Chronic coral consumption by butterflyfishes |
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Authors: | A J Cole R J Lawton M S Pratchett S K Wilson |
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Institution: | (1) ARC Centre of Excellence for Coral Reef Studies, James Cook University, 4811 Townsville, Australia;(2) Marine Science Program, Department of Environment and Conservation, Kensington, WA, Australia |
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Abstract: | Interactions between predators and prey organisms are of fundamental importance to ecological communities. While the ecological
impact that grazing predators can have in terrestrial and temperate marine systems are well established, the importance of
coral grazers on tropical reefs has rarely been considered. In this study, we estimate the biomass of coral tissue consumed
by four prominent species of corallivorous butterflyfishes. Sub-adult butterflyfishes (60–70 mm, 6–11 g) remove between 0.6
and 0.9 g of live coral tissue per day, while larger adults (>110 mm, ~40–50 g) remove between 1.5 and 3 g of coral tissue
each day. These individual consumption rates correspond to the population of coral-feeding butterflyfishes at three exposed
reef crest habitats at Lizard Island, Great Barrier Reef, consuming between 14.6 g (±2.0) and 19.6 g (±3.9) .200 m−2 day−1 of coral tissue. When standardised to the biomass of butterflyfishes present, a combined reefwide removal rate of 4.2 g (±1.2)
of coral tissue is consumed per 200 m−2 kg−1 of coral-feeding butterflyfishes. The quantity of coral tissue removed by these predators is considerably larger than previously
expected and indicates that coral grazers are likely to play an important role in the transfer of energy fixed by corals to
higher consumers. Chronic coral consumption by butterflyfishes is expected to exact a large energetic cost upon prey corals
and contribute to an increased rate of coral loss on reefs already threatened by anthropogenic pressure and ongoing climate
change. |
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