Abstract

Twelve species of seagrass were found in Shark Bay (26°S, 114°E), forming some of the largest seagrass meadows reported. The distribution of the species within the bay and descriptions of typical habitat types are given. The area is dominated by Amphibolis antarctica (Labill.) Sonder ex Aschers. which covers 3700 km 2, approximately 85% of the area covered by seagrasses, with smaller areas of Posidonia australis Hook. f. (200 km 2). Smaller seagrasses occupy an additional 500 km 2, which includes patches of high species richness, with up to 9 species within a few m 2. Factors influencing the distribution of seagrasses within Shark Bay are discussed.

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