caa a22 4500 44581991X CHVBK 20180317145241.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s00338-011-0801-z doi (NATIONALLICENCE)springer-10.1007/s00338-011-0801-z Changes in scleractinian coral Seriatopora hystrix morphology and its endocellular Symbiodinium characteristics along a bathymetric gradient from shallow to mesophotic reef [Elektronische Daten] [O. Nir, D. Gruber, S. Einbinder, S. Kark, D. Tchernov] The algae living endosymbiotically within coral are thought to increase algal pigmentation with increasing depth to capture the diminishing light. Here, we follow distribution of the hermatypic coral Seriatopora hystrix along a 60-m bathymetric gradient in the Gulf of Eilat, Red Sea, to study coral ecophysiology and response to light regimes. Combining work on coral morphology, pigment content and genotyping of the photosymbiont, we found that total chlorophyll concentration per zooxanthellae cell and the dark- and light-acclimated quantum yield of photosystem II did not vary significantly along the 60-m gradient. However, the chlorophyll a/c ratio increased with depth. This suggests that the symbiotic algae in S. hystrix possess a mechanism for acclimatization or adaptation that differs from previously described pathways. The accepted photoacclimatory process involves an increase in chlorophyll content per alga as light intensity decreases. Based on corallite and branch morphology, this research suggests that S. hystrix has two depth-dependent ecophenotypes. Above 10 m depth, S. hystrix exhibits sturdier colony configurations with thick branches, while below 30 m depth, colonies are characterized by thin branches and the presence of a larger polyp area. Between 10 and 30 m depth, both ecophenotypes are present, suggesting that corallite morphology may act as another axis of photoacclimation with depth. Springer-Verlag, 2011 Scleractinian coral nationallicence Symbiodinium sp nationallicence Deep reef nationallicence Morphology nationallicence Photosynthesis nationallicence Seriatopora hystrix nationallicence Chlorophyll a/c ratio nationallicence Nir O. Interuniversity Institute for Marine Sciences in Eilat, P.O. Box 469, Eilat, Israel aut Gruber D. Department of Natural Sciences, City University of New York, Baruch College, 17 Lexington Avenue, P.O. Box A-0506, 10010, New York, NY, USA aut Einbinder S. Interuniversity Institute for Marine Sciences in Eilat, P.O. Box 469, Eilat, Israel aut Kark S. Department of Evolution, Systematics and Ecology, Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, 91904, Jerusalem, Israel aut Tchernov D. Interuniversity Institute for Marine Sciences in Eilat, P.O. Box 469, Eilat, Israel aut Coral Reefs Springer-Verlag 30/4(2011-12-01), 1089-1100 0722-4028 30:4<1089 2011 30 338 https://doi.org/10.1007/s00338-011-0801-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00338-011-0801-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nir O. Interuniversity Institute for Marine Sciences in Eilat, P.O. Box 469, Eilat, Israel aut NATIONALLICENCE 700 1- Gruber D. Department of Natural Sciences, City University of New York, Baruch College, 17 Lexington Avenue, P.O. Box A-0506, 10010, New York, NY, USA aut NATIONALLICENCE 700 1- Einbinder S. Interuniversity Institute for Marine Sciences in Eilat, P.O. Box 469, Eilat, Israel aut NATIONALLICENCE 700 1- Kark S. Department of Evolution, Systematics and Ecology, Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, 91904, Jerusalem, Israel aut NATIONALLICENCE 700 1- Tchernov D. Interuniversity Institute for Marine Sciences in Eilat, P.O. Box 469, Eilat, Israel aut NATIONALLICENCE 773 0- Coral Reefs Springer-Verlag 30/4(2011-12-01), 1089-1100 0722-4028 30:4<1089 2011 30 338 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer