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CHIRONOMIDAE (DIPTERA) OF PEATLANDS AND MARSHES IN CANADA

Published online by Cambridge University Press:  31 May 2012

Dale A. Wrubleski
Dale A. Wrubleski*
Affiliation:
Delta Waterfowl and Wetlands Research Station, R.R. 1, Portage la Prairie, Manitoba, Canada R1N 341
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Abstract

A survey of the literature has revealed that the Chironomidae are one of the most abundant and diverse groups of insects present in Canadian peatlands and marshes. A total of 104 named species of Chironomidae has been recorded from Canadian bogs, fens, and marshes. At least 207 species are present if all unnamed species are included in the total. However, until more information is available about the distribution of chironomid species, particularly those from fens, it is not possible to determine if any species (other than Metriocnemus knabi Coq.) are restricted to these habitats. Although several studies have been conducted in marshes and bog pools, the saturated peat habitats of fens and bogs have been little studied.

Most information on chironomids within peatlands and marshes is based on emergence trapping of adults, and there have been few attempts to study the ecologically important immature stages. Several aspects of chironomid ecology pertinent to peatlands and marshes are presented, based primarily on information gathered from other shallow-water habitats. The ecological and economic importance of chironomids within these habitats remains largely unknown. Most effort to date has been expended on faunal surveys, and any attempt to study chironomid ecology within peatlands and marshes would add greatly to existing knowledge.

Résumé

Une revue de la littérature révèle que les Chironomidae sont l'un des groupes d'insectes les plus abondants et diversifiés des tourbières et des marécages du Canada. On a rapporté un total de 104 espèces identifiées de Chironomidae pour les tourbières ombrotrophes et minérotrophes et les marécages du Canada. Il y aurait au moins 207 espèces si l'on ajoute les espèces n'ayant pas encore reçu de nom. Cependant, jusqu'à ce qu'on ait davantage d'information sur la répartition des espèces, surtout celles des marécages, il n'est pas possible de préciser si certaines (à l'exception de Metriocnemus knabi Coq.) sont limitées à un habitat en particulier. Bien que plusieurs études aient été effectuées dans les marécages et les mares faisant partie des tourbières, les habitats tourbeux saturés des tourbières ombrotrophes et minérotrophes ont reçu bien peu d'attention.La majorité des connaissances sur les chironomides des tourbières et des marécages reposent sur le piégeage d'adultes en émergence car peu d'études ont porté sur les formes immatures malgré leur importance écologique. On aborde plusieurs aspects de l'écologie des chironomides qui sont pertinents aux tourbières et aux marécages, en s'appuyant surtout sur les connaissances provenant d'autres habitats d'eau peu profonde. L'importance écologique et économique des ehironomides de ces habitats demeure à peu près inconnue. Les efforts ont jusqu'à maintenant surtout porté sur des inventaires faunistiques. Toute étude éventuelle de l'écologie des chironomides des tourbières et des marécages ajoutera grandement aux connaissances actuelles.

Type
Research Article
Information
The Memoirs of the Entomological Society of Canada , Volume 119 , Supplement S140 , 1987 , pp. 141 - 161
Copyright
Copyright © Entomological Society of Canada 1987

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Footnotes

1

Paper number 20 of the Marsh Ecology Research Program, Delta Waterfowl and Wetlands Research Station and Ducks Unlimited Canada.

2

Present address: Department of Entomology, University of Alberta, Edmonton, Alberta, Canada T6G 2E3.

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