Estimating delayed density-dependent mortality in sockeye salmon (oncorhynchus nerka): a meta-analytic approach

Ransom A. Myers, Michael J. Bradford, Jessica M. Bridson, Gordon Mertz

    Research output: Contribution to journalArticle

    21 Citations (Scopus)

    Abstract

    Delayed density-dependent mortality can be a cause of the cyclic patterns in abundance observed in many populations of sockeye salmon (Oncorhynchus nerka). We used a meta-analytical approach to test for delayed density dependence using 34 time series of sockeye data. We found no consistent evidence for delayed density-dependent mortality using spawner - spring fry or spawner-recruit data. We did find evidence for delayed density-dependent mortality at a 1 year lag for the spawner - fall fry and the spawner-smolt data; however, effects at lags greater than 1 year were weak and not statistically significant. Between-cohort interactions at a 1-year lag are not sufficient to cause the observed cycles in adult abundance, although they will tend to reinforce patterns established by other mechanisms. Our results imply that reductions in fishing mortality in off-peak years should result in an increase in abundance.
    LanguageEnglish
    Pages2449-2462
    Number of pages13
    JournalCanadian Journal of Fisheries and Aquatic Sciences
    Volume54
    Issue number10
    Publication statusPublished - Oct 1997

    Fingerprint

    Oncorhynchus nerka
    mortality
    fish fry
    fishing mortality
    smolt
    smolts
    time series
    time series analysis
    testing

    Cite this

    Myers, Ransom A. ; Bradford, Michael J. ; Bridson, Jessica M. ; Mertz, Gordon. / Estimating delayed density-dependent mortality in sockeye salmon (oncorhynchus nerka): a meta-analytic approach. In: Canadian Journal of Fisheries and Aquatic Sciences. 1997 ; Vol. 54, No. 10. pp. 2449-2462.
    @article{d91972efe8fc4b8c8a6fd8eb220c3d4c,
    title = "Estimating delayed density-dependent mortality in sockeye salmon (oncorhynchus nerka): a meta-analytic approach",
    abstract = "Delayed density-dependent mortality can be a cause of the cyclic patterns in abundance observed in many populations of sockeye salmon (Oncorhynchus nerka). We used a meta-analytical approach to test for delayed density dependence using 34 time series of sockeye data. We found no consistent evidence for delayed density-dependent mortality using spawner - spring fry or spawner-recruit data. We did find evidence for delayed density-dependent mortality at a 1 year lag for the spawner - fall fry and the spawner-smolt data; however, effects at lags greater than 1 year were weak and not statistically significant. Between-cohort interactions at a 1-year lag are not sufficient to cause the observed cycles in adult abundance, although they will tend to reinforce patterns established by other mechanisms. Our results imply that reductions in fishing mortality in off-peak years should result in an increase in abundance.",
    author = "Myers, {Ransom A.} and Bradford, {Michael J.} and Bridson, {Jessica M.} and Gordon Mertz",
    note = "Copyright NRC Canada 1997.",
    year = "1997",
    month = "10",
    language = "English",
    volume = "54",
    pages = "2449--2462",
    journal = "Canadian Journal of Fisheries and Aquatic Sciences",
    issn = "1205-7533",
    number = "10",

    }

    Estimating delayed density-dependent mortality in sockeye salmon (oncorhynchus nerka): a meta-analytic approach. / Myers, Ransom A.; Bradford, Michael J.; Bridson, Jessica M.; Mertz, Gordon.

    In: Canadian Journal of Fisheries and Aquatic Sciences, Vol. 54, No. 10, 10.1997, p. 2449-2462.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Estimating delayed density-dependent mortality in sockeye salmon (oncorhynchus nerka): a meta-analytic approach

    AU - Myers, Ransom A.

    AU - Bradford, Michael J.

    AU - Bridson, Jessica M.

    AU - Mertz, Gordon

    N1 - Copyright NRC Canada 1997.

    PY - 1997/10

    Y1 - 1997/10

    N2 - Delayed density-dependent mortality can be a cause of the cyclic patterns in abundance observed in many populations of sockeye salmon (Oncorhynchus nerka). We used a meta-analytical approach to test for delayed density dependence using 34 time series of sockeye data. We found no consistent evidence for delayed density-dependent mortality using spawner - spring fry or spawner-recruit data. We did find evidence for delayed density-dependent mortality at a 1 year lag for the spawner - fall fry and the spawner-smolt data; however, effects at lags greater than 1 year were weak and not statistically significant. Between-cohort interactions at a 1-year lag are not sufficient to cause the observed cycles in adult abundance, although they will tend to reinforce patterns established by other mechanisms. Our results imply that reductions in fishing mortality in off-peak years should result in an increase in abundance.

    AB - Delayed density-dependent mortality can be a cause of the cyclic patterns in abundance observed in many populations of sockeye salmon (Oncorhynchus nerka). We used a meta-analytical approach to test for delayed density dependence using 34 time series of sockeye data. We found no consistent evidence for delayed density-dependent mortality using spawner - spring fry or spawner-recruit data. We did find evidence for delayed density-dependent mortality at a 1 year lag for the spawner - fall fry and the spawner-smolt data; however, effects at lags greater than 1 year were weak and not statistically significant. Between-cohort interactions at a 1-year lag are not sufficient to cause the observed cycles in adult abundance, although they will tend to reinforce patterns established by other mechanisms. Our results imply that reductions in fishing mortality in off-peak years should result in an increase in abundance.

    UR - http://pubs.nrc-cnrc.gc.ca/

    UR - http://www.stams.strath.ac.uk/~jessica/delayed_density_dependent_sockeye.pdf

    M3 - Article

    VL - 54

    SP - 2449

    EP - 2462

    JO - Canadian Journal of Fisheries and Aquatic Sciences

    T2 - Canadian Journal of Fisheries and Aquatic Sciences

    JF - Canadian Journal of Fisheries and Aquatic Sciences

    SN - 1205-7533

    IS - 10

    ER -