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

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Science  30 Aug 1991:
Vol. 253, Issue 5023, pp. 1010-1012
DOI: 10.1126/science.253.5023.1010


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.