Postglacial Vegetation on Adak Island, Aleutian Islands, Alaska

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Abstract
Thirty stratigraphic samples from a 2.75 m section of sedge peat located on northern Adak were studied for their pollen and spore content. The section is approximately 10,250 radiocarbon yr in age and contains numerous volcanic ash horizons. Three major pollen assemblages indicative of the postglacial vegetation sequence are: Cyperaceae-Salix-Empetrum-Lycopodium in the beginning, Cyperaceae and Gramineae between about 10,000 and 3000 years ago; and subsequently Empetrum. Climate, cold and windy during the early and late postglacial and warmer midway, is interpreted to be primarily responsible for the vegetation changes. The effect of ashfalls on the vegetation appears to be only transitory.

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