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Science 30 August 1991:
Vol. 253. no. 5023, pp. 1010 - 1012
DOI: 10.1126/science.253.5023.1010
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Articles

Allerød—Younger Dryas Lake Temperatures from Midge Fossils in Atlantic Canada

IAN R. WALKER 1, ROBERT J. MOTT 2, and JOHN P. SMOL 1

1 Department of Biology, Queen's University, Kingston, Ontario, Canada K7L 3N6
2 Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada K1A 0E8

Correspondence should be addressed at Department of Biology, Okanagon College, 1000 K.L.O. Road, Kelowna, British Columbia, Canada V1Y 4X8

Remains of freshwater midges are abundant in lake sediments, and their species distributions are closely related to the surface-water temperature of lakes; their distributions thus provide a powerful tool for paleoclimatology. The distribution of species in a core from Splan Pond in Atlantic Canada indicates that there were abrupt transitions in late-glacial temperatures between warm and cold states. The transitions are correlative with the well-known warm Allerød and cold Younger Dryas events in Europe. These data thus confirm the inference from palynological data that these events affected regions on both sides of the Atlantic.

Submitted on February 20, 1991
Accepted on June 4, 1991


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Science. ISSN 0036-8075 (print), 1095-9203 (online)