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Free Content Ecological Structure in a West Indian Gorgonian Fauna

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This report summarizes observations of the species composition, distribution, and diurnal activity patterns of gorgonians on a West Indian patch reef under siltation stress. The study was conducted from an undersea habitat operated by the Puerto Rico Inter-National Undersea Laboratory. Fifteen species contribute significantly to the gorgonian fauna. Species diversity and equitability are high (H′ = 3.46 bits/individual; H′/H′max = 0.88), and the cumulative area-diversity curve rises rapidly. The gorgonians appear to interpret their environment as stable, favorable, and spatially uniform in spite of the siltation stress. Gorgonians show a daytime peak in polyp extension at 1000 hours and a nocturnal peak at 2200 hours. The daytime peak is strongly correlated with light intensity and plankton availability. The nocturnal peak is probably associated with feeding on zooplankton. Species specific differences in diurnal activity patterns suggest niche separation and that the degree of dependence on zooxanthellae may vary considerably. Predation on gorgonians appears to be slight but increases maintenance energy requirements and could influence the course of competition.

Document Type: Research Article

Publication date: April 1, 1975

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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