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Formalising a mechanistic linkage between heterotrophic feeding and thermal bleaching resistance

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Abstract

In this paper, I utilise the CO2 (sink) limitation model of coral bleaching to propose a new biochemical framework that explains how certain (well-adapted) coral species can utilise heterotrophic carbon acquisition to combat the damaging algal photoinhibition response sequence that underpins thermal bleaching, thereby increasing thermal bleaching resistance. This mechanistic linkage helps to clarify a number of previously challenging experimental responses arising from feeding (versus starved) temperature stress experiments, and isotope labelling (tracer) experiments with heterotrophic carbon sources (e.g., zooplankton). In an era of rapidly warming surface ocean temperatures, the conferred fitness benefits arising from such a mechanistic linkage are considerable. Yet, various ecological constraints are outlined which caution against the ultimate benefit of the mechanism for raising bleaching thresholds at the coral community (reef) scale. Future experiments are suggested that can strengthen these proposed arguments.

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Acknowledgments

The paper benefited from the constructive comments and suggestions of three anonymous reviewers.

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Authors and Affiliations

  1. Australian Institute of Marine Science, PMB#3 Townsville MC, Townsville, 4810, Australia

    Scott A. Wooldridge

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  1. Scott A. Wooldridge
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Correspondence to Scott A. Wooldridge.

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Communicated by Biology Editor Dr. Mark Vermeij

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Wooldridge, S.A. Formalising a mechanistic linkage between heterotrophic feeding and thermal bleaching resistance. Coral Reefs 33, 1131–1136 (2014). https://doi.org/10.1007/s00338-014-1193-7

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  • DOI: https://doi.org/10.1007/s00338-014-1193-7

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