Genetic divergence among and within Arctic char (Salvelinus alpinus) populations inhabiting landlocked and sea-accessible sites in Labrador, Canada

  title={Genetic divergence among and within Arctic char (Salvelinus alpinus) populations inhabiting landlocked and sea-accessible sites in Labrador, Canada},
  author={Sarah J Salisbury and Connor Booker and Gregory R. McCracken and Tom W. Knight and Donald Keefe and Robert C Perry and Daniel E. Ruzzante},
  journal={Canadian Journal of Fisheries and Aquatic Sciences},
Anadromous, resident, and landlocked Arctic char (Salvelinus alpinus) differentially experience drift and gene flow, making them ideal for studying incipient divergence. We investigated genetic divergence within and among char occupying landlocked and sea-accessible sites in Labrador, Canada, using 11 microsatellites. Unlike anadromous char, landlocked char were highly genetically differentiated. Genetic subgroups were detected within landlocked and sea-accessible sites. Within Ramah Lake (a… 

Extensive secondary contact among three glacial lineages of Arctic Char (Salvelinus alpinus) in Labrador and Newfoundland

Labrador and Newfoundland is revealed to be a unique junction of three glacial lineages which have likely hybridized extensively in this region, implying their introgression.

The Genomic Consistency of the Loss of Anadromy in an Arctic Fish (Salvelinus alpinus)

The potentially significant genetic consequences associated with the loss of migratory capacity of diadromous fishes that have become landlocked in freshwater are poorly understood. Consistent

Extensive Secondary Contact Among Three Glacial Lineages of Arctic Char (Salvelinus alpinus) in Newfoundland and Labrador

We sequenced a portion of the D-loop region in over 1000 Arctic char (Salvelinus alpinus) samples from 67 locations across Newfoundland and Labrador to assess the extent of secondary contact among

Limited genetic parallelism underlies recent, repeated incipient speciation in geographically proximate populations of an Arctic fish (Salvelinus alpinus)

The results confirm the utility of Arctic Charr as a model for investigating the predictability of evolution and support the importance of both genetic parallelism and nonparallelism to the incipient speciation of ArcticCharr morphs.

Mitochondrial DNA and microsatellite analyses reveal strong genetic differentiation between two types of estuarine tapertail anchovies (Coilia) in Yangtze River Basin, China

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We used an array of fixed acoustic receivers (N = 42) to track the summer marine movements of 121 anadromous Arctic char (Salvelinus alpinus) equipped with acoustic transmitters at three locations in

Genomic basis of deep‐water adaptation in Arctic Charr (Salvelinus alpinus) morphs

Together, these results show that Arctic Charr morph divergence has occurred through genome-wide differentiation and elevated divergence of genes underlying multiple cellular and physiological processes, providing insight into the genomic basis of adaptation in a deep-water habitat following postglacial recolonization.

RADseq and mate choice assays reveal unidirectional gene flow among three lamprey ecotypes despite weak assortative mating: Insights into the formation and stability of multiple ecotypes in sympatry

It is found that multiple lamprey ecotypes can persist in sympatry following shifts in adaptive peaks, due to environmental change during their repeated colonization of post‐glacial regions, followed by periods of extensive gene flow among such diverging populations.

Resolving fine‐scale population structure and fishery exploitation using sequenced microsatellites in a northern fish

The results demonstrate the efficacy of sequence‐based microsatellite genotyping to advance understanding of fine‐scale population structure and harvest composition in northern and understudied species.

Genomic basis of the loss of diadromy in Galaxias maculatus: Insights from reciprocal transplant experiments

This study studied two adjacent river systems in which resident populations are genetically differentiated yet derived from the same diadromous population and showed that the two resident populations followed different evolutionary pathways by exhibiting a differential response in their capacity to survive in salt water.



Contrasting levels of strays and contemporary gene flow among anadromous populations of Arctic charr, Salvelinus alpinus (L.), in northern Norway

Arctic charr, Salvelinus alpinus (L.), occur as anadromous, resident, and landlocked populations within their circumpolar distribution. While resident Arctic charr reside in freshwater their entire

Phylogeography and postglacial dispersal of arctic charr Salvelinus alpinus in North America

Restriction fragment length polymorphism analysis of mitochondrial DNA was used to reconstruct postglacial dispersal routes of arctic charr Salvelinus alpinus in North America, and the close relationship between Labrador and Laurentian charr indicates their probable divergence during the Wisconsinan glaciation.

Genetic divergence between sympatric Arctic charr Salvelinus alpinus morphs in Gander Lake, Newfoundland: roles of migration, mutation and unequal effective population sizes

Analysis of genetic divergence between two sympatric morphs of Arctic charr Salvelinus alpinus inhabiting Gander Lake, Newfoundland lends support to the hypothesis that divergence between forms may have preceded the last glacial period.

Evidence for genetic distinction among sympatric ecotypes of Arctic char (Salvelinus alpinus) in south‐western Alaskan lakes

These data represent the first record of genetically distinct sympatric morphs of Arctic char in Alaska and provide further evidence that differences in morphology associated with feeding (gill rakers) and growth trajectories reflect niche diversification and promote genetic divergence in Holarctic populations of Arcticchar.

Genetic Variability and Structuring of Arctic Charr (Salvelinus alpinus) Populations in Northern Fennoscandia

Genetic variability in six native landlocked Arctic charr populations in northern Fennoscandia is severely reduced, and both genetic and empirical estimates of migration rates indicate a lack of gene flow between them, suggesting some northern Fenoscandian populations appear to be vulnerable to further loss of genetic variability.

Microsatellite and mitochondrial DNA assessment of population structure and stocking effects in Arctic charr Salvelinus alpinus (Teleostei: Salmonidae) from central Alpine lakes

The results suggest that long‐term stocking practices did not generally alter natural genetic partitioning, and stress the importance of considering genetic diversity of Arctic charr in the Alpine region for sound management, and show the potential usefulness of microsatellite DNAs in addressing evolutionary and conservation issues in this species.

The interplay between dispersal and gene flow in anadromous Arctic char (Salvelinus alpinus): implications for potential for local adaptation

This work used a genetic assignment approach to identify dispersers among populations of char from Baffin Island, Canada and parameterized a population genetic model showing that gene flow is probably sufficiently low to allow for local adaptation among populations, given realistic selection coefficients.

Microsatellite Analysis of Hatchery Stocks and Natural Populations of Arctic Charr, Salvelinus Alpinus, from the Nordic Region: Implications for Conservation

Semi-automated fluorescent genotyping of eight polymorphic microsatellite loci was used to assess the level of genetic diversity and population differentiation in Nordic stocks of non-anadromous

Ecological niche specialization inferred from morphological variation and otolith strontium of Arctic charr Salvelinus alpinus L. found within open lake systems of southern Baffin Island, Nunavut, Canada.

Clear morphological variation observed between small-maturing and undeveloped fish in all three lakes of the study suggests ecological niche separation between morphotypes.

Environmental factors associated with genetic and phenotypic divergence among sympatric populations of Arctic charr (Salvelinus alpinus)

The implication is that breeding habitat plays a primary role in isolating populations that differentiate by drift and that phenotypically plastic changes have either become secondarily decoupled from the genetically defined populations or were never fundamental in driving the evolution of genetic diversity in the Windermere system.