New research finds increased growth responsible for color changes in coral reefs

July 6, 2012
Red Sea Acropora coral shows blue colors in response to mechanical damage. Credit: University of Southampton

Research from the University of Southampton and National Oceanography, Southampton has provided new insight into the basic immune response and repair mechanisms of corals to disease and changing environmental conditions.

The study, published in the latest issue of the journal Coral Reefs, found that increased growth is the underlying physiological process associated with disease, wounding and stress-related colour changes in reef-building corals.

The study investigated distinct (GFP)-like pigments responsible for the green, red and purple-blue colours of many reef-building corals.

By examining these GFP-like pigments in four from the Red Sea, the Arabian/ and Fiji, researchers found that their presence indicates growing tissue in growing branch tips and margins of healthy ; as well as in disturbed colony parts, compared to undisturbed areas.

Dr Joerg Wiedenmann, Senior Lecturer of Biological Oceanography and Head of the Coral Reef Laboratory at the University of Southampton, who led the study, says: "The specific pigment signatures that we observed, demonstrate that locally accelerated growth in the presence of foreign biological material, represents a novel component of the of reef corals in which the animals try to neutralise potentially dangerous organisms by overgrowing them.

"We found that increased growth is the underlying physiological process of the 'pink-blue spot syndrome', a colour change linked, for instance, with wounding of Red . We also found a strong increase of red fluorescence in growth margins in the presence of gastropods and tube worms."

Montipora foliosa expresses purple chromoproteins in the growth margins (daylight image). Credit: University of Southampton

The researchers were able to detect and tissue proliferation by using the excellent biomarker properties of GFP-like pigments. Fluorescent proteins from reef corals are routinely applied as markers in biomedical and pharmaceutical research, because their fluorescence can be easily detected.

Dr Wiedenmann, who is based at National Oceanography Centre, Southampton, adds: "The future of coral reefs is strongly dependent on management strategies that can promote their recovery and resilience. The success of these efforts will rely on the identification of particularly vulnerable areas or regions affected by high levels of stress.

"Coral reef monitoring will benefit from this study as the use of these GFP-like pigments as biomarkers can be used as indicators of mechanical stress/damage inflicted, for instance, by swimmers or divers or give an indication of parasites or disease.

"Our conclusions have important implications for predictions of the negative impact of changing environmental conditions on . Reduced coral growth rates anticipated in response to ocean acidification, warming and nutrient enrichment of coral reef waters will result in a reduced capability of the corals to defend themselves against colonisation by other organisms."

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