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LATE-QUATERNARY FOSSIL CHIRONOMIDAE (DIPTERA) FROM HIPPA LAKE, QUEEN CHARLOTTE ISLANDS, BRITISH COLUMBIA, WITH SPECIAL REFERENCE TO CORYNOCERA ZETT.

Published online by Cambridge University Press:  31 May 2012

Ian R. Walker  and
Rolf W. Mathewes
Ian R. Walker
Affiliation:
Department of Biological Sciences, and Institute for Quaternary Research, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
Rolf W. Mathewes
Affiliation:
Department of Biological Sciences, and Institute for Quaternary Research, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
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Abstract

Chironomid stratigraphic analyses of sediment from Hippa Lake, Queen Charlotte Islands, B.C., revealed a fossil chironomid record unlike that reported for deeper lakes of southwestern British Columbia, but similar to an arctic Alaskan sequence. Little evidence of trophic succession or climatic change was noted.

Chironomids, including Corynocera nr. ambigua Zett., rapidly colonized the lake. Because the known adults of Corynocera Zett. are brachypterous, the early arrival of C. nr. ambigua at Hippa Lake suggested either that this species survived in a Queen Charlotte glacial refugium, that chironomids can disperse very rapidly, even without active flight, or the existence of a previously undescribed Corynocera species with well-developed wings.

Elsewhere, fossils of the C. ambigua group are commonly associated with fossil oospores of Chara Valliant and Nitella Agardh. North American records are inconsistent, although similar correlations existed in some coastal lakes of British Columbia.

Résumé

Des analyses stratigraphiques des sédiments du lac Hippa des Iles de la Reine Charlotte, C.-B., ont révélé une faune chironomide fossile différente de celles rapportées dans des lacs plus profonds du sud-ouest de la Colombie Britannique, et similaire à une séquence de provenance arctique en Alaska. On a découvert peu d’évidence de succession trophique ou de changement climatique.

Des chironomides y compris Corynocera proche d’ambigua Zett. ont rapidement colonisé le lac. Etant donné que les adultes connus de Corynocera Zett. sont brachyptères, l’arrivée hâtive de C. proche d’ambigua au lac Hippa indique que cette espèce a survécu dans un refugium glaciaire des Iles, ou que les chironomides peuvent se disperser très rapidement et ce même sans l’assistance du vol, ou encore l’existence d’une espèce de Corynocera non décrite avec des ailes pleinement développées.

Ailleurs, les fossiles du groupe C. ambigua sont communément associés aux oospores fossiles de Chara Vallianl et Nitella Agardh. Les mentions nord-américaines sont incohérentes, mais des corrélations similaires existaient dans certains lacs côtiers de la Colombie Britannique.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 8-9 , September 1988 , pp. 739 - 751
Copyright
Copyright © Entomological Society of Canada 1988

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