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Comparative Effects of Diquat plus Copper Sulfate on Aquatic Organisms

Published online by Cambridge University Press:  12 June 2017

B. E. May ,
R. S. Hestand  and
J. M. Van Dyke
B. E. May
Affiliation:
Florida Game and Fresh Water Fish Commission, Fisheries Res. Lab., Eustis, FL. 32726
R. S. Hestand
Affiliation:
Florida Game and Fresh Water Fish Commission, Fisheries Res. Lab., Eustis, FL. 32726
J. M. Van Dyke
Affiliation:
Florida Game and Fresh Water Fish Commission, Fisheries Res. Lab., Eustis, FL. 32726
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Abstract

Effects of herbicide combinations on aquatic invertebrates were evaluated in Inglis Reservoir, which is located in west coastal Florida. The addition of 6,7-dihydrodipyrido [1,2-a: 2′1′-c]pyrazinediium ion (diquat) plus the triethanolamine complex of copper sulfate (TAC) and diquat plus copper sulfate pentahydrate (CSP) for control of hydrilla (Hydrilla verticillata Casp.) decreased the number of invertebrates inhabiting the treated areas. The diquat plus CSP combination exerted the greatest effect upon invertebrate numbers. Both herbicide combinations, however, did alter significantly the number of taxonomic groups in the areas. Invertebrate declines were due more generally to resultant habitat changes (i.e., loss of hydrilla) than to direct herbicide toxicity. The response of fish to the effects of the herbicide treatments on invertebrates could be ascribed to dietary changes, decreased growth rates, and possible mortality.

Type
Research Article
Information
Weed Science , Volume 21 , Issue 3 , May 1973 , pp. 249 - 253
Copyright
Copyright © 1973 Weed Science Society of America 

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References

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