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Benthic Macroalgae of Shark Bay, Western Australia

One hundred and sixty one taxa of benthic macro-algae are reported from Shark Bay, Western Australia, growing either on subtidal rock platforms, on the extensive sandflats that dominate the bay, or as epiphytes on seagrasses and other algae. In addition many species survive as drift algae amongst the seagrass beds. Tropical taxa predominate. The Rhodophyta are represented by the greatest number of taxa, but these tend to be inconspicuous epiphytes. Members of the Chlorophyta are the most conspicuous in most areas, with Penicillus nodulosus and Polyphysa peniculus the most common species. Polyphysa peniculus dominates the high salinity areas south of the Faure Sill. The brown algae Hormophysa cuneiformis and Dictyota furcellata were also common in high salinity areas. Benthic algal species richness was lower in areas of high salinity.