). We proposed that all populations should be managed and conserved separately, especially for habitat protection.

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Section: Discussionsupporting

confidence: 91%

Complex population genetic and demographic history of the Salangid, Neosalanx taihuensis, based on cytochrome b sequences

et al. 2008

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“…The results also agree with previous analyses of mtDNA genome based on RFLP data indicating high divergence between native Spanish and more northern-Atlantic populations (Hynes et al, 1996;Machordom et al, 2000). A conservative calibration based on the higher rate of nucleotide substitution applied to the salmonid control region (2% per million of years, Bernatchez et al, 1992) is sufficient to indicate that the northern and Iberian haplotypes diverged at least in the order of 135 000-350 000 years ago, overpassing the time of Atlantic brown trout divergences detected in previous studies (13 400-26 800 years ago, Bernatchez, 2001).…”

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Evidence for phylogeographically informative sequence variation in the mitochondrial control region of Atlantic brown trout

Cortey

García‐Marín

2002

Journal of Fish Biology

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“…Detailed studies, which have examined genetic diversity in both natural and farm stocks of brown trout from throughout Britain and Ireland, and placing this diversity in the context of that found elsewhere in north-western Europe, show that this contention is untrue (Ferguson, 1989(Ferguson, , 2004Stephen & McAndrew, 1990;Hynes et al, 1996;Duguid, 2002;McKeown, 2005). Loss of genetic diversity leads to lowered abundance, lowered recruitment and greater uniformity in life-history characteristics.…”

Section: Implications Of Genetic Differentiation Among Populationsmentioning

confidence: 99%

Genetics of Sea Trout, with Particular Reference to Britain and Ireland

Ferguson

2007

Sea Trout: Biology, Conservation and Management

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Variation in mitochondrial DNA and post-glacial colonization of north western Europe by brown trout

Cited by 28 publications

References 0 publications

Complex population genetic and demographic history of the Salangid, Neosalanx taihuensis, based on cytochrome b sequences

Complex population genetic and demographic history of the Salangid, Neosalanx taihuensis, based on cytochrome b sequences

Evidence for phylogeographically informative sequence variation in the mitochondrial control region of Atlantic brown trout

Genetics of Sea Trout, with Particular Reference to Britain and Ireland

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