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A COMPARISON OF THE SPRING-INHABITING GENERA OF CHIRONOMIDAE FROM THE HOLARCTIC WITH THOSE FROM NATURAL AND MANMADE SPRINGS IN LABRADOR, CANADA

Published online by Cambridge University Press:  31 May 2012

M.H. Colbo*
Affiliation:
Department of Biology, Memorial University, St. John's, Newfoundland, Canada A1B 3X9
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Abstract

From the literature 70 of the 212 chironomid genera known in the immature stage from the Holarctic Region are considered in this paper to be inhabitants of springs or seeps, or both. Three more are known only from adults collected at springs and seeps so that 73 out of 235 genera recognized from the Holarctic appear to be associated with these habitats. Literature records of distribution suggest that 65 of the 73 occur in northeastern North America. Collections from natural and manmade springs and seeps in Labrador yielded 45 genera; 40 of these genera belong to the set of 65 genera noted above. The other five are likely spill-overs into springs and seeps from adjacent habitats. Communities from manmade springs and seeps originating from the earth dykes and dams at Churchill Falls were compared with natural springs and seeps there and in Goose Bay, Labrador. Chironomid communities were similar at the generic level in both man-made and natural spring–seep habitats.

Résumé

Selon la littérature, 70 des 212 genres de chironomide connus au stade immature de la région holarctique sont considéré, dans le présent article, être habitants des sources ou des fuites ou des deux. Trois autres ne sont connus qu'à partir des insectes adultes collectionnés aux sources et aux fuites; ainsi, 73 des 235 genres connus de la région holarctique semblent être associés avec ces habitats. Les données de distribution dans la littérature proposent que 65 de ces 73 se trouvent en Amérique du nord. Les collections faites à partir des sources et des fuites faites par l'homme au Labrador ont consisté de 45 genres; 40 de ces genres appartiennent à l'ensemble de 65 genres mentionnés ci-dessus. Les cinq autres genres ne sont pas associés à ces habitats et proviennent probablement d'habitats voisinants. Les communautés des sources et des fuites faites par l'homme originant des digues terrestres et des barrages à Churchill Falls, ont été comparées avec les sources et les fuites naturelles à cet endroit et à Goose Bay, Labrador. Au niveau du genre, les communautés de chironomides étaient semblables entre les habitats de sources et de fuites d'origine naturelle et ceux faits par l'homme.

Type
Research Article
Copyright
Copyright © Entomological Society of Canada 1991

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