Fluorescent pigments in corals are photoprotective

@article{Salih2000FluorescentPI,
  title={Fluorescent pigments in corals are photoprotective},
  author={A. Salih and A. Larkum and G. Cox and M. K{\"u}hl and O. Hoegh-Guldberg},
  journal={Nature},
  year={2000},
  volume={408},
  pages={850-853}
}
All reef-forming corals depend on the photosynthesis performed by their algal symbiont, and such corals are therefore restricted to the photic zone. The intensity of light in this zone declines over several orders of magnitude—from high and damaging levels at the surface to extreme shade conditions at the lower limit. The ability of corals to tolerate this range implies effective mechanisms for light acclimation and adaptation. Here we show that the fluorescent pigments (FPs) of corals provide… Expand
Acclimatization of symbiotic corals to mesophotic light environments through wavelength transformation by fluorescent protein pigments
TLDR
It is demonstrated that host pigments, specifically photoconvertible red fluorescent proteins (pcRFPs), can promote coral adaptation/acclimatization to deeper-water light environments by transforming the prevalent blue light into orange-red light, which can penetrate deeper within zooxanthellae-containing tissues; this facilitates a more homogeneous distribution of photons across symbiont communities. Expand
Scleractinian corals with photoprotective host pigments are hypersensitive to thermal bleaching
TLDR
Investigation in the reef-building coral Acropora aspera from Heron Island Research Station (Great Barrier Reef, Australia), which occurs as 3 distinct colour morphs, suggests that the protection offered by pocilloporins and other GFP-homologues is reduced by thermal stress, potentially leaving the shade-acclimated symbionts of heavily pigmented corals exposed to high light levels. Expand
Photosynthesis and Bio-Optical Properties of Fluorescent Mesophotic Corals
Mesophotic coral ecosystems (MCEs) are light-dependent coral-associated communities found at 30–150 m depth. Corals inhabiting these deeper reefs are often acclimatized to a limited and blue-shiftedExpand
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The light field on coral reefs varies in intensity and spectral composition, and is the key regulating factor for phototrophic reef organisms such as scleractinian corals harboring microalgalExpand
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Although changes in the photosynthetic activity of symbiotic dinoflagellates over a diurnal irradiance cycle do not cause a measurable decline in net oxygen evolution for coral colonies, repeated exposure to excessive irradiance can reduce energy acquisition per unit surface area, and hence influence the upper limit of the depth distribution of scleractinian corals. Expand
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It is shown that fluorescence is significantly influenced by light and, therefore, by depth, and supports the “sunscreen” hypothesis and concludes thatfluorescence plays a role in the coral’s defense mechanism against harmful radiation. Expand
Spectral Diversity and Regulation of Coral Fluorescence in a Mesophotic Reef Habitat in the Red Sea
TLDR
It is shown that green-to-red photoconversion of fluorescent pigments mediated by short-wavelength light can occur also at depths where ultraviolet wavelengths are absent from the underwater light field. Expand
Host pigments: potential facilitators of photosynthesis in coral symbioses.
TLDR
It is demonstrated that two of the non-fluorescent host pigments are responsive to changes in external irradiance, with someHost pigments up-regulating in response to elevated irradiance to facilitate the retention of antennal chlorophyll by endosymbionts and hence, photosynthetic capacity. Expand
The role of host-based color and fluorescent pigments in photoprotection and in reducing bleaching stress in corals
TLDR
The spectral properties of GFP-like pigments of many common, shallow reef corals match the absorption of dinoflagellate pigments and demonstrate strong evidence for their photoprotective function by absorbing high energy, damaging solar radiation, dissipating excess energy via fluorescence and by overall photon removal/deflection. Expand
Blue light regulation of host pigment in reef-building corals
TLDR
The specific regulation patterns suggest complex functions of GFP-like proteins related to the photobiology of reef corals, and the distinct response of coral coloration to light climate promises that the pigment complement can be predicted in natural habitats. Expand
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