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首页> 外文期刊>Estuarine Coastal and Shelf Science >A spatially resolved model of seasonal variations in phytoplankton and clam (Tapes philippinarum) biomass in Barbamarco Lagoon, Italy
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A spatially resolved model of seasonal variations in phytoplankton and clam (Tapes philippinarum) biomass in Barbamarco Lagoon, Italy

机译：意大利巴尔巴马科泻湖浮游植物和蛤类生物量季节性变化的空间分辨模型

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摘要

Barbamarco Lagoon (area = 7 km~2) is in the Po River Delta, adjoining the Northern Adriatic Sea, and supports a commercially valuable clam (Tapes philippinarum) fishery. This study investigated interactions of the lagoon with adjacent coastal waters and inland riverine inputs by modelling both the lagoon and the Northern Adriatic Sea, using a coupled three-dimensional (3D) hydrodynamic-ecological model (ELCOM-CAEDYM) adapted to include the clam population. The clam model accounted for carbon (C), nitrogen (N) and phosphorus (P) biomass in the benthos through parameterisations for filtration, excretion, egestion, respiration, mortality, and harvesting. Multiple clam size classes were included in a new population dynamics sub-model. Output from the coupled model was validated against hydro-dynamic and water quality data from intensive field sampling and routine monitoring. Time scales of tidal flushing, primary production and clam grazing were investigated with the model to demonstrate that food supply to clam populations is dominated by phytoplankton inputs from the Northern Adriatic Sea. Effects of clam cultivation on nutrient concentrations and phytoplankton biomass in Barbamarco Lagoon were primarily localised, with strong tidal flushing minimising impacts of clam filtration on lagoon-wide nutrient concentrations at current clam stocking levels. Clam populations were found to alter the cycling of nutrients in the system, causing the lagoon to become a net sink for particulate organic matter and to export dissolved organic matter to the adjacent sea via tidal flushing. Ecosystem health and sensitivity of nutrient cycles to clam cultivation are important considerations for the long term sustainable management and potential expansion of the fishery.
机译：Barbamarco泻湖（面积= 7 km〜2）位于Po河三角洲，毗邻北亚得里亚海，并支持具有商业价值的蛤（Tapes philippinarum）渔业。这项研究通过对泻湖和北亚得里亚海进行建模，使用耦合的三维（3D）水动力-生态模型（ELCOM-CAEDYM）来研究泻湖与邻近沿海水域和内陆河流输入的相互作用。 。蛤模型通过过滤，排泄（例如排泄），呼吸作用，死亡率和收成的参数化来说明底栖生物中的碳（C），氮（N）和磷（P）生物量。新的种群动态子模型中包含多个蛤类大小类别。对照来自密集现场采样和常规监测的流体动力学和水质数据验证了耦合模型的输出。利用该模型调查了潮汐冲刷，初级生产和蛤lam放牧的时间尺度，以证明蛤类种群的食物供应主要来自北亚得里亚海的浮游植物输入。蛤类养殖对Barbamarco泻湖中养分浓度和浮游植物生物量的影响主要是局部的，在目前的蛤stock养殖水平下，强潮水冲刷可将蛤filtration过滤对整个泻湖中养分浓度的影响降至最低。发现蛤种群改变了系统中养分的循环，使泻湖变成了有机颗粒物的净汇，并通过潮汐冲刷将溶解的有机物输出到附近的海域。生态系统健康和养分循环对蛤类养殖的敏感性是长期可持续管理和渔业潜在扩展的重要考虑因素。

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