Effects of spatial scale on assessments of suspension bivalve aquaculture for productivity and environmental impacts
Effects of spatial scale on assessments of suspension bivalve aquaculture for productivity and environmental impacts
复制标题
空间尺度对双壳类悬浮养殖生产力和环境影响评估的影响
DOI：
10.1016/j.aquaculture.2022.738082
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发表时间：
2022
期刊：
影响因子：
4.5
通讯作者：
Nishimura Osamu
中科院分区：
文献类型：
--
作者：
Sakamaki Takashi;Zheng Yizhe;Hatakeyama Yuji;Fujibayashi Megumu;Nishimura Osamu
对双壳类水产养殖的生产力和环境影响进行适当评价是实现沿海海洋系统可持续经营的必要条件。使用完全混合的单箱模型估算有机质预算提供了一种简单的方法，帮助环境管理和水产养殖渔业的利益相关者获得水产养殖与环境之间相互作用的概述。然而，由于水产养殖设施和生态系统结构的分布具有空间异质性，估算和解释高度依赖于评估的空间尺度。本研究的目的是探讨悬浮牡蛎养殖中颗粒有机质（POM）预算的空间尺度如何影响对特定地点食物供应的解释以及牡蛎生物沉积对当地底层环境的影响。基于日本东北沿海温带海湾牡蛎养殖场的实际分布，在0.5 m ~ 4000 m的空间尺度上，估算了牡蛎的食物供给/需求（S/D）以及牡蛎生物沉积对海湾POM总沉积（Brel）的相对贡献。虽然研究湾有养殖牡蛎食物限制的报道，但在空间尺度梯度上S/ d大于1（范围为16 ~ 154）。由于完全混合的一箱模式的性质，S/在< 200 m和100 ~ 1400 m范围内倾向于相对较高和高估，但在中尺度相对较低。在农场或较小尺度（例如，1 < 100 m）， breli的评估值较高，而在较大尺度（例如，在100 ~ 500 m尺度上，breli的评估值<0.2）相对较低。基于模型计算，认为inS/ dda在空间尺度梯度上的变化格局具有普适性；然而，hs / d值相对较低的尺度取决于现场的具体条件，包括初级生产力和当前速度。我们的研究结果表明，需要仔细解释POM的估计预算，考虑模型假设以及评估的空间尺度的影响。
Proper evaluations of productivity and environmental impacts of bivalve aquaculture are necessary to achieve sustainable operations in coastal marine systems. Estimation of organic matter budgets using completely mixed one-box models provides an easy approach to help stakeholders of environmental management and aquaculture fisheries obtain an overview of the interactions between aquaculture and the environment. However, estimations and interpretations are highly dependent on the spatial scale of assessments because the distributions of aquaculture facilities and ecosystem structures are spatially heterogeneous. The objective of the present study was to examine how the spatial scale of assessments for the budgets of particulate organic matter (POM) affects the interpretation of the site-specific food supply for suspension oyster aquaculture and impacts of oyster biodeposition on local bottom environments. Based on the actual distribution of oyster farms in a temperate bay on the northeast coast of Japan, we estimated [food supply]/[food demand] (S/D) for oysters as well as the relative contribution of oyster biodeposition to the total deposition of POM (Brel) in the bay along a gradient of spatial scaleslfrom 0.5 m to 4000 m. Although food limitation for aquaculture oysters has been reported in the study bay,S/Dwas greater than 1 (ranging from 16 to 154) over the spatial scale gradient.S/Dtended to be relatively high and overestimated forl< 200 m andl> 1400 m due to the nature of completely mixed one-box models, but relatively lower at intermediate scales.Brelwas higher in assessments at farms or smaller scales (e.g.,l< 100 m) and was relatively lower at larger scales (e.g., <0.2 at the scale of >500 m). Based on our model-based calculations, the patterns of variation inS/Dalong the spatial scale gradient are considered to be universal; however, the scale at whichS/Dvalues are relatively low varies depending on site-specific conditions, including primary productivity and current velocity. Our findings suggest that estimated budgets of POM need to be carefully interpreted, accounting for model assumptions as well as the influence of the spatial scale of assessments.