Microsatellite and mitochondrial DNA markers show no evidence of population structure in walleye (Sander vitreus) in Lake Winnipeg

Backhouse-James, Stephanie M.; Docker, Margaret F.

doi:10.1016/j.jglr.2011.05.005

Cited by 16 publications

(8 citation statements)

References 70 publications

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“…This is strong evidence of continuing gene flow between growth forms and is consistent with recent microsatellite analyses of Lake Winnipeg walleye from across the entire lake showing very little genetic differentiation among spawning aggregations (Backhouse 2009). While there was some limited evidence for genotypic differentiation between morphotypes, the F ST estimate suggests that the genetic variability between these subpopulations is low.…”

Section: Population Structuresupporting

confidence: 78%

“…Furthermore, the individual-based Bayesian multi-locus cluster analysis indicated that a single population model fit the genetic data with the greatest likelihood in comparison with two and three population models. This is strong evidence of continuing gene flow between growth forms and is consistent with recent microsatellite analyses of Lake Winnipeg walleye from across the entire lake showing very little genetic differentiation among spawning aggregations (Backhouse 2009). Dwarf and normal walleye in the south basin appear to spawn at roughly the same time and at the same location based on the results of our field sampling.…”

Section: Population Structurementioning

confidence: 99%

“…The polymorphism of Lake Winnipeg walleye may represent two glacial lineages that either diverged separately or following their secondary contact after colonising Lake Winnipeg, as has been reported for other morphotype pairs (Bernatchez & Dodson 1990). Analysis of mitochon-drial DNA has shown that Lake Winnipeg walleye are dominated by two main haplotype groups, one originating from the Mississippi glacial refugium, the other from the Missouri refugium (Billington et al 1992;Backhouse 2009). We examined the genetic origins and divergence of walleye growth forms using mitochondrial and microsatellite DNA markers.…”

Section: Introductionmentioning

confidence: 99%

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Reproductive divergence between growth forms of Lake Winnipeg walleye (Sander vitreus)

Moles

Johnston

Robinson

et al. 2010

Ecology of Freshwater Fish

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Growth polymorphisms occur in many fish species, particularly in northern temperate freshwater lakes. The only known growth polymorphism in walleye (Sander vitreus) is in Lake Winnipeg, Canada, where slow-growing (dwarf) and fast-growing (normal) morphotypes co-exist. We examined differences in reproductive traits between forms to determine whether divergence in growth rates was accompanied by divergence in reproductive strategies and also assessed the genetic composition of both forms using mitochondrial and microsatellite DNA to determine their origin and potential reproductive isolation. Both sexes of the dwarf form produced relatively larger gonads than the normal form. Female dwarfs also had a lower liver lipid concentration, a higher ovary lipid concentration, and produced relatively larger eggs compared to the normal form. There was also some indication that dwarf and normal females differed in the fatty acid profiles of their egg lipids. Population genetic analysis based on partial sequencing of the mitochondrial control region and genotyping nine microsatellite loci indicated a single interbreeding population and sympatric origin for both morphotypes. The dwarf form appears to make a relatively larger reproductive investment at a given body size, and the differences between the two forms may result from plastic developmental responses to subtle differences in niche use.

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Section: Population Structuresupporting

confidence: 78%

Section: Population Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reproductive divergence between growth forms of Lake Winnipeg walleye (Sander vitreus)

Moles

Johnston

Robinson

et al. 2010

Ecology of Freshwater Fish

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“…To the west, colonists from the Missourian refugium primarily founded populations in the upper Great Plains and Canadian prairies—we term these the ‘Northwest Lake Plains’—as well as the upper Mississippi River watershed and western Lake Superior (Mandrak & Crossman ; Billington ; Stepien et al . ; Backhouse‐James & Docker ).…”

Section: Introductionmentioning

confidence: 99%

“…Notably, an estimated 90 fish species migrated northward from the Mississippian glacial refugium to found modern populations in the Laurentian Great Lakes, another 14 expanded up from the Atlantic coastal refugium and some from each met and mixed. To the west, colonists from the Missourian refugium primarily founded populations in the upper Great Plains and Canadian prairies-we term these the 'Northwest Lake Plains'-as well as the upper Mississippi River watershed and western Lake Superior (Mandrak & Crossman 1992;Billington 1996;Stepien et al 2009;Backhouse-James & Docker 2012).…”

Section: Introductionmentioning

confidence: 99%

Waterscape genetics of the yellow perch (Perca flavescens): patterns across large connected ecosystems and isolated relict populations

Sepulveda‐Villet

Stepien

2012

Molecular Ecology

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Comparisons of a species' genetic diversity and divergence patterns across large connected populations vs. isolated relict areas provide important data for understanding potential response to global warming, habitat alterations and other perturbations. Aquatic taxa offer ideal case studies for interpreting these patterns, because their dispersal and gene flow often are constrained through narrow connectivity channels that have changed over geological time and/or from contemporary anthropogenic perturbations. Our research objective is to better understand the interplay between historic influences and modern-day factors (fishery exploitation, stocking supplementation and habitat loss) in shaping population genetic patterns of the yellow perch Perca flavescens (Percidae: Teleostei) across its native North American range. We employ a modified landscape genetics approach, analysing sequences from the entire mitochondrial DNA control region and 15 nuclear DNA microsatellite loci of 664 spawning adults from 24 populations. Results support that perch from primary glacial refugium areas (Missourian, Mississippian and Atlantic) founded contemporary northern populations. Genetic diversity today is highest in southern (never glaciated) populations and also is appreciable in northern areas that were founded from multiple refugia. Divergence is greater among isolated populations, both north and south; the southern Gulf Coast relict populations are the most divergent, reflecting their long history of isolation. Understanding the influence of past and current waterway connections on the genetic structure of yellow perch populations may help us to assess the roles of ongoing climate change and habitat disruptions towards conserving aquatic biodiversity.

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Genomic signals found using RNA sequencing show signatures of selection and subtle population differentiation in walleye (Sander vitreus) in a large freshwater ecosystem

Thorstensen

Jeffrey

Treberg

et al. 2020

Ecology and Evolution

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RNA sequencing is an effective approach for studying aquatic species yielding both physiological and genomic data. However, its population genetic applications are not well‐characterized. We investigate this possible role for RNA sequencing for population genomics in Lake Winnipeg, Manitoba, Canada, walleye ( Sander vitreus ). Lake Winnipeg walleye represent the largest component of the second‐largest freshwater fishery in Canada. In the present study, large female walleye were sampled via nonlethal gill biopsy over two years at three spawning sites representing a latitudinal gradient in the lake. Genetic variation from sequenced mRNA was analyzed for neutral and adaptive markers to investigate population structure and possible adaptive variation. We find low population divergence ( F ST = 0.0095), possible northward gene flow, and outlier loci that vary latitudinally in transcripts associated with cell membrane proteins and cytoskeletal function. These results indicate that Lake Winnipeg walleye may be effectively managed as a single demographically connected metapopulation with contributing subpopulations and suggest genomic differences possibly underlying observed phenotypic differences. Despite its high cost relative to other genotyping methods, RNA sequencing data can yield physiological in addition to genetic information discussed here. We therefore argue that it is useful for addressing diverse molecular questions in the conservation of freshwater species.

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Microsatellite and mitochondrial DNA markers show no evidence of population structure in walleye (Sander vitreus) in Lake Winnipeg

Cited by 16 publications

References 70 publications

Reproductive divergence between growth forms of Lake Winnipeg walleye (Sander vitreus)

Reproductive divergence between growth forms of Lake Winnipeg walleye (Sander vitreus)

Waterscape genetics of the yellow perch (Perca flavescens): patterns across large connected ecosystems and isolated relict populations

Genomic signals found using RNA sequencing show signatures of selection and subtle population differentiation in walleye (Sander vitreus) in a large freshwater ecosystem

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