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首页> 外文期刊>Estuarine Coastal and Shelf Science >Estimating nitrogen loading and far-field dispersal potential from background sources and coastal finfish aquaculture: A simple framework and case study in Atlantic Canada
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Estimating nitrogen loading and far-field dispersal potential from background sources and coastal finfish aquaculture: A simple framework and case study in Atlantic Canada

机译：估计背景源和沿海有鳍鱼类水产养殖的氮负荷和远场扩散潜力：加拿大大西洋的简单框架和案例研究

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Far-field nutrient impacts associated with finfish aquaculture have been identified as a topic of concern for regulators, managers, scientists, and the public for over two decades but disentangling aquaculture impacts from those caused by other natural and anthropogenic sources has impeded the development of monitoring metrics and management plans. We apply a bulk, steady-state nitrogen loading model (NLM) framework to estimate the annual input of Total Dissolved Nitrogen (TDN) from point and non-point sources to the watershed surrounding Port Mouton Bay, Nova Scotia (Canada). We then use the results of the NLM together with estimates of dissolved inorganic nitrogen (DIN) loading from a sea-cage trout farm in the Bay and progressive vector diagrams to illustrate potential patterns of DIN dispersal from the trout farm. Our estimated anthropogenic nitrogen contribution to Port Mouton Bay from all terrestrial and atmospheric sources is similar to 211,703 kg TDN/year with atmospheric deposition accounting for almost all (98.6%). At a stocking level of similar to 400,000 rainbow trout, the Port Mouton Bay sea-cage farm increases the annual anthropogenic TDN loading to the bay by 14.4% or 30,400 kg. Depending on current flow rates, nitrogen flux from the trout farm can be more than double the background concentrations of TDN near the farm site. Although it is unlikely that nitrogen loading from this single fish farm is saturating the DIN requirements of the entire bay, progressive vector diagrams suggest that the dispersal potential may be insufficient to mitigate potential symptoms of eutrophication associated with nitrogen fluxes. We present an accessible and user-friendly tool for managers to estimate baseline nutrient loading in relation to aquaculture and our use of progressive vector diagrams illustrate a practical and simple method for characterizing potential nutrient dispersal based on local conditions and spatial scales. Our study joins numerous studies which have highlighted the need for more effective monitoring and assessment methods to improve the detection of aquaculture effects at far-field scales and to assess those effects in relation to other natural and anthropogenic factors impacting coastal habitats. (C) 2018 Elsevier Ltd. All rights reserved.
机译：与鱼类养殖有关的远场养分影响已被监管者，管理人员，科学家和公众关注了二十多年，但将水产养殖影响与其他自然和人为来源造成的影响相分离却阻碍了监测工作的发展。指标和管理计划。我们应用大量稳态氮负荷模型（NLM）框架来估算从点源和非点源到加拿大新斯科舍省Mouton湾周围流域的总溶解氮（TDN）的年输入量。然后，我们使用NLM的结果，以及海湾中一个网箱鳟鱼养殖场中溶解无机氮（DIN）负荷的估算值和渐进矢量图来说明从鳟鱼养殖场中DIN扩散的潜在模式。我们估计，所有陆地和大气源对木桐湾的人为氮贡献量均约为211,703千克TDN /年，其中大气沉积几乎占所有（98.6％）。木桐港湾海sea养殖场的存货水平接近40万只虹鳟，使人为海湾的人为TDN年度装载量增加了14.4％或30,400公斤。根据当前的流量，鳟鱼养殖场的氮通量可能是养殖场附近的TDN背景浓度的两倍以上。尽管单个养鱼场的氮负荷不可能满足整个海湾的DIN要求，但渐进矢量图表明，分散势可能不足以缓解与氮通量相关的富营养化潜在症状。我们为管理人员提供了一种易于使用且易于使用的工具，以供管理人员估算与水产养殖有关的基线养分含量，而我们使用的渐进矢量图说明了一种根据当地条件和空间规模表征潜在养分分布的实用而简单的方法。我们的研究与众多研究相结合，这些研究都强调需要更有效的监测和评估方法，以改善对远场规模的水产养殖影响的检测，并评估与影响沿海生境的其他自然和人为因素相关的影响。 （C）2018 Elsevier Ltd.保留所有权利。

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