Abstract
The postglacial distribution of mallomonadacean scales is described from Upper Wallface Pond, a small, acidic lake in the High Peaks Region of the Adirondack Mountains. Similar to studies in other lake regions, Mallomonadaceae were present at only very low numbers during the pond's early postglacial history, but then populations developed rapidly about 11 000 B.P. The generalist Mallomonas crassisquama dominated the scale assemblage in all but the most recent sediments. Changes in species composition and abundance that occurred prior to this century can be related to events occurring in the pond's catchment, such as successions in terrestrial vegetation. The most striking changes in mallomonadacaean distributions occurred over the last 30 years, with the dominance of taxa tolerant of very acid (pH < 5.0) waters. The most likely cause for this recent decline in lakewater pH is acidic precipitation.
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