The dynamics of architectural complexity on coral reefs under climate change

Bozec, Yves-Marie, Alvarez-Filip, Lorenzo and Mumby, Peter J. (2015) The dynamics of architectural complexity on coral reefs under climate change. Global Change Biology, 21 1: 223-235. doi:10.1111/gcb.12698


Author Bozec, Yves-Marie
Alvarez-Filip, Lorenzo
Mumby, Peter J.
Title The dynamics of architectural complexity on coral reefs under climate change
Journal name Global Change Biology   Check publisher's open access policy
ISSN 1365-2486
1354-1013
Publication date 2015-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1111/gcb.12698
Volume 21
Issue 1
Start page 223
End page 235
Total pages 13
Place of publication Chichester, West Sussex, United Kingdom
Publisher Blackwell Publishing
Collection year 2015
Language eng
Abstract One striking feature of coral reef ecosystems is the complex benthic architecture which supports diverse and abundant fauna, particularly of reef fish. Reef-building corals are in decline worldwide, with a corresponding loss of live coral cover resulting in a loss of architectural complexity. Understanding the dynamics of the reef architecture is therefore important to envision the ability of corals to maintain functional habitats in an era of climate change. Here, we develop a mechanistic model of reef topographical complexity for contemporary Caribbean reefs. The model describes the dynamics of corals and other benthic taxa under climate-driven disturbances (hurricanes and coral bleaching). Corals have a simplified shape with explicit diameter and height, allowing species-specific calculation of their colony surface and volume. Growth and the mechanical (hurricanes) and biological erosion (parrotfish) of carbonate skeletons are important in driving the pace of extension/reduction in the upper reef surface, the net outcome being quantified by a simple surface roughness index (reef rugosity). The model accurately simulated the decadal changes of coral cover observed in Cozumel (Mexico) between 1984 and 2008, and provided a realistic hindcast of coral colony-scale (1-10 m) changing rugosity over the same period. We then projected future changes of Caribbean reef rugosity in response to global warming. Under severe and frequent thermal stress, the model predicted a dramatic loss of rugosity over the next two or three decades. Critically, reefs with managed parrotfish populations were able to delay the general loss of architectural complexity, as the benefits of grazing in maintaining living coral outweighed the bioerosion of dead coral skeletons. Overall, this model provides the first explicit projections of reef rugosity in a warming climate, and highlights the need of combining local (protecting and restoring high grazing) to global (mitigation of greenhouse gas emissions) interventions for the persistence of functional reef habitats.
Keyword Bleaching and hurricanes
Habitat loss
Hindcast and forecast simulation
Mechanical stress
Parrotfish erosion
Structural complexity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biological Sciences Publications
 
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