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Scarid Biomass on the Northern Great Barrier Reef: The Influence of Exposure, Depth and Substrata

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Abstract

Here I investigate whether patterns of scarid biomass across the continental shelf of the northern Great Barrier Reef can be explained by species associating with particular characteristics of the reef environment. Despite the widely documented tendency of scarids to graze and browse over exposed calcareous reef surfaces, scarid biomass was not significantly correlated with the availability of feeding substrata for any species investigated. Indeed positive correlations between biomass and substrata variables were rare for the 18 species investigated, indicating that biomass in these taxa was not strongly reliant on the availability of preferred substrata quantified at the spatial scale of sites (1620 m2). Rather, species specific biomass was commonly highly variable between sites, suggesting that local aggregation of scarids commonly occurs at this scale. Such spatial patchiness potentially reflects the effects of spatially variable recruitment, fishes associating with unmeasured habitat characteristics or aggregating prior to spawning. Despite variability in the biomass of individual species between replicate sites within exposure regimes, exposure was generally a far more reliable predictor of biomass than the other variables quantified. This study provides little evidence to indicate that adult scarids have strict habitat requirements, rather they appear to be habitat generalists whose biomass is strongly influenced by exposure but weakly related to the cover of particular reef substratum.

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  1. Department of Marine Biology, James Cook University, Townsville, Queensland, 4811, Australia

    Nick Gust

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Gust, N. Scarid Biomass on the Northern Great Barrier Reef: The Influence of Exposure, Depth and Substrata. Environmental Biology of Fishes 64, 353–366 (2002). https://doi.org/10.1023/A:1016112312009

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