Y-chromosome haplotypes are associated with variation in size and age at maturity in male Chinook salmon.

Autor: McKinney GJ; School of Aquatic and Fishery Sciences University of Washington Seattle WA USA., Seeb JE; School of Aquatic and Fishery Sciences University of Washington Seattle WA USA., Pascal CE; School of Aquatic and Fishery Sciences University of Washington Seattle WA USA., Schindler DE; School of Aquatic and Fishery Sciences University of Washington Seattle WA USA., Gilk-Baumer SE; Alaska Department of Fish and Game Anchorage AK USA., Seeb LW; School of Aquatic and Fishery Sciences University of Washington Seattle WA USA.
Jazyk: angličtina
Zdroj: Evolutionary applications [Evol Appl] 2020 Aug 28; Vol. 13 (10), pp. 2791-2806. Date of Electronic Publication: 2020 Aug 28 (Print Publication: 2020).
DOI: 10.1111/eva.13084
Abstrakt: Variation in size and age at maturity is an important component of life history that is influenced by both environmental and genetic factors. In salmonids, large size confers a direct reproductive advantage through increased fecundity and egg quality in females, while larger males gain a reproductive advantage by monopolizing access to females. In addition, variation in size and age at maturity in males can be associated with different reproductive strategies; younger smaller males may gain reproductive success by sneaking among mating pairs. In both sexes, there is a trade-off between older age and increased reproductive success and increased risk of mortality by delaying reproduction. We identified four Y-chromosome haplogroups that showed regional- and population-specific variation in frequency using RADseq data for 21 populations of Alaska Chinook salmon. We then characterized the range-wide distribution of these haplogroups using GT-seq assays. These haplogroups exhibited associations with size at maturity in multiple populations, suggesting that lack of recombination between X and Y-chromosomes has allowed Y-chromosome haplogroups to capture different alleles that influence size at maturity. Ultimately, conservation of life history diversity in Chinook salmon may require conservation of Y-chromosome haplotype diversity.
Competing Interests: None declared.
(© 2020 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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