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LARVAL HABITAT CHARACTERISTICS OF COQUILLETTIDIA PERTURBANS (DIPTERA: CULICIDAE) IN MINNESOTA

Published online by Cambridge University Press:  31 May 2012

Darold P. Batzer  and
Robert D. Sjogren
Darold P. Batzer
Affiliation:
Metropolitan Mosquito Control District, 2380 Wycliff St., St. Paul, Minnesota, USA 55114
Robert D. Sjogren
Affiliation:
Metropolitan Mosquito Control District, 2380 Wycliff St., St. Paul, Minnesota, USA 55114
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Abstract

Larvae of Coquillettidia pertubans (Walker) are found in some marshes of permanent water with stands of aquatic vegetation. Eighty-six marshes, located within a 400-km2 area of Hennepin County, Minnesota, were examined in the fall of 1984 to determine factors that characterize C. perturbans breeding sites. We found that C. perturbans larvae attached to the roots of primarily Typha species although other plant species were also used. The water in sites with larvae was significantly deeper, lower in dissolved oxygen, and contained a significantly thicker layer of organic debris than sites without larvae. Larvae were associated with sites where Typha had specialized structures called water roots, which grow in the water column. Larvae inhabiting floating mats of vegetation were associated with interior openings within the mats.

Résumé

On trouve les larves de Coquillettidia perturbans (Walker) dans des marais permanents avec un couvert de végétation aquatique. A l’automne 1984, on a examiné 86 marais situés dans un secteur de 400 km2 du comté de Hennepin au Minnesota, afin de déterminer les caractéristiques des sites de multiplication de C. perturbans. On a trouvé que les larves de C. perturbans se fixent surtout sur les racines d’espèces de Typha, bien que d’autres espèces de plantes soient aussi utilisées. Dans les sites à larves, l’eau était significativement plus profonde, plus faible en oxygène dissout et avec une couche de débris organiques plus épaisse que dans les sites sans larves. Les larves étaient présentes dans les sites où les Typha avaient des structures spéciales désignées racines d’eau qui se développent dans la colonne d’eau. Les larves habitant les tapis de végétation flottante étaient associées aux ouvertures intérieures des tapis.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 11 , November 1986 , pp. 1193 - 1198
Copyright
Copyright © Entomological Society of Canada 1986

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