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An experimental study on the effects of grazing by parrotfishes and role of refuges in benthic community structure

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Abstract

In an experimental study on the effect of parrotfish (probably Scarus taeniurus) grazing on the structure of benthic reef communities, fishes in densities of 0.6 to 1.5 parrotfish per m2 or 9 to 17 g wet weight of fish per m2 of feeding surface were found to have an optimum effect, resulting in the greatest benthic species richness and biomass on 2-dimensional surfaces. The presence of refuges (3-dimensional habitats), however, has a greater impact on bemthic community structure (number of species and biomass) than does just the density of parrotfish in such an experimental system. Coral recruitment is enhanced by the presence of refuges and, like coralline algae, is more successful under increased grazing pressure. These optimum densities of parrotfishes relate well to observed field densities where, in a collection from a Hawaiian patch reef, there were 1.1 fish or 10.8 g wet weight of parrotfish per square meter of collection area. The success of coralline algae and corals under high grazing pressure may have important consequences for the stability and structure of modern coral reefs.

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Authors and Affiliations

  1. Hawaii Institute of Marine Biology, Kaneohe, Hawaii, USA

    R. E. Brock

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  1. R. E. Brock
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Communicated by N.D. Holland, La Jolla

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Brock, R.E. An experimental study on the effects of grazing by parrotfishes and role of refuges in benthic community structure. Mar. Biol. 51, 381–388 (1979). https://doi.org/10.1007/BF00389216

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