Sediment suppresses herbivory across a coral reef depth gradient

Title
Sediment suppresses herbivory across a coral reef depth gradient
Publication Date
2012
Author(s)
Goatley, Christopher
( author )
OrcID: https://orcid.org/0000-0002-2930-5591
Email: cgoatley@une.edu.au
UNE Id une-id:cgoatley
Bellwood, David R
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
The Royal Society Publishing
Place of publication
United Kingdom
DOI
10.1098/rsbl.2012.0770
UNE publication id
une:20624
Abstract
Sediments are a ubiquitous feature of all coral reefs, yet our understanding of how they affect complex ecological processes on coral reefs is limited. Sediment in algal turfs has been shown to suppress herbivory by coral reef fishes on high-sediment, low-herbivory reef flats. Here, we investigate the role of sediment in suppressing herbivory across a depth gradient (reef base, crest and flat) by observing fish feeding following benthic sediment reductions. We found that sediment suppresses herbivory across all reef zones. Even slight reductions on the reef crest, which has 35 times less sediment than the reef flat, resulted in over 1800 more herbivore bites (h̄¹ m̄²). The Acanthuridae (surgeonfishes) were responsible for over 80 per cent of all bites observed, and on the reef crest and flat took over 1500 more bites (h̄¹ m̄²) when sediment load was reduced. These findings highlight the role of natural sediment loads in shaping coral reef herbivory and suggest that changes in benthic sediment loads could directly impair reef resilience.
Link
Citation
Biology Letters, 8(6), p. 1016-1018
ISSN
1744-957X
1744-9561
Start page
1016
End page
1018

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