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Abstract
The absolute density distributions of 43 diatom taxa, representing combined relict and living populations resident in the upper 1 cm of sediment of a New England salt marsh, were assessed along a transect spanning the Spartina patens zone. Twenty-seven of the 43 taxa showed significant non-uniform density distributions; however, there was substantial variety in the number of modes, their placement and the variance in these distributions. The vertical density distributions in marsh sediments of taxa with non-uniform horizontal distributions across the marsh surface are expected to be a significant function of the taxon, marsh history and within-marsh locations of the cores.
