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|Title:||Red light represses the photophysiology of the scleractinian coral Stylophora pistillata|
Van Melis, Anne
Silva, Catarina I. F.
Leal, Miguel C.
|Publisher:||Public Library of Science|
|Abstract:||Light spectrum plays a key role in the biology of symbiotic corals, with blue light resulting in higher coral growth, zooxanthellae density, chlorophyll a content and photosynthesis rates as compared to red light. However, it is still unclear whether these physiological processes are blue-enhanced or red-repressed. This study investigated the individual and combined effects of blue and red light on the health, zooxanthellae density, photophysiology and colouration of the scleractinian coral Stylophora pistillata over 6 weeks. Coral fragments were exposed to blue, red, and combined 50/50% blue red light, at two irradiance levels (128 and 256 μmol m−2 s−1). Light spectrum affected the health/survival, zooxanthellae density, and NDVI (a proxy for chlorophyll a content) of S. pistillata. Blue light resulted in highest survival rates, whereas red light resulted in low survival at 256 μmol m−2 s−1. Blue light also resulted in higher zooxanthellae densities compared to red light at 256 μmol m−2 s−1, and a higher NDVI compared to red and combined blue red light. Overall, our results suggest that red light negatively affects the health, survival, symbiont density and NDVI of S. pistillata, with a dominance of red over blue light for NDVI.|
|Appears in Collections:||CESAM - Artigos|
DBio - Artigos
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|Wijgerde et al. - 2014 - Red Light Represses the Photophysiology of the Scl.pdf||3.07 MB||Adobe PDF||View/Open|
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