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The dynamics of architectural complexity on coral reefs under climate change.
Glob Chang Biol. 2015 Jan; 21(1):223-35.GC

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.

Authors+Show Affiliations

Marine Spatial Ecology Lab, ARC Centre of Excellence for Coral Reef Studies, School of Biological Sciences, University of Queensland, St. Lucia, Qld, 4072, Australia; College of Life Sciences, University of Exeter, Exeter, EX4 4PS, UK.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25099220

Citation

Bozec, Yves-Marie, et al. "The Dynamics of Architectural Complexity On Coral Reefs Under Climate Change." Global Change Biology, vol. 21, no. 1, 2015, pp. 223-35.
Bozec YM, Alvarez-Filip L, Mumby PJ. The dynamics of architectural complexity on coral reefs under climate change. Glob Chang Biol. 2015;21(1):223-35.
Bozec, Y. M., Alvarez-Filip, L., & Mumby, P. J. (2015). The dynamics of architectural complexity on coral reefs under climate change. Global Change Biology, 21(1), 223-35. https://doi.org/10.1111/gcb.12698
Bozec YM, Alvarez-Filip L, Mumby PJ. The Dynamics of Architectural Complexity On Coral Reefs Under Climate Change. Glob Chang Biol. 2015;21(1):223-35. PubMed PMID: 25099220.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The dynamics of architectural complexity on coral reefs under climate change. AU - Bozec,Yves-Marie, AU - Alvarez-Filip,Lorenzo, AU - Mumby,Peter J, Y1 - 2014/09/09/ PY - 2014/05/05/received PY - 2014/07/17/revised PY - 2014/07/25/accepted PY - 2014/8/8/entrez PY - 2014/8/8/pubmed PY - 2015/8/11/medline KW - bleaching and hurricanes KW - habitat loss KW - hindcast and forecast simulation KW - mechanical stress KW - parrotfish erosion KW - structural complexity SP - 223 EP - 35 JF - Global change biology JO - Glob Chang Biol VL - 21 IS - 1 N2 - 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. SN - 1365-2486 UR - https://www.unboundmedicine.com/medline/citation/25099220/The_dynamics_of_architectural_complexity_on_coral_reefs_under_climate_change_ L2 - https://doi.org/10.1111/gcb.12698 DB - PRIME DP - Unbound Medicine ER -