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First published online January 3, 2006
Journal of Experimental Biology 209, 273-283 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.01983

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Diel `tuning' of coral metabolism: physiological responses to light cues

O. Levy^1,*, Y. Achituv¹, Y. Z. Yacobi², Z. Dubinsky¹ and N. Stambler¹

¹ Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
² Israel Oceanographic and Limnological Research, Kinneret Limnological Laboratory, Migdal 14950, Israel

View larger version (33K): [in a new window]   Fig. 1. (A) Changes in light intensity at a depth of 4-5 m in Eilat, Red Sea on 3 March 2002 (solid line) and net oxygen fluxes measured using the three-chamber submersible respirometer. The values are per liter and disregard differences in coral size. G. lobata (filled squares), F. favus (triangles) and P. sinuosa (diamonds). (B) UVA + UVB radiation (300-398 nm) at the 5-m depth observed from diurnal measurements conducted in February 2001. (C-E) In situ gross photosynthesis-irradiance curves for the corals (C) Favia favus (N=3), (D) Plerogyra sinuosa coral (N=3) and (E) Goniopora lobata (N=2). Measurements were performed in the Red Sea, Eilat on three consecutive days, 3-5 March 2002.

View larger version (30K): [in a new window]   Fig. 2. Diel cycles of in situ measurements of net photosynthesis (circles) and light intensity (solid line) of the corals F. favus (A), P. sinuosa (B) and G. lobata (C), performed using the three-chamber submersible respirometer. Changes in the maximum quantum yield of photochemistry in PSII under ambient light (F'/Fm'; triangles) were determined using the fast repetition rate fluorometer (FRRF). Measurements were performed in Eilat, Red Sea between 31 July and 2 August 2001.

View larger version (28K): [in a new window]   Fig. 3. Diurnal cycle of the functional absorption cross section for PSII (PSII; circles), non-photochemical quenching (NPQ) (triangles) and light intensity (solid line) as recorded in the corals (A) P. sinuosa and (B) F. favus.

View larger version (23K): [in a new window]   Fig. 4. Diel cycle of superoxide dismutase (SOD) enzyme activities from animal tissue and symbiotic zooxanthellae collected at the 5-m depth in Eilat, Red Sea. Measurements were performed between 3 and 5 March 2002. Activity is presented as % activity [(U mg-1 protein)/(max U mg-1 protein)] for (A) F. favus (N=3), (B) G. lobata (N=2) and (C) P. sinuosa (N=3). The black bars represent SOD activity of the animal tissue and the gray bars represent SOD activity of the zooxanthellae. Values are represented as means ± s.d. (night=05.00 h; morning=08.00 h; mid.=10.00-14.00 h; afternoon= 16.00 h).

View larger version (22K): [in a new window]   Fig. 5. Diel cycle of catalase (CAT) activity from coral tissue and symbiotic zooxanthellae at the 5-m depth in Eilat, Red Sea. Measurements were performed between 3 and 5 March 2002. Activity is presented as % activity [(U mg-1 protein)/(max U mg-1 protein)] for (A) F. favus (N=3), (B) G. lobata (N=2) and (C) P. sinuosa (N=3). The black bars represent CAT activity of the animal tissue and the gray bars represent CAT activity of the zooxanthellae. Values are represented as means ± s.d. (night=05.00 h; morning=08.00 h; mid.=10.00-14.00 h; afternoon= 16.00 h).