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.