caa a22 4500 445819685 CHVBK 20180317145240.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s00338-011-0744-4 doi (NATIONALLICENCE)springer-10.1007/s00338-011-0744-4 CNP budgets of a coral-dominated fringing reef at La Réunion, France: coupling of oceanic phosphate and groundwater nitrate [Elektronische Daten] [P. Cuet, M. Atkinson, J. Blanchot, B. Casareto, E. Cordier, J. Falter, P. Frouin, H. Fujimura, C. Pierret, Y. Susuki, C. Tourrand] Productivity, nutrient input, nutrient uptake, and release rates were determined for a coral-dominated reef flat at La Réunion, France, to assess the influence of groundwater nitrogen on carbon and nutrient budgets. Water samples were collected offshore in the ocean, at the reef crest and back reef for nutrients, picoplankton, pH, and total alkalinity. Volume transport of ocean water across the reef flat was measured using both current meters and drogues. Groundwater advected onto the reef flat and mixed with incoming ocean water. Metabolic rates for the reef community were determined to be: gross primary production=1,000mmolCm−2d−1, community respiration=960mmolCm−2d−1, and community calcification=210mmol Cm−2d−1. Across the reef flat, silicate behaved conservatively, there was net uptake of phosphate (0.06mmolPm−2d−1) and net release of nitrate, ammonia, dissolved and particulate organic nitrogen (total 7.0mmolNm−2d−1). Groundwater nitrate contributed 37% of the increase in nitrate plus ammonia. The first-order mass transfer coefficient of phosphate was 3.3md−1, and for nitrate plus ammonia, 5.9md−1. Gross N and P uptake from estimates of mass transfer and uptake of particles were 0.37mmolPm−2d−1 and 7.2mmolNm−2d−1, respectively giving an N:P uptake ratio of 20:1. Thus, the elevation of nitrogen across the reef flat maintains a high N:P flux, enhancing algal growth downstream of the transect. We conclude that net community production (40mmolCm−2d−1) was sustained by net uptake of phosphate from the ocean and net uptake of new nitrogen from groundwater. Springer-Verlag, 2011 Coral reef nationallicence Productivity nationallicence Nutrient budget nationallicence Groundwater nationallicence CNP nationallicence Cuet P. ECOMAR, Université de la Réunion, 15 Av. René Cassin, BP 7151, 97715, St-Denis Messag. Cedex 9, France aut Atkinson M. Hawaii Institute of Marine Biology, PO Box 1346, 96744, Coconut Island, Kaneohe, HI, USA aut Blanchot J. UMR 213«LOPB», IRD - Université Aix-Marseille, Campus de Luminy, Case 901, 13288, Marseille Cedex 09, France aut Casareto B. Global Biogeochemistry Laboratory, Shizuoka University, Oya 836, 422-8529, Shizuoka, Japan aut Cordier E. ECOMAR, Université de la Réunion, 15 Av. René Cassin, BP 7151, 97715, St-Denis Messag. Cedex 9, France aut Falter J. Hawaii Institute of Marine Biology, PO Box 1346, 96744, Coconut Island, Kaneohe, HI, USA aut Frouin P. ECOMAR, Université de la Réunion, 15 Av. René Cassin, BP 7151, 97715, St-Denis Messag. Cedex 9, France aut Fujimura H. Global Biogeochemistry Laboratory, Shizuoka University, Oya 836, 422-8529, Shizuoka, Japan aut Pierret C. ECOMAR, Université de la Réunion, 15 Av. René Cassin, BP 7151, 97715, St-Denis Messag. Cedex 9, France aut Susuki Y. Global Biogeochemistry Laboratory, Shizuoka University, Oya 836, 422-8529, Shizuoka, Japan aut Tourrand C. ECOMAR, Université de la Réunion, 15 Av. René Cassin, BP 7151, 97715, St-Denis Messag. Cedex 9, France aut Coral Reefs Springer-Verlag 30(2011-06-01), 45-55 0722-4028 30<45 2011 30 338 https://doi.org/10.1007/s00338-011-0744-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00338-011-0744-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cuet P. ECOMAR, Université de la Réunion, 15 Av. René Cassin, BP 7151, 97715, St-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 700 1- Blanchot J. UMR 213«LOPB», IRD - Université Aix-Marseille, Campus de Luminy, Case 901, 13288, Marseille Cedex 09, France aut NATIONALLICENCE 700 1- Casareto B. Global Biogeochemistry Laboratory, Shizuoka University, Oya 836, 422-8529, Shizuoka, Japan aut NATIONALLICENCE 700 1- Cordier E. ECOMAR, Université de la Réunion, 15 Av. René Cassin, BP 7151, 97715, St-Denis Messag. Cedex 9, France aut NATIONALLICENCE 700 1- Falter J. Hawaii Institute of Marine Biology, PO Box 1346, 96744, Coconut Island, Kaneohe, HI, USA aut NATIONALLICENCE 700 1- Frouin P. ECOMAR, Université de la Réunion, 15 Av. René Cassin, BP 7151, 97715, St-Denis Messag. Cedex 9, France aut NATIONALLICENCE 700 1- Fujimura H. Global Biogeochemistry Laboratory, Shizuoka University, Oya 836, 422-8529, Shizuoka, Japan aut NATIONALLICENCE 700 1- Pierret C. ECOMAR, Université de la Réunion, 15 Av. René Cassin, BP 7151, 97715, St-Denis Messag. Cedex 9, France aut NATIONALLICENCE 700 1- Susuki Y. Global Biogeochemistry Laboratory, Shizuoka University, Oya 836, 422-8529, Shizuoka, Japan aut NATIONALLICENCE 700 1- Tourrand C. ECOMAR, Université de la Réunion, 15 Av. René Cassin, BP 7151, 97715, St-Denis Messag. Cedex 9, France aut NATIONALLICENCE 773 0- Coral Reefs Springer-Verlag 30(2011-06-01), 45-55 0722-4028 30<45 2011 30 338 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer