Multiple scattering on coral skeletons enhances light absorption by symbiotic algae

• DOI: 10.4319/lo.2005.50.4.1025
• Publication Date: 2010-07-01T22:15:50Z
• Authors: Susana Enríquez; Eugenio R. Méndez; Roberto Iglesias ...
• Keywords: Coral bleaching

The success of symbiotic reef-building corals is largely determined by the efficiency with which they collect solar energy. Using thin coral laminae from Caribbean scleractinian Porites branneri, we characterize absorption spectra intact surfaces. Comparisons a broad range photosynthetic pigment densities, collected during natural bleaching event, indicate that are capable collecting more than 85% radiation one order magnitude less density terrestrial leaves. Measurements light-absorption as function reveal algae in P. branneri absorb between two and five times light freshly isolated symbionts. A theoretical model shows multiple scattering skeleton can enhance local field, thus increasing absorption. As result this phenomenon, inhabiting high environments maximize their capacity low investment while reducing self-shading low-light environments. Local field enhancements may have negative effects when exposed to stressful conditions. During bleaching, increases irradiance associated reductions could exacerbate effect elevated temperatures. Symbiotic most efficient energy collectors nature, modulation internal be an important driving force evolution group.