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- W2790396970 abstract "AEI Aquaculture Environment Interactions Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AEI 10:99-113 (2018) - DOI: https://doi.org/10.3354/aei00261 Differences in fitness-associated traits between hatchery and wild chum salmon despite long-term immigration by strays Casey J. McConnell1,*, Peter A. H. Westley2, Megan V. McPhee1 1College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, 17101 Point Lena Loop Rd, Juneau, AK 99801, USA 2College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, 905 N. Koyukuk Drive, Fairbanks, AK 99775, USA *Corresponding author: casey.fishes@gmail.com ABSTRACT: To assess the potential for introgression and competition between hatchery-produced (Hp) and natural-origin (No) chum salmon Oncorhynchus keta, we quantified a suite of fitness-related morphological and life-history traits on the spawning grounds of a small creek in Southeast Alaska that has high rates of immigration from nearby hatchery programs. Using thermally marked otoliths to distinguish between Hp and No fish, we estimated that 51.4% of individuals examined in 2015 were Hp strays. Compared with their No counterparts, Hp males and females entered the creek significantly later, were younger at maturity, smaller in body length, and smaller for a given age. On average, Hp females lived 2 d less on the spawning grounds than No females and also had higher rates of egg retention (47 vs. 19% observed in No females). The observed phenotypic differences between the local No and Hp individuals suggest barriers to introgression through combinations of selection against strays or spatio-temporal segregation on the spawning grounds, though the phenotypic baseline of the No population prior to potential hatchery influence is not known, nor is the extent to which environmental plasticity may be influencing trait expression. Although rates of interbreeding may be sufficiently low to currently maintain phenotypic differences between No and Hp strays, at least some spawning did occur by the majority of Hp individuals. Ultimately, it remains unclear how long the presumably adaptive phenotype of the No population may persist given the consistently large numbers of strays appearing annually on the spawning grounds. KEY WORDS: Homing · Dispersal · Enhancement · Hatchery · Competition · Introgression · Local adaptation · Oncorhynchus keta Full text in pdf format PreviousNextCite this article as: McConnell CJ, Westley PAH, McPhee MV (2018) Differences in fitness-associated traits between hatchery and wild chum salmon despite long-term immigration by strays. Aquacult Environ Interact 10:99-113. https://doi.org/10.3354/aei00261 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AEI Vol. 10. Online publication date: April 10, 2018 Print ISSN: 1869-215X; Online ISSN: 1869-7534 Copyright © 2018 Inter-Research." @default.
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- W2790396970 date "2018-04-10" @default.
- W2790396970 modified "2023-10-14" @default.
- W2790396970 title "Differences in fitness-associated traits between hatchery and wild chum salmon despite long-term immigration by strays" @default.
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- W2790396970 doi "https://doi.org/10.3354/aei00261" @default.