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Effects of hypoxia on scope-for-activity and power capacity of lake trout (Salvelinus namaycush)

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Abstract:

This study develops a quantitative model of the combined effects of temperature and ambient dissolved oxygen on metabolic scope-for-activity and power capacity of juvenile lake trout (Salvelinus namaycush). The model provides a framework for evaluating the effects of hypoxia on the capacity of lake trout to perform critical daily life support activities. Maximum power output for sustained swimming of yearling lake trout occurred at 12–20 °C and a dissolved oxygen concentration of >7 mg·L–1. At 4–8 °C, temperatures typical of the hypolimnetic summer habitat of juvenile lake trout, maximum power capacity was reduced by 33%, 67%, and 100% at ambient dissolved oxygen concentrations of 7, 5, and 3 mg·L–1, respectively. Analysis of power outputs, growth impairment, and recruitment success indicated that attainment of 3/4 power capacity would accommodate most daily life support activities of juvenile lake trout. At 4–14 °C, the threshold dissolved oxygen concentration for attainment of 3/4 scope-for-activity varied from 7.5 to 6.6 mg·L–1, respectively, with a mean and standard deviation of 7.04 ± 0.33 mg·L–1. A dissolved oxygen criterion of 7 mg·L–1 is recommended for protection of the hypolimnetic habitat of juvenile lake trout.

On trouvera ici un modèle quantitatif des effets combinés de la température et de l'oxygène dissous du milieu sur le profil métabolique et le potentiel de puissance des jeunes touladis (Salvelinus namaycush). Le modèle fournit un cadre pour évaluer les effets de l'hypoxie sur la capacité des touladis de remplir les activités quotidiennes essentielles à leur survie. La puissance maximale pour la nage soutenue de jeunes touladis d'un an est produite à 12–20 °C et à une concentation d'oxygène dissous de >7 mg·L–1. À 4–8 °C, des températures typiques de l'habitat d'été des jeunes touladis dans l'hypolimnion, le potentiel maximum de puissance est réduit de 33 %, 67 % et 100 % aux concentrations respectives d'oxygène dissous du milieu de 7, 5 et 3 mg·L–1. L'analyse des puissances produites, de la réduction de la croissance et du succès du recrutement indique que l'atteinte de 3/4 du potentiel de puissance suffit pour permettre la plupart des activités essentielles à la survie chez les jeunes touladis. À 4–14 °C, le seuil de la concentration d'oxygène dissous qui permet d'atteindre les 3/4 du profil métabolique varie de 7,5 à 6,6 mg·L–1, avec une moyenne et un écart type de 7,04 ± 0,33 mg·L–1. Le seuil recommandé de 7 mg·L–1 assurerait la protection de l'habitat hypolimnétique des jeunes touladis.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2007

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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