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Reservoir fertilisation and fishery response in a highly managed reservoir with uncertain flows: Ecosystem‐based management using decision analysis
Fisheries Management and Ecology ( IF 2 ) Pub Date : 2021-02-28 , DOI: 10.1111/fme.12477
Patricia Woodruff 1 , Brett T. Poorten 2 , Villy Christensen 1 , Carl J. Walters 1
Affiliation  

Inland fisheries managers must account for multiple competing uses for aquatic resources; using methods such as ecosystem‐based management allows for different priorities for aquatic ecosystems to be accounted for. Declining abundance of kokanee salmon Oncorhynchus nerka (Walbaum) in Arrow Lakes Reservoir in the 1990s led to the use of large‐scale nutrient addition to improve productivity of kokanee and large piscivores. However, it is unclear what effect these measures had on the system given high discharge and highly variable annual flow regime throughout the watershed. An Ecopath with Ecosim model of the ecosystem was fitted to the available data and used to predict ecosystem structure and reservoir objectives under different nutrient addition strategies and varying annual flow regimes. Results from the model indicate that nutrient addition is an important driver in the system, with lower flows resulting in higher biomass for higher trophic levels. Decision analysis demonstrated the importance of maintaining nutrient additions to achieve management objectives despite losses in some high‐flow years.

中文翻译:

在流量不确定的高度管理的水库中的水库施肥和渔业响应:使用决策分析的基于生态系统的管理

内陆渔业管理者必须考虑水生资源的多种竞争用途;使用基于生态系统的管理等方法可以考虑到水生生态系统的不同优先事项。Kokanee鲑Oncorhynchus nerka的数量下降(Walbaum)在1990年代的箭头湖水库中导致使用大量营养添加物来提高kokanee和大型食肉动物的生产力。但是,目前尚不清楚这些措施在整个流域中的高流量和年流量变化很大的情况下对系统产生了什么影响。将生态系统的Ecopath与Ecosim模型拟合到可用数据,并用于预测在不同养分添加策略和不同年度流量方式下的生态系统结构和水库目标。该模型的结果表明,营养物的添加是系统中的重要驱动力,较低的流量会导致较高的营养水平而产生较高的生物量。决策分析表明,尽管在某些高流量的年份中损失了营养,但保持营养添加以实现管理目标的重要性。
更新日期:2021-05-07
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