The impact of supplementation in winter-run chinook salmon on effective population size

Phil W. Hedrick, D. Hedgecock, S. Hamelberg, S. J. Croci

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Supplementation of young raised at a protected site, such as a hatchery, may influence the effective population size of an endangered species. A supplementation program for the endangered winter-run chinook salmon from the Sacramento River, California, has been releasing fish since 1991. A breeding protocol, instituted in 1992, seeks to maximize the effective population size from the captive spawners by equaling their contributions to the released progeny. As a results the releases in 1994 and 1995 appear not to have decreased the overall effective population size and may have increased it somewhat. However, mistaken use of non-winter-run chinook spawners resulted in artificial crosses between runs with a potential reduction in effective population size, and imprinting of the released fish on Battle Creek, the site of the hatchery, resulted in limiting the contribution of the released fish to the target mainstem population. Rapid genetic analysis of captured spawners and a new rearing facility on the Sacramento River should alleviate these problems and their negative effect on the effective population size in future years.

Original languageEnglish (US)
Pages (from-to)112-116
Number of pages5
JournalJournal of Heredity
Volume91
Issue number2
StatePublished - Mar 2000

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Salmon
Oncorhynchus tshawytscha
Population Density
population size
winter
Sacramento River
Fishes
Rivers
hatcheries
fish
Endangered Species
genomic imprinting
Health Services Needs and Demand
endangered species
Breeding
genetic techniques and protocols
rearing
breeding

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Genetics
  • Genetics(clinical)

Cite this

Hedrick, P. W., Hedgecock, D., Hamelberg, S., & Croci, S. J. (2000). The impact of supplementation in winter-run chinook salmon on effective population size. Journal of Heredity, 91(2), 112-116.

The impact of supplementation in winter-run chinook salmon on effective population size. / Hedrick, Phil W.; Hedgecock, D.; Hamelberg, S.; Croci, S. J.

In: Journal of Heredity, Vol. 91, No. 2, 03.2000, p. 112-116.

Research output: Contribution to journalArticle

Hedrick, PW, Hedgecock, D, Hamelberg, S & Croci, SJ 2000, 'The impact of supplementation in winter-run chinook salmon on effective population size', Journal of Heredity, vol. 91, no. 2, pp. 112-116.
Hedrick PW, Hedgecock D, Hamelberg S, Croci SJ. The impact of supplementation in winter-run chinook salmon on effective population size. Journal of Heredity. 2000 Mar;91(2):112-116.
Hedrick, Phil W. ; Hedgecock, D. ; Hamelberg, S. ; Croci, S. J. / The impact of supplementation in winter-run chinook salmon on effective population size. In: Journal of Heredity. 2000 ; Vol. 91, No. 2. pp. 112-116.
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