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Effects of Acute Temperature Change on Respiration and Toxicant Uptake by Rainbow Trout, Salmo gairdneri (Richardson)

Marsha C. Black, Deborah S. Millsap and John F. McCarthy
Physiological Zoology
Vol. 64, No. 1 (Jan. - Feb., 1991), pp. 145-168
Stable URL: http://www.jstor.org/stable/30158517
Page Count: 24
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Acute Temperature Change on Respiration and Toxicant Uptake by Rainbow Trout, Salmo gairdneri (Richardson)
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Abstract

The effects of an acute reduction in temperature (from 17° to 8° C) on respiration and the uptake of benzo[a]pyrene, 2,2′,5,5′-tetrachlorobiphenyl, and naphthalene by the gills of rainbow trout (Salmo gairdneri Richardson) were investigated with a fish metabolic chamber. As the temperature was lowered, decreased respiratory functions coupled with decreased O₂ and toxicant uptake efficiencies resulted in reduced O₂ consumption and toxicant uptake. Changes in trout respiration had no consistent effect on either O₂ or toxicant uptake efficiencies. Linear correlations were observed between O₂ and toxicant uptake eficiencies and between O₂ consumption and toxicant uptake. The reductions in O₂ and toxicant uptake are attributed to the combined effects of temperature change on gill membrane permeability and on trout O₂ demand. A framework for predicting changes in toxicant uptake on the basis of changes in O₂ consumption is proposed based on quantitative relationships observed between O₂ and toxicant uptake.

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