Effects of an autocorrelated stochastic environment and fisheries on the age at maturity of Chinook salmon

2007 ◽  
Vol 1 (2) ◽  
pp. 89-101 ◽  
Author(s):  
Masami Fujiwara
Keyword(s):  
Chinook Salmon ◽  
Stochastic Environment ◽  
Age At Maturity

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

2019 ◽  
Author(s):  
Garrett J. McKinney ◽  
James E Seeb ◽  
Carita E. Pascal ◽  
Daniel E. Schindler ◽  
Sara E. Gilk-Baumer ◽  
...  
Keyword(s):  
Life History ◽  
Reproductive Success ◽  
Y Chromosome ◽  
Chinook Salmon ◽  
Egg Quality ◽  
Haplotype Diversity ◽  
Wide Distribution ◽  
Size At Maturity ◽  
Age At Maturity ◽  
Increased Risk

ABSTRACTVariation in size and age at maturity is an important component of life history that is influenced both by 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 in 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 the 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.

Changes in life history parameters in a naturally spawning population of chinook salmon (Oncorhynchus tshawytscha) associated with releases of hatchery-reared fish

1997 ◽  
Vol 54 (6) ◽  
pp. 1235-1245 ◽  
Author(s):  
M J Unwin ◽  
G J Glova
Keyword(s):  
Life History ◽  
New Zealand ◽  
Chinook Salmon ◽  
Life History Traits ◽  
Oncorhynchus Tshawytscha ◽  
Fork Length ◽  
Age At Maturity ◽  
Natural Origin ◽  
Parent Stock ◽  
Stream Type

Chinook salmon (Oncorhynchus tshawytscha) spawning runs in Glenariffe Stream, New Zealand, exhibited significant changes in life history traits following supplementation releases of hatchery-reared juveniles. Total run strength did not change but the proportion of naturally produced fish declined to 34%. Attempts to separate spawners of natural and hatchery origin were unsuccessful, and 31-48% of natural spawners are now of hatchery origin. Hatchery males were smaller at age 2 and 3 than males of natural origin, and more often matured as jacks, producing an 86-mm decrease in mean fork length over 28 years. There was no change in length at age or age at maturity for female spawners. The proportion of jacks entering Glenariffe Stream each year was positively correlated with the proportion of jacks in the ensuing cohort. Most differences between fish of natural and hatchery origin were related to hatchery rearing practices, but the decline in age at maturity among naturally produced males appears to reflect traits inherited from parent stock of hatchery origin. Hatchery releases may also favour the survival of ocean-type fry over stream-type fry, possibly reversing a tendency for stream-type behaviour to evolve in response to the lack of estuaries on most New Zealand chinook salmon rivers.

Homing and Straying Patterns of Chinook Salmon (Oncorhynchus tshawytscha) from a New Zealand Hatchery: Spatial Distribution of Strays and Effects of Release Date

1993 ◽  
Vol 50 (6) ◽  
pp. 1168-1175 ◽  
Author(s):  
Martin J. Unwin ◽  
Thomas P. Quinn
Keyword(s):  
Spatial Distribution ◽  
New Zealand ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Complex Interaction ◽  
Research Station ◽  
Age At Maturity ◽  
Release Date

Homing and straying patterns of fall chinook salmon (Oncorhynchus tshawytscha) released from the Glenariffe Salmon Research Station on the Rakaia River, New Zealand, are reported, based on coded-wire tag recoveries from the 1978–84 brood years. Of 17 671 tagged adults recovered, 87.9% returned to the Rakaia, and the rest were recovered from 12 other catchments up to 500 km away. The number of strays entering a given river increased with discharge and with proximity to the Rakaia, but most strays were recorded in catchments north of the Rakaia. A higher proportion of salmon released in winter, when the downriver migration of naturally produced chinook is a minimum, strayed to other catchments (14.9–20.6%) than did those released at other times of the year (3.6–7.6%). However, straying within the Rakaia catchment was largely unaffected by release date, suggesting that imprinting by fry to the natal tributary is separate from imprinting by smolts to the mainstem river. There was a complex interaction between age at maturity, release date, and straying rates; straying of 4-yr-old fish was more strongly influenced by release date than straying of younger fish. Notwithstanding this interaction, straying was more prevalent among older fish.

scholarly journals Y‐chromosome haplotypes are associated with variation in size and age at maturity in male Chinook salmon

2020 ◽  
Vol 13 (10) ◽  
pp. 2791-2806
Author(s):  
Garrett J. McKinney ◽  
James E. Seeb ◽  
Carita E. Pascal ◽  
Daniel E. Schindler ◽  
Sara E. Gilk‐Baumer ◽  
...  
Keyword(s):  
Y Chromosome ◽  
Chinook Salmon ◽  
Age At Maturity

Length and Condition of Wild Chinook Salmon Smolts Influence Age at Maturity

2015 ◽  
Vol 144 (6) ◽  
pp. 1237-1248 ◽  
Author(s):  
Ian A. Tattam ◽  
James R. Ruzycki ◽  
Josh L. McCormick ◽  
Richard W. Carmichael
Keyword(s):  
Chinook Salmon ◽  
Age At Maturity

scholarly journals A mobile sex-determining region, male-specific haplotypes, and rearing environment influence age at maturity in Chinook salmon

2020 ◽  
Author(s):  
Garrett J McKinney ◽  
Krista M Nichols ◽  
Michael J Ford
Keyword(s):  
Chinook Salmon ◽  
Genetic Architecture ◽  
Chromosomal Location ◽  
Pacific Salmon ◽  
Rad Sequencing ◽  
Sex Linkage ◽  
Age At Maturity ◽  
Sequencing Data ◽  
Sexually Antagonistic Selection ◽  
Male Specific

AbstractVariation in age at maturity is an important contributor to life history and demographic variation within and among species. The optimal age at maturity can vary by sex, and the ability of each sex to evolve towards its fitness optimum depends on the genetic architecture of maturation. Using GWAS of RAD sequencing data, we show that age at maturity in Chinook salmon exhibits sex-specific genetic architecture, with age at maturity in males governed by large (up to 20Mb) male-specific haplotypes. These regions showed no such effect in females. We also provide evidence for translocation of the sex-determining gene between two different chromosomes. This has important implications for sexually antagonistic selection, particularly that sex-linkage of adaptive genes may differ within and among populations based on chromosomal location of the sex-determining gene. Our findings will facilitate research into the genetic causes of shifting demography in Chinook salmon as well as a better understanding of sex-determination in this species and Pacific salmon in general.

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