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THE EFFECTS OF AN EXPERIMENTAL INJECTION OF METHOXYCHLOR ON AQUATIC INVERTEBRATES: ACCUMULATION, STANDING CROP, AND DRIFT

Published online by Cambridge University Press:  31 May 2012

J. F. Flannagan ,
B. E. Townsend ,
B. G. E. de March ,
M. K. Friesen  and
S. L. Leonhard
J. F. Flannagan
Affiliation:
Freshwater Institute, Environment Canada, Winnipeg, Manitoba R3T 2N6
B. E. Townsend
Affiliation:
Freshwater Institute, Environment Canada, Winnipeg, Manitoba R3T 2N6
B. G. E. de March
Affiliation:
Freshwater Institute, Environment Canada, Winnipeg, Manitoba R3T 2N6
M. K. Friesen
Affiliation:
Freshwater Institute, Environment Canada, Winnipeg, Manitoba R3T 2N6
S. L. Leonhard
Affiliation:
Freshwater Institute, Environment Canada, Winnipeg, Manitoba R3T 2N6
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Abstract

A single 0.3 ppm injection of methoxychlor into the Athabasca River, Alberta on 4 June 1974 for 15 min caused catastrophic drift for a distance of over 400 km, and a subsequent large decrease in the drifting population. This decrease, when expressed as a percentage reduction from pretreatment drift, is in close agreement with percentage reduction of standing crop recorded by other sampling methods. The time required for the pesticide to affect different species varied considerably but was not related to the mode of feeding. Methoxychlor residues above ambient levels in water were recorded in all the invertebrate populations sampled. Caged animals had significantly different residues than the natural populations. The use of caged animals as indicators of environmental damage is therefore questioned.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 1 , January 1979 , pp. 73 - 89
Copyright
Copyright © Entomological Society of Canada 1979

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