ddRAD genotyping reveals hierarchical genetic population structure in anadromous Arctic char (Salvelinus alpinus) in the Lower Northwest Passage, Nunavut

Contemporary intraspecific patterns of genetic variation reflect the historical effects of population subdivision–expansion and forces like drift, gene flow, and selection. We investigated the population structure of anadromous Arctic char (Salvelinus alpinus) in the Lower Northwest Passage (LNWP),...

Full description

Saved in:
Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 2021-04, Vol.78 (4), p.457-471
Main Authors: Li, Peiwen, van Coeverden de Groot, Peter, Clemente-Carvalho, Rute B.G, Lougheed, Stephen C
Format: Article
Language:English
Subjects:
Analysis
Bone growth
Case studies
Chromosomes
Divergence
Embryogenesis
Embryonic growth stage
Fisheries
Freshwater
Gene flow
Gene pools
Genetic diversity
Genetic drift
Genetics
Genomes
Genomics
Genotyping
Identification and classification
Migratory species
Modelling
Neurotransmission
Nucleotides
Polymorphism
Population
Population dynamics
Population genetics
Population structure
Populations
Salvelinus alpinus
Single nucleotide polymorphisms
Single-nucleotide polymorphism
Structural hierarchy
Subgroups
Sustainable development
Sustainable fisheries
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Contemporary intraspecific patterns of genetic variation reflect the historical effects of population subdivision–expansion and forces like drift, gene flow, and selection. We investigated the population structure of anadromous Arctic char (Salvelinus alpinus) in the Lower Northwest Passage (LNWP), Nunavut, using 3074 genome-wide single nucleotide polymorphisms markers (SNPs). Overall, the genetic differentiation was weak to moderate among 18 sampling locales (global F ST = 0.037). Populations were structured hierarchically, with a deeper genetic division between King William Island (global F ST = 0.018) and mainland populations ∼200 km away to the south (global F ST = 0.018), and some evidence of genetic subgroups within the former. These findings suggest a role for char migratory behaviour in shaping contemporary genetic population structure, with demographic modelling favouring an isolation with migration over a strict isolation scenario. Twenty-two SNPs were identified as potentially under divergent selection with putative functions including neurotransmission and bone development and growth during late embryogenesis. Our study is the first survey of Arctic char in the LNWP using genomics and provides baseline data for the development of a sustainable fishery within this region.
ISSN:0706-652X
1205-7533
DOI:10.1139/cjfas-2020-0069