Data: Environmentally associated chromosomal structural variation influences fine-scale population structure of Atlantic Salmon

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Description:

Chromosomal rearrangements (e.g., inversions, fusions, and translocations) have long been associated with environmental variation in wild populations. New genomic tools provide the opportunity to examine the role of these structural variants in shaping adaptive differences within and among wild populations of non-model organisms. In Atlantic Salmon (Salmo salar), variations in chromosomal rearrangements exist across the species natural range, yet the role and importance of these structural variants in maintaining adaptive differences among wild populations remains poorly understood. We genotyped Atlantic Salmon (n = 1429) from 26 populations within a highly genetically structured region of southern Newfoundland, Canada with a 220K SNP array. Multivariate analysis, across two independent years, consistently identified variation in a structural variant (translocation between chromosomes Ssa01 and Ssa23), previously associated with evidence of trans-Atlantic secondary contact, as the dominant factor influencing population structure in the region. Redundancy analysis suggested that variation in the Ssa01/Ssa23 chromosomal translocation is strongly correlated with temperature. Our analyses suggest environmentally mediated selection acting on standing genetic variation in genomic architecture introduced through secondary contact may underpin fine-scale local adaptation in Placentia Bay, Newfoundland, Canada, a large and deep embayment, highlighting the importance of chromosomal structural variation as a driver of contemporary adaptive divergence.

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Author(s):

Watson, Beth

Watson, Beth

Dalhousie University

, Lehnert, Sarah

Lehnert, Sarah

Northwest Atlantic Fisheries Centre

, Bentzen, Paul

Bentzen, Paul

Dalhousie University

, Kess, Tony

Kess, Tony

Northwest Atlantic Fisheries Centre

, Einfeldt, Anthony

Einfeldt, Anthony

Dalhousie University

, Duffy, Steven

Duffy, Steven

Northwest Atlantic Fisheries Centre

, Perriman, Ben

Perriman, Ben

Dalhousie University

, Lien, Sigbjorn

Lien, Sigbjorn

Centre for Integrative Genetics

, Kent, Matthew

Kent, Matthew

Centre for Integrative Genetics

, and Bradbury, Ian

Bradbury, Ian

Northwest Atlantic Fisheries Centre

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Source Repository:

Dryad

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License:

https://creativecommons.org/publicdomain/zero/1.0/

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URL:

https://doi.org/10.5061/dryad.931zcrjmg

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Publication date:

2021-12-17

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Keywords:

Chromosomal Structural Variation, translocation, Secondary Contact, and Atlantic salmon

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APA Citation:

Watson, B., Lehnert, S., Bentzen, P., Kess, T., Einfeldt, A., Duffy, S., Perriman, B., Lien, S., Kent, M., & Bradbury, I. (2021). Data: Environmentally associated chromosomal structural variation influences fine-scale population structure of Atlantic Salmon [Data set]. Dryad. https://doi.org/10.5061/dryad.931zcrjmg

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