FN Archimer Export Format PT J TI Biogeochemical model of nitrogen cycling in Ahe (French Polynesia), a South Pacific coral atoll with pearl farming BT AF Seceh, C. Pinazo, C. Rodier, Martine Lajaunie-Salla, K. Mazoyer, C. Grenz, C. Le Gendre, Romain AS 1:1;2:1;3:1;4:1;5:1;6:1;7:2; FF 1:;2:;3:;4:;5:;6:;7:PDG-RBE-LEADNC; C1 Mediterranean Institute of Oceanography, Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO UM 110, 13288 Marseille, France IFREMER, UMR9220 ENTROPIE, IRD, IFREMER, Université de la Réunion, CNRS, Université de Nouvelle-Calédonie, BP 32078, 98897 Nouméa, New Caledonia C2 UNIV AIX MARSEILLE, FRANCE IFREMER, FRANCE SI NOUMEA SE PDG-RBE-LEADNC UM ENTROPIE IN WOS Ifremer UMR copubli-france copubli-univ-france IF 7.001 TC 4 UR https://archimer.ifremer.fr/doc/00697/80891/88930.pdf LA English DT Article DE ;Biogeochemical model;Ahe atoll;Pearl farming;Phytoplankton;Nitrogen cycle AB A biogeochemical model (ECO3M-Atoll) was configured to simulate the lower food web in Ahe Atoll lagoon where phytoplankton is mostly nitrogen limited. Understanding the dynamics of phytoplankton – the main food source for oysters – is crucial for the management and the allocation of new pearl farming sites. After parametrizing the model with in situ observations, we tested different hypotheses about nitrogen cycling (benthic remineralization, atmospheric N fixation, etc.) and compared the results to a large observational dataset. Model results show that simulated (pico- and nano-) phytoplankton biomass and nitrogen concentrations are close to in situ data. The simulated biogeochemical processes (uptake and primary production) are also very similar to the observed values. In the model, primary production ranged from 1.00 to 2.00 mg C m−3 h−1 for pico- and 0.40 to 1.00 mg C m−3 h−1 for nanophytoplankton; mean N uptake was 2.02 μmol N m−3 h−1 for pico- and 1.25 μmol N m−3 h−1 for nanophytoplankton. PY 2021 PD AUG SO Marine Pollution Bulletin SN 0025-326X PU Elsevier BV VL 169 UT 000679311200009 DI 10.1016/j.marpolbul.2021.112526 ID 80891 ER EF