UV-absorbing compounds in the coral PociZZopora dumicomis: Interactive effects of UV radiation, photosynthetically active radiation, and water flow Abstract-A direct relationship exists between irradiance of solar ultraviolet (UV) radiation and concentration of UV-absorbing compounds, know as mycosporine-like amino acids (MAAs), in the Hawaiian reef coral Pocilloporu dumicornis. However, MAA concentration is also influenced by flow regime and the irradiance of photosynthetically active radiation (PAR). High irradiances of UV radiation in reef environments are correlated with high PAR and high water velocity, because all three parameters diminish exponentially with increased depth. This correlation can also be found along horizontal gradients on reefs. The clearest water is typically found on outer reefs growing in oceanic water. These ocean reefs typicall
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