Exposure to high temperature influences the behaviour, physiology, and survival of sockeye salmon during spawning migration

G. T. Crossin, S. G. Hinch, S. J. Cooke, D. W. Welch, D. A. Patterson, S. R.M. Jones, A. G. Lotto, R. A. Leggatt, M. T. Mathes, J. M. Shrimpton, G. Van Der Kraak, A. P. Farrell

Résultat de recherche: Articleexamen par les pairs

185 Citations (Scopus)

Résumé

Since 1996, some populations of Fraser River sockeye salmon (Oncorhynchus nerka Walbaum in Artedi, 1792) have begun spawning migrations weeks earlier than normal, and most perish en route as a result. We suspect that a high midsummer river temperature is the principal cause of mortality. We intercepted 100 sockeye during normal migration near a spawning stream and measured somatic energy and aspects of plasma biochemistry. Fish were then held at either 10 or 18 °C for 24 days. Before release, fish were biopsied again and implanted with acoustic transmitters. A group of biopsied but untreated control salmon were released at the same time. Sixty-two percent (8 of 13) of control salmon and 68% (21 of 31) of 10 °C salmon reached spawning areas. The 18 °C-treated fish were half as successful (35%; 6 of 17). During the holding period, mortality was 2 times higher and levels of Parvicapsula minibicornis (Kent, Whitaker and Dawe, 1997) infection were higher in the 18 °C-treated group than in the 10 °C-treated group. The only physiological difference between treatments was a change in gill Na+,K+-ATPase activity. This drop correlated negatively with travel times for the 18 °C-treated males. Reproductive-hormone levels and stress measures did not differ between treatments but showed significant correlations with individual travel times.

Langue d'origineEnglish
Pages (de-à)127-140
Nombre de pages14
JournalCanadian Journal of Zoology
Volume86
Numéro de publication2
DOI
Statut de publicationPublished - févr. 2008
Publié à l'externeOui

ASJC Scopus Subject Areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

Empreinte numérique

Plonger dans les sujets de recherche 'Exposure to high temperature influences the behaviour, physiology, and survival of sockeye salmon during spawning migration'. Ensemble, ils forment une empreinte numérique unique.

Citer