In shallow water, corals sport fluorescent colors to absorb and reflect damaging wavelengths from the sun, protecting symbiotic single-celled organisms called zooxanthellae, which provide food to corals, according to University of Southampton reef scientist Joerg Wiedenmann. His team has recently discovered that, in turn, corals turn blue-spectrum wavelengths that reach them in deep water to orange and red to help them get more sunlight and aid photosynthesis.
Corals' bright colors protect them from sunlight and help photosynthesis
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