Halimeda growth and diversity on the deep fore-reef of Enewetak Atoll |
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Authors: | Llewellya Hillis-Colinvaux |
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Institution: | (1) Department of Zoology, The Ohio State University, 43210 Columbus, Ohio, USA;(2) Present address: Farlow Herbarium, Harvard University, 20 Divinity Avenue, 02138 Cambridge, Massachusetts, USA |
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Abstract: | The deep fore-reef at Enewetak has been examined from the submersible Makali'i. Green algae grow to about-150 m at photon flux densities of approximately 1 Em-2s-1. Halimeda cover is 50% at many sites down to-90 m. Halimeda populations are important within the zone of scleractinian corals down to about-65 m, while a Halimeda zone with low coral cover or lacking corals between-65 m and-150 m probably is an important source of reef carbonate. Halimedas of the deep fore-reef, like those of the lagoon, constitute an important structural component in reef building. Other calcareous green algae such as Tydemania are less important on the deep fore-reef, but growth of coralline red algae continues to over-200m. Halimeda diversity is high down to near the base of the euphotic zone. |
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