Do genomics and sex predict migration in a partially migratory salmonid fish, Oncorhynchus mykiss?

Partial migration is a common phenomenon wherein populations include migratory and resident individuals. Whether an individual migrates or not has important ecological and management implications, particularly within protected populations. Within partially migratory populations of Oncorhynchus mykis...

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Published in:	Canadian journal of fisheries and aquatic sciences 2019-11, Vol.76 (11), p.2080-2088
Main Authors:	Kelson, Suzanne J, Miller, Michael R, Thompson, Tasha Q, O’Rourke, Sean M, Carlson, Stephanie M
Format:	Article
Language:	eng
Subjects:	Analysis Animal populations Book publishing Catadromous fishes Chromosomes Fish Fish migration Fishes Freshwater Gender Gene expression Genetic diversity Genetic variation Genomics Genotype & phenotype Genotypes Juveniles Life history Marine fishes Migrations Nucleotides Oncorhynchus mykiss Polymorphism Populations Rivers Salmon Sex Single nucleotide polymorphisms Single-nucleotide polymorphism Studies Tributaries Trout
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Summary:	Partial migration is a common phenomenon wherein populations include migratory and resident individuals. Whether an individual migrates or not has important ecological and management implications, particularly within protected populations. Within partially migratory populations of Oncorhynchus mykiss, migration is highly correlated with a specific genomic region, but it is unclear how well this region predicts migration at the individual level. Here, we relate sex and life history genotype, determined using >400 single nucleotide polymorphisms (SNPs) on the migratory-linked genomic region, to life history expression of marked juvenile O. mykiss from two tributaries to the South Fork Eel River, northern California. Most resident fish were resident genotypes (57% resident, 37% heterozygous, 6% migratory genotype) and male (78%). Most migratory fish were female (62%), but were a mixture of genotypes (30% resident, 45% heterozygous, 25% migratory genotype). Sex was more strongly correlated with life history expression than genotype, but the best-supported model included both. Resident genotypes regularly migrated, highlighting the importance of conserving the full suite of life history and genetic diversity in partially migratory populations.
ISSN:	0706-652X 1205-7533