Abstract
The colonization of young raised-beach ridges and the subsequent development of lichen–heath vegetation is described for the Hudson Bay coastal tundra. The sequence of development of lichen–heath was quantified both on a coastal intraridge sequence as well as an interridge, inland sequence of comparable age. Corresponding gradients of elevation, soil peat thickness and organic matter were found along the developmental sequence, but definite trends in soil pH and available nutrients are absent. Superimposed upon the distributions of major species along the developmental sequence are marked changes in abundance over the beach-ridge profiles which reflect the adaptations of species to environmental factors related to ridge microtopography.
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