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Last modified
7/14/2009 5:02:31 PM
Creation date
5/22/2009 7:28:49 PM
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UCREFRP
UCREFRP Catalog Number
7759
Author
Beyers, D. W. and M. S. Farmer.
Title
Effects of Copper and Zinc on Olfaction of Colorado Squawfish as Estimated by Behavioral Assay.
USFW Year
1994.
USFW - Doc Type
\
Copyright Material
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arbitrarily selected as a conservative threshold for adverse <br />effects. <br />Results <br />Toxicant Solutions <br />Chemical analysis confirmed accuracy of exposure <br />concentrations. Measured copper and zinc concentrations averaged <br />92% (SE = 4.8) and 84% (SE = 0.50) of nominal, respectively. <br />Because measured and nominal concentrations were in close <br />agreement, statistical analyses were based on nominal <br />concentrations. <br />Behavioral Assay <br />Logistic regression showed that olfactory inhibition <br />increased as a function of toxicant concentration after 24-h <br />exposure to copper and zinc, and 96-h exposure to copper, but not <br />after 96-h exposure to zinc (Table 2). The EC50s and 95% <br />confidence limits (in parentheses) were 36.1 (22.6, 57.9) µg/L <br />copper and 1640 (805, 3360) µg/L zinc for 24-h exposures, and <br />59.0 (40.2, 86.5) µg/L copper for 96-h exposure. The ECls were <br />0.888 (0.155, 5.12) µg/L copper and 135 (16.1, 1150) µg/L <br />zinc for 24-h exposures, and 15 (5.69, 43.6) µg/L copper for 96-h <br />exposure. These results suggest that copper is a more potent <br />olfactory toxicant than zinc. They also suggest that both <br />toxicants had greater inhibitory effects after 24-h exposure than <br />10 <br />
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