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DRIFT OF AQUATIC INSECTS FOLLOWING METHOXYCHLOR TREATMENT OF THE SASKATCHEWAN RIVER SYSTEM

Published online by Cambridge University Press:  31 May 2012

Lloyd M. Dosdall  and
Dennis M. Lehmkuhl
Lloyd M. Dosdall
Affiliation:
Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0
Dennis M. Lehmkuhl
Affiliation:
Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0
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Abstract

Drift of aquatic insects was compared at three sites downstream (21, 38, and 107 km) from methoxychlor treatment (0.3 mg. L−1 for 15 min) of the North Saskatchewan River, relative to an upstream untreated site. Species of Diptera (Simuliidae), Ephemeroptera (Baetidae, Heptageniidae, Ephemerellidae, Ametropodidae, Metretopodidae, and Tricorythidae), Plecoptera (Perlodidae and Chloroperlidae), Trichoptera (Hydropsychidae and Hydroptilidae), and Hemiptera (Corixidae) were studied. Drift responses differed depending on species, distance from the injection site, and time after methoxychlor injection. Exposure to methoxychlor initiated catastrophic drift of aquatic insects at all downstream sites. Of 22 species compared before treatment and following methoxychlor injection, post-treatment drift of 17, 21, and 13 species significantly exceeded pre-treatment drift at the km 21, 38, and 107 sites, respectively. Methoxychlor treatment initiated or increased drift of several normally non-drifting species. Similar drift patterns were observed among closely related taxa during the catastrophic phase. For all species studied, comparisons of 24-h drift densities between days preceding and following the catastrophic phase of treatment indicated significant post-treatment drift density increases or decreases at one or more of the downstream sites, but not at the untreated site. Species were classified according to their drift responses to methoxychlor treatment. Factors that may have caused different drift responses among species are discussed.

Résumé

On a comparé la dérive d’insectes aquatiques à trois sites en aval du site d’application (21, 38 et 107 km) d’un traitement au methoxychlor (0,3 mg. L−1 pendant 15 min) dans la rivière North Saskatchewan, à celle d’un site témoin situé en amont. On a étudié des espèces de Diptera (Simuliidae), d’Ephemeroptera (Baetidae, Heptageniidae, Ephemerellidae, Ametropodidae, Metretopodidae et Tricorythidae), de Plecoptera (Perlodidae et Chloroperlidae), de Trichoptera (Hydropsychidae et Hydroptilidae) et d’Hemiptera (Corixidae). La dérive a varié dépendant de l’espèce, de la distance par rapport au site traité et du temps après le traitement. Le traitement au méthoxychlor a provoqué une dérive catastrophique des insectes aquatiques à tous les sites situés en aval. Parmi 22 espèces suivies avant et après le traitement, la dérive post-traitement excédait la dérive pré-traitement pour 17, 21 et 13 espèces, aux km 21, 38 et 107, respectivement. Le traitement a déclenché ou augmenté la dérive de plusieurs espèces qui, normalement, ne dérivent que peu ou pas. Dans patrons de dérive similaires ont été observés chez des taxons étroitement apparentés durant la phase catastrophique. Pour toutes les espèces étudiées, la comparaison de la densité de dérive pendant 24 h entre des jours précédant et suivant la phase catastrophique a indiqué une augmentation ou une diminution significative de la densité de dérive à un ou plusieurs des sites situés en aval, mais pas au site témoin. Les espèces ont pu être classifiées selon leur réaction de dérive au traitement. On discute des facteurs pouvant expliquer la réaction différentielle de dérive des espèces.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 12 , December 1989 , pp. 1077 - 1096
Copyright
Copyright © Entomological Society of Canada 1989

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