caa a22 4500 445819693 CHVBK 20180317145240.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s00338-010-0712-4 doi (NATIONALLICENCE)springer-10.1007/s00338-010-0712-4 Water velocity dependence of phosphate uptake on a coral-dominated fringing reef flat, La Réunion Island, Indian Ocean [Elektronische Daten] [P. Cuet, C. Pierret, E. Cordier, M. Atkinson] Phosphate uptake (P-uptake) into coral reef communities has been hypothesized to be mass-transfer limited. One method of demonstrating mass-transfer limitation of P-uptake is to show dependence of P-uptake on water velocity. Water velocity across reef flats varies with tides and swell; thus, we measured P-uptake over the entire reef flat on eight different days, representing a range in water velocities. P-uptake was calculated from changes in P concentration of the water column. Changes in P concentration were measured by water sampling at six sites along a 300-m cross-reef transect while simultaneously measuring water velocity. To smooth the variability in phosphate concentrations, peristaltic pumps were used to get time-integrated water samples for 4-6h at each site. Water velocities were measured in the middle of the transect using an acoustic Doppler current profiler and were averaged to match the time-integrated water sampling. Depth-averaged cross-reef water velocities were 0.031±0.013ms−1 (mean±SD), while the root-mean-square water velocities, accounting for oscillatory flow, averaged 3.3 times higher, 0.101±0.021ms−1 (mean±SD). Phosphate decreased along all transects. The first-order rate constant for P-uptake (S) was 8.5±2.4md−1 (mean±SD) and increased linearly with root-mean-square water velocity. The Stanton number derived from oscillatory flow, the ratio of the first-order rate constant for P-uptake to the root-mean-square water velocity (S/U rms), was (9.4±1.2)×10−4 (mean±SD). P-uptake ranged from 0.2 to 1.1mmol Pm−2d−1, demonstrating that P-uptake is variable on short time scales and is directly related to P concentration and water velocity. Springer-Verlag, 2011 Nutrient uptake nationallicence Phosphate nationallicence Water velocity nationallicence Coral reefs nationallicence Cuet P. Université de la Réunion, ECOMAR, 15 Av. René Cassin, BP 7151, 97715, Saint-Denis Messag. Cedex 9, France aut Pierret C. Université de la Réunion, ECOMAR, 15 Av. René Cassin, BP 7151, 97715, Saint-Denis Messag. Cedex 9, France aut Cordier E. Université de la Réunion, ECOMAR, 15 Av. René Cassin, BP 7151, 97715, Saint-Denis Messag. Cedex 9, France aut Atkinson M. Hawaii Institute of Marine Biology, PO Box 1346, 96744, Coconut Island, Kaneohe, HI, USA aut Coral Reefs Springer-Verlag 30(2011-06-01), 37-43 0722-4028 30<37 2011 30 338 https://doi.org/10.1007/s00338-010-0712-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00338-010-0712-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cuet P. Université de la Réunion, ECOMAR, 15 Av. René Cassin, BP 7151, 97715, Saint-Denis Messag. Cedex 9, France aut NATIONALLICENCE 700 1- Pierret C. Université de la Réunion, ECOMAR, 15 Av. René Cassin, BP 7151, 97715, Saint-Denis Messag. Cedex 9, France aut NATIONALLICENCE 700 1- Cordier E. Université de la Réunion, ECOMAR, 15 Av. René Cassin, BP 7151, 97715, Saint-Denis Messag. Cedex 9, France aut NATIONALLICENCE 700 1- Atkinson M. Hawaii Institute of Marine Biology, PO Box 1346, 96744, Coconut Island, Kaneohe, HI, USA aut NATIONALLICENCE 773 0- Coral Reefs Springer-Verlag 30(2011-06-01), 37-43 0722-4028 30<37 2011 30 338 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer