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First published online February 29, 2008
Journal of Experimental Biology 211, 860-865 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.012807

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Uptake of dissolved free amino acids by the scleractinian coral Stylophora pistillata

Renaud Grover^1,*, Jean-François Maguer², Denis Allemand¹ and Christine Ferrier-Pagès¹

¹ Centre Scientifique de Monaco, Avenue Saint Martin, MC-98000, Monaco
² Laboratoire de Chimie Marine, Institut Universitaire Européen de la Mer, Place Nicolas Copernic, F-29280 Plouzane, France

View larger version (9K): [in this window] [in a new window]   Fig. 1. Uptake rates (nmol DFAA h–1 cm–2) by an entire microcolony of 11 amino acids tested separately at a final concentration of 3 µmol l–1, during 6 h incubation. Each value represents the mean ± s.d. of three individuals.

View larger version (8K): [in this window] [in a new window]   Fig. 2. (A) Calculated DFAA uptake rates (nmol N cm–2) at 0.5 µmol l–1 in the zooxanthellae (open circles) and in the animal tissue (filled circles), during a 21 h incubation. Open circles, y=1.75x–1.38, r2=0.99; filled circles, y=4.13x–4.67, r2=0.98. (B) Calculated DFAA uptake rates (nmol N cm–2) at 3 µmol l–1 in the zooxanthellae (open squares) and in the animal tissue (filled squares), during 21 h incubation. Open squares, y=5.18x–2.25, r2=0.99; filled squares, y=9.49x–6.27, r2=0.99. Each point represents the mean ± s.d. of three individuals.

View larger version (4K): [in this window] [in a new window]   Fig. 3. Concentration-dependent uptake of DFAA (nmol N h–1 cm–2) in the zooxanthellae (open squares) and the tissue (filled squares) compartments during 7 h incubation at 300 µmol photons m–2 s–1. Each point represents the mean ± s.d. of three individuals.

View larger version (4K): [in this window] [in a new window]   Fig. 4. Linear (diamonds) and saturable (circles) components of the biphasic mode of DFAA uptake by the animal tissue as a function of external concentration.

View larger version (12K): [in this window] [in a new window]   Fig. 5. Uptake rates at 0.5 µmol l–1 (white bars) and 3 µmol l–1 (grey bars) DFAA (nmol N h–1cm–2) during 7 h incubation under 0, 160 and 300 µmol photons m–2 s–1 in (A) coral tissue and (B) zooxanthellae. Each value represents the mean ± s.d. of three individuals. Asterisks indicate significant differences between uptake rates at 0.5 and 3 µmol l–1 for a given light intensity.

View larger version (3K): [in this window] [in a new window]   Fig. 6. Concentration-dependent %15N enrichment in freshly isolated zooxanthellae after 5 h incubation in 15N-DFAA under 160 µmol photons m–2 s–1. Each value represents the mean ± s.d. of three individuals.

View larger version (3K): [in this window] [in a new window]   Fig. 7. Concentration dependent %15N enrichment of zooxanthellae in hospite. Same conditions as in Fig. 3.

View larger version (7K): [in this window] [in a new window]   Fig. 8. % Contribution of each nutrient for tissue growth.