Abstract Communities of seagrasses (Thalassia testudinwn Banks ex König and Syringodium filiforme Kütz. in Hohenacker) and rhizophytic algae (Halimeda incrassata (Ellis) Lamour., Penicillus capitatus Lamarck and Udotea flabellum (Ellis et Sol.) Lamour.) were sampled quantitatively from two sites in Bermuda. An intermixture of Thalassia and Syringodium occurs in the more exposed, sandy site, Whalebone Bay, whereas there is a sharp zonation of Thalassia (upper) and Syringodium (lower) in the more sheltered, soft-bottomed site, Ferry Reach. Thalassia was significantly more numerous (mean 903 shoots m~ 2 ) at Whalebone Bay compared with Ferry Reach (mean 394 shoots m~2), although plants were larger at Ferry Reach than at Whalebone Bay and the estimated Standing crop was not significantly different between the two sites. Halimeda incrassata and Penicillus capitatus were important in both beds, but Udotea flabellum was sparsely distributed. The rhizophytic algae were more abundant at Ferry Reach than at Whalebone Bay, and there was an inverse relationship between depth and number of Halimeda plants. In mixed Stands of Thalassia and Syringodium there was a tendency for exclusion of the rhizophytic algae, and in the pure stand of Syringodium at Ferry Reach, rhizophytic algae were absent. Introduction Lying in the
Botanica Marina – de Gruyter
Published: Jan 1, 1983
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