Simultaneous extension of both basic microstructural components in scleractinian coral skeleton during night and daytime,visualized by in situ 86Sr pulse labeling |
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| Institution: | 1. UMR7245 CNRS-MNHN Molécules de Communication et Adaptation des Microorganismes, Muséum National d’Histoire Naturelle, Paris, France;2. Institute of Paleobiology, Polish Academy of Sciences, ul. Twarda 51/55, PL-00-818 Warszawa, Poland;3. UMR7159 ISPL-LOCEAN, Institut de Recherche pour le Développement, Bondy, France;4. The Laboratory for Molecular Marine Ecology (LMME) Bar-Ilan University, Ramat-Gan, Israel;5. Department of Environmental Sciences, The Weizmann Institute of Sciences, Rehovot, Israel;6. Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering (ENAC), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland;1. Department of Nuclear and Medical Physics, V.N. Karazin Kharkiv National University, 4 Svobody Sq., Kharkov 61077, Ukraine;2. Institute of Health Biosciences, Graduate School of Pharmaceutical Sciences, The University of Tokushima, 1-78-1 Shomachi, Tokushima 770-8505, Japan;3. Department of Medicinal Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8412, Japan;4. Lipid Research Group, Gastroenterology, Hepatology and Nutrition Division, The Children’s Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104-4318, United States;1. Department of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada;2. Laboratory of Bioinformatics and Protein Engineering, International Institute of Molecular and Cell Biology, ul. Ks. Trojdena 4, Warsaw 02-109, Poland;3. Manitoba Institute for Materials, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada;4. NCMH Laboratory, School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, UK;5. Laboratory of Bioinformatics, Institute of Molecular Biology and Biotechnology, Faculty of Biology, Adam Mickiewicz University, ul. Umultowska 89, Poznan 61-614, Poland;6. Department of Biochemistry and Medical Genetics, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada;7. School of Biosciences, University of Birmingham, Birmingham B152TT, UK;1. Max Planck Institute for Biophysical Chemistry, Department for NMR-based Structural Biology, Am Fassber 11, 37077 Göttingen, Germany;2. Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Am Fassberg 11, 37077 Göttingen, Germany;3. Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, ?wirki i Wigury 101, 02-089 Warsaw, Poland;4. International Institute of Molecular and Cell Biology, Trojdena 4, 02-109 Warsaw, Poland;5. Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106 Warsaw, Poland;6. NanoBioMedical Centre, Adam Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland;1. School of Oceanography, University of Washington, Seattle, WA 98195, United States;2. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354, United States;3. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, United States;4. Earth and Planetary Sciences, University of California—Davis, Davis, CA 95616, United States;5. Lamont-Doherty Earth Observatory and Department of Earth and Environmental Sciences of Columbia University, Palisades, NY 10964, United States;1. LSCE Domaine du CNRS, 91198 Gif sur Yvette, France;2. CSM Avenue Saint-Martin, MC-98000 Monaco, Principality of Monaco;3. Univ Paris 06, Ctr IRD France Nord, UPMC CNRS IRD MNHN, IPSL LOCEAN, 32 Ave Henri Varagnat, F-93143 Bondy, France |
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| Abstract: | Using in situ (12 h) pulse-labeling of scleractinian coral aragonitic skeleton with stable 86Sr isotope, the diel pattern of skeletal extension was investigated in the massive Porites lobata species, grown at 5 m depth in the Gulf of Eilat. Several microstructural aspects of coral biomineralization were elucidated, among which the most significant is simultaneous extension of the two basic microstructural components Rapid Accretion Deposits (RAD; also called Centers of Calcification) and Thickening Deposits (TD; also called fibers), both at night and during daytime. Increased thickness of the 86Sr-labeled growth-front in the RADs compared to the adjacent TDs revealed that in this species RADs extend on average twice as fast as TDs. At the level of the individual corallite, skeletal extension is spatially highly heterogeneous, with sporadic slowing or cessation depending on growth directions and skeletal structure morphology. Daytime photosynthesis by symbiotic dinoflagellates is widely acknowledged to substantially increase calcification rates at the colony and the corallite level in reef-building corals. However, in our study, the average night-time extension rate (visualized in three successive 12 h pulses) was similar to the average daytime extension (visualized in the initial 12 h pulse), in all growth directions and skeletal structures. This research provides a platform for further investigations into the temporal calibration of coral skeletal extension via cyclic growth increment deposition, which is a hallmark of coral biomineralization. |
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| Keywords: | Coral skeleton Microstructure Linear extension Diel rythm Strontium labeling |
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