Economic modelling as a tool to support macroalgal bloom management: a case study (Sacca di Goro, Po river delta)

Francesca Cellina , Guilio A. De Leo , Andrea E. Rizzoli , Pierluigi Viaroli , Marco Bartoli
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引用次数: 18

Abstract

During the last 20 years, intensive mollusk farming has been developed in coastal waters, mostly in sheltered bays and lagoons. Often, mollusk stocks are threatened by frequent anoxic events from macroalgal blooms. Here, a decision support tool is described to select the optimal short-term strategy to control algal biomasses. Even though long-term and detailed studies of the lagoon systems are required to provide reliable, biologically based policies, we have here developed a simplified analysis that overlooks most of the ecological complexity, but explicitly includes environmental variability and uncertainty in parameter estimation in the economic assessment of the performances of different management strategies. The aim is to quickly screen management alternatives of harvesting Ulva rigida biomass in terms of the control measures considered, i.e. the number of vessels used (the harvesting effort) and the U. rigida density at which the vessels start to operate. The decision support tool was applied to the Sacca di Goro, the southernmost coastal lagoon of the Italian Po river delta, where intensive farming of the clam Tapes philippinarum occurs. The results of the analysis indicate that an intermediate number of vessels should start operating as soon as U. rigida biomass exceeds low thresholds.

经济模型作为支持大型藻华管理的工具:案例研究(波河三角洲Sacca di Goro)
在过去的20年里,密集的软体动物养殖已经在沿海水域发展起来,主要是在有庇护的海湾和泻湖。软体动物种群经常受到大型藻华引起的缺氧事件的威胁。本文介绍了一种决策支持工具,用于选择控制藻类生物量的最佳短期策略。尽管需要对泻湖系统进行长期和详细的研究,以提供可靠的、基于生物学的政策,但我们在这里开发了一种简化的分析,该分析忽略了大多数生态复杂性,但明确地包括环境变异性和不同管理策略绩效的经济评估中参数估计的不确定性。目的是根据所考虑的控制措施,即使用的船只数量(收获努力)和船只开始运行时的僵硬藻密度,快速筛选收集僵硬藻生物量的管理替代方案。决策支持工具应用于Sacca di Goro,这是意大利波河三角洲最南端的沿海泻湖,这里集中养殖菲律宾蛤带。分析结果表明,一旦刚性藻生物量超过低阈值,就应该开始运行中等数量的容器。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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