Abstract
Abstract Pollen analysis of sediments from Small Momela Lake indicates that grass savanna or thicket savanna covered the surrounding Mt. Ujamaa (Mt. Meru) Lahar in northern Tanzania from about 6000 to 1700 yr B.P. and since 600 yr B.P. The interval from 1700 to 600 yr B.P. is marked by peaks in the percentages of Olea and Justicia pollen and a drop in the percentage of grass pollen. At this same time changes in the diatom assemblage (Hecky, 1971) suggest a freshening of the lake while radiocarbon dates indicate an increase in the sediment accumulation rate. The changes in the pollen record for the last 1700 years may indicate disturbance of the vegetation, perhaps by humans, but this interpretation must be viewed with caution. This study illustrates the difficulties in inferring ecological or anthropological changes from pollen data in regions dominated by grassland vegetation.
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