Mediterranean Institute of Oceanography, Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO UM 110, 13288 Marseille, France.
Mediterranean Institute of Oceanography, Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO UM 110, 13288 Marseille, France.
Mar Pollut Bull. 2021 Aug;169:112526. doi: 10.1016/j.marpolbul.2021.112526. Epub 2021 Jun 1.
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 h for pico- and 0.40 to 1.00 mg C m h for nanophytoplankton; mean N uptake was 2.02 μmol N m h for pico- and 1.25 μmol N m h for nanophytoplankton.
构建了一个生物地球化学模型 (ECO3M-Atoll) 来模拟 Ahe 环礁泻湖中的低食物网，该泻湖的浮游植物主要受氮限制。了解浮游植物（牡蛎的主要食物来源）的动态对于管理和分配新的珍珠养殖地点至关重要。在对模型进行现场观测参数化后，我们测试了关于氮循环的不同假设（底栖再矿化、大气 N 固定等），并将结果与大型观测数据集进行了比较。模型结果表明，模拟的（微微和纳米）浮游植物生物量和氮浓度与现场数据接近。模拟的生物地球化学过程（吸收和初级生产）也与观测值非常相似。在模型中，微微浮游植物的初级生产力范围为 1.00 至 2.00 mg C m h，纳米浮游植物的初级生产力范围为 0.40 至 1.00 mg C m h；微微浮游植物的平均氮吸收量为 2.02 μmol N m h，纳米浮游植物的平均氮吸收量为 1.25 μmol N m h。
