Coral Reefs

, Volume 30, Issue 2, pp 485–495

Predicting outbreaks of a climate-driven coral disease in the Great Barrier Reef

  • J. A. Maynard
  • K. R. N. Anthony
  • C. D. Harvell
  • M. A. Burgman
  • R. Beeden
  • H. Sweatman
  • S. F. Heron
  • J. B. Lamb
  • B. L. Willis
Report

Abstract

Links between anomalously high sea temperatures and outbreaks of coral diseases known as White Syndromes (WS) represent a threat to Indo-Pacific reefs that is expected to escalate in a changing climate. Further advances in understanding disease aetiologies, determining the relative importance of potential risk factors for outbreaks and in trialing management actions are hampered by not knowing where or when outbreaks will occur. Here, we develop a tool to target research and monitoring of WS outbreaks in the Great Barrier Reef (GBR). The tool is based on an empirical regression model and takes the form of user-friendly interactive ~1.5-km resolution maps. The maps denote locations where long-term monitoring suggests that coral cover exceeds 26% and summer temperature stress (measured by a temperature metric termed the mean positive summer anomaly) is equal to or exceeds that experienced at sites in 2002 where the only severe WS outbreaks documented on the GBR to date were observed. No WS outbreaks were subsequently documented at 45 routinely surveyed sites from 2003 to 2008, and model hindcasts for this period indicate that outbreak likelihood was never high. In 2009, the model indicated that outbreak likelihood was high at north-central GBR sites. The results of the regression model and targeted surveys in 2009 revealed that the threshold host density for an outbreak decreases as thermal stress increases, suggesting that bleaching could be a more important precursor to WS outbreaks than previously anticipated, given that bleaching was severe at outbreak sites in 2002 but not at any of the surveyed sites in 2009. The iterative approach used here has led to an improved understanding of disease causation, will facilitate management responses and can be applied to other coral diseases and/or other regions.

Keywords

Climate change Coral disease Great Barrier Reef Environmental management Outbreaks White Syndromes 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • J. A. Maynard
    • 1
  • K. R. N. Anthony
    • 2
    • 3
  • C. D. Harvell
    • 4
  • M. A. Burgman
    • 1
  • R. Beeden
    • 5
  • H. Sweatman
    • 6
  • S. F. Heron
    • 7
    • 8
  • J. B. Lamb
    • 9
  • B. L. Willis
    • 2
    • 9
  1. 1.Australian Centre of Excellence for Risk Analysis, School of BotanyUniversity of MelbourneParkvilleAustralia
  2. 2.ARC Centre of Excellence for Coral Reef StudiesJames Cook University of North QueenslandTownsvilleAustralia
  3. 3.Global Change InstituteUniversity of QueenslandSt LuciaAustralia
  4. 4.Department of Ecology and Evolutionary BiologyCornell UniversityIthacaUSA
  5. 5.Climate Change GroupGreat Barrier Reef Marine Park AuthorityTownsvilleAustralia
  6. 6.Australian Institute of Marine ScienceCape FergusonAustralia
  7. 7.NOAA Coral Reef WatchTownsvilleAustralia
  8. 8.School of Engineering and Physical SciencesJames Cook University of North QueenslandTownsvilleAustralia
  9. 9.School of Marine and Tropical BiologyJames Cook University of North QueenslandTownsvilleAustralia

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