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LABORATORY FLOW-THROUGH BIOASSAYS OF FOUR FORESTRY INSECTICIDES AGAINST STREAM INVERTEBRATES

Published online by Cambridge University Press:  31 May 2012

D.G. Poirier  and
G.A. Surgeoner
D.G. Poirier
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
G.A. Surgeoner
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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Abstract

Continuous-flow laboratory bioassays were used to assess the acute toxicities of four formulated insecticides to representative stream invertebrates. Toxicities (48-h LC50) ranged from 3.2 to 7.4 μg/L for permethrin, from 39 to 269 μg/L for fenitrothion, from 478 to 2863 μg/L for aminocarb, and from 99 to 492 μg/L for mexacarbate. Slopes of the probit lines were similar for acetylcholinesterase inhibitors (fenitrothion, aminocarb, and mexacarbate), but slightly lower for permethrin. All test species responded to all of the insecticides at concentrations of 0.25 μg/L for permethrin, 10 μg/L for fenithrothion, and 25 μg/L for aminocarb and mexacarbate by drifting in the test chambers.

Résumé

La toxicité aiguë de quatre formulations insecticides a été déterminée pour des invertébrés représentatifs du milieu lotique. Les tests ont été effectués en conditions de remplacement continu. Les toxicités observées, en terme de CL50 48 h, variaient entre 3,2 et 7,4 μg/L pour la permethrine, 39 et 269 μg/L pour le fénitrothion, 478 et 2863 μg/L pour l’aminocarbe et 99 et 492 μg/L pour le mexacarbate. Concernant les inhibiteurs de cholinesterases (fénitrothion, aminocarbe et mexacarbate), les pentes de régression probit étaient comparables, dans le cas de la permethrine, les pentes de régression étaient moins raides. Toutes les espèces étudiées ont été affectées, en terme de dérive, aux concentrations de 0,25 μg/L de permethrine, 10 μg/L fénitrothion et 25 μg/L aminocarbe et mexacarbate.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 9 , September 1987 , pp. 755 - 763
Copyright
Copyright © Entomological Society of Canada 1987

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