Abstract
The sublittoral zonation of macroalgae and abundant animals in Potter Cove, King George Island, is described in relation to substrate, exposure to turbulence and impact of grounding icebergs. Implications on the ecological niches of the most prominent phaeophytes are discussed. It is concluded that Desmarestia anceps and D. menziesii exclude Himantothallus grandifolius under favourable conditions. However, Himantothallus, by its potential to inhabit unstable substrates, may be better adapted to withstand the ice impact. The replacement of Desmarestia by Himantothallus at greater depth can be explained only partially at present.
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