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Suppression of herbivory by macroalgal density: a critical feedback on coral reefs?
Author(s) -
Hoey Andrew S.,
Bellwood David R.
Publication year - 2011
Publication title -
ecology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.852
H-Index - 265
eISSN - 1461-0248
pISSN - 1461-023X
DOI - 10.1111/j.1461-0248.2010.01581.x
Subject(s) - coral reef , reef , ecology , resilience of coral reefs , herbivore , environmental issues with coral reefs , coral , dominance (genetics) , sargassum , habitat , aquaculture of coral , biology , parrotfish , algae , biochemistry , gene
Ecology Letters (2011) 14: 267–273 Abstract Coral reefs globally are in decline, with some reefs undergoing phase shifts from coral‐dominance to degraded states dominated by large fleshy macroalgae. These shifts have been underpinned by the overharvesting of herbivorous fishes and represent a fundamental change in the physical structure of these reefs. Although the physical structure provided by corals is regarded as a key feature that facilitates herbivore activity, the influence of the physical structure of macroalgal stands is largely unknown. Using transplanted Sargassum , the largest coral reef macroalga, we created habitat patches of predetermined macroalgal density (0.25–6.23 kg m −2 ). Remote video cameras revealed both grazing and browsing fishes avoided high density patches, preferring relatively open areas with low macroalgal cover. This behaviour may provide a positive feedback leading to the growth and persistence of macroalgal stands; increasing the stability of phase shifts to macroalgae.