作为全球扰动实验网络的水产养殖业

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2024-04-15 DOI:10.1002/lol2.10384
Jemma M. Fadum, Ed K. Hall, Elena Litchman, Emily J. Zakem
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The continued pursuit of a sustainable future for aquaculture is critical not only to meet global food demands, but also to support local economies and communities. Though by no means a silver bullet for solving systematic inequities, aquaculture can play a critical role in improving public health and well-being by increasing access to nutrition (Gephart et al. <span>2021</span>), providing employment opportunities, especially for women (Gopal et al. <span>2020</span>), and contributing to sustainable development overall (Subasinghe et al. <span>2009</span>). In terms of the United Nation's Sustainable Development Goals (SDGs), truly sustainable aquaculture (i.e., continued production in farms that do not adversely alter the ecosystem they inhabit) is well suited to tackling several of the 17 goals, including Zero Hunger (SDG 2) (Stead <span>2019</span>) and those related to economic opportunities, particularly zero poverty, and good jobs and economic growth (SDGs 1 and 8, respectively), as well as many of the targets and related indicators associated with the SDGs (Griffin et al. <span>2019</span>).</p><p>In addition to the above costs and benefits, we posit that global-scale aquaculture operations constitute an untapped research opportunity that goes beyond the study of environmental impacts of aquaculture and the development of more sustainable methods. We propose that aquaculture operations, in particular cage culture farms, act as perturbation experiments and are therefore well suited for fundamental research in ecology, biogeochemistry, limnology, and oceanography (among other fields). In the following sections we explore this “aquaculture as perturbation experiments” framework. We first identify the elements of cage culture farms that make them good candidates for replicable, global-scale perturbation experiment-based research. We then explore potential research opportunities enabled by the framework to advance our understanding of ecosystem and community ecology, global biogeochemical cycling, and carbon sequestration.</p><p>Mechanisms of eutrophication as well as the eutrophying effects of aquaculture have been well documented (Gowen <span>1994</span>; Smith and Schindler <span>2009</span>, among others), even where top sustainability certifications have been achieved (Amundsen et al. <span>2019</span>; Fadum and Hall <span>2022</span>). Eutrophication is driven by the increased nutrient loading (carbon, phosphorus, nitrogen, and micronutrients) from mineralized constituents of organic matter (i.e., uneaten feed pellets and fecal matter) as well as N-rich gill excretion. Operations supporting year-round, multi-year production effectively act as a press experiment (rather than the alternative “pulse” method of nutrient enrichment experiments). This press experiment gradually applies both organic matter (OM) and nutrient loading stress which potentially drives an ecosystem closer to a regime shift. The causal relationship between increased nutrient availability and/or the alleviation of nutrient limitation and accelerated primary productivity has been well established. However, with the exception of large-scale experiments such as those done in the Experimental Lakes Area (Emmerton <span>2015</span>), opportunities to assess such regime shift thresholds and the cascading effects of eutrophication in situ and at an ecosystem scale are rare. This is partially due to a paucity of eutrophic systems with continuous datasets, which span the years of nutrient additions. Furthermore, considering aquaculture as a global perturbation experiment provides a unique opportunity to understand the impacts and implications of ecosystem disturbance at a scale, which would be otherwise unfeasible (given the quantity of additions needed to achieve a given threshold) or environmentally irresponsible or unethical (such as induced eutrophication). The proposed “aquaculture as perturbation experiments” framework applies the concept of learning from ecosystem manipulation and broadens the scale at which we can pursue fundamental ecological questions. 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The continued pursuit of a sustainable future for aquaculture is critical not only to meet global food demands, but also to support local economies and communities. Though by no means a silver bullet for solving systematic inequities, aquaculture can play a critical role in improving public health and well-being by increasing access to nutrition (Gephart et al. <span>2021</span>), providing employment opportunities, especially for women (Gopal et al. <span>2020</span>), and contributing to sustainable development overall (Subasinghe et al. <span>2009</span>). In terms of the United Nation's Sustainable Development Goals (SDGs), truly sustainable aquaculture (i.e., continued production in farms that do not adversely alter the ecosystem they inhabit) is well suited to tackling several of the 17 goals, including Zero Hunger (SDG 2) (Stead <span>2019</span>) and those related to economic opportunities, particularly zero poverty, and good jobs and economic growth (SDGs 1 and 8, respectively), as well as many of the targets and related indicators associated with the SDGs (Griffin et al. <span>2019</span>).</p><p>In addition to the above costs and benefits, we posit that global-scale aquaculture operations constitute an untapped research opportunity that goes beyond the study of environmental impacts of aquaculture and the development of more sustainable methods. 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This press experiment gradually applies both organic matter (OM) and nutrient loading stress which potentially drives an ecosystem closer to a regime shift. The causal relationship between increased nutrient availability and/or the alleviation of nutrient limitation and accelerated primary productivity has been well established. However, with the exception of large-scale experiments such as those done in the Experimental Lakes Area (Emmerton <span>2015</span>), opportunities to assess such regime shift thresholds and the cascading effects of eutrophication in situ and at an ecosystem scale are rare. This is partially due to a paucity of eutrophic systems with continuous datasets, which span the years of nutrient additions. 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引用次数: 0

摘要

科学意义声明水产养殖是一项全球性产业,它使周围的水生环境富含营养物质,即碳、氮和磷。由于这些营养物质的输入在空间和时间上都是明确的,因此网箱养殖场可作为扰动实验来了解营养物质富集对水生生态系统的生态影响。各个养殖场组成了一个现有的全球实验网络,虽然利用率不高,但已建立了对生态系统影响指标的持续监测。该网络覆盖淡水和海洋环境,横跨多个环境梯度。我们认为,这一全球网络为更好地了解当前全球其他变化背景下不同水生生态系统对营养富集的反应提供了机会。通过加强数据共享和跨学科合作,现有的全球扰动实验网络将提供一个机会,从根本上了解生态系统对营养物质富集的不同反应。
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The aquaculture industry as a global network of perturbation experiments

The industrial production of finfish (e.g., salmon, tilapia, and carp) has well documented ecological consequences (Ottinger et al. 2016; Carballeira Braña et al. 2021). Negative impacts of the aquaculture industry include excessive nutrient loading (Islam 2005) and subsequent eutrophication, disease introduction (Kennedy et al. 2016), heavy metals pollution (Emenike et al. 2022), and the assimilation of escapee fish into wild populations (Toledo-Guedes et al. 2014). Despite ecological concerns, the aquaculture industry has continued to grow in recent decades (Naylor et al. 2021, FAO 2022), driven by increasing market demands and rapidly declining wild fisheries. The continued pursuit of a sustainable future for aquaculture is critical not only to meet global food demands, but also to support local economies and communities. Though by no means a silver bullet for solving systematic inequities, aquaculture can play a critical role in improving public health and well-being by increasing access to nutrition (Gephart et al. 2021), providing employment opportunities, especially for women (Gopal et al. 2020), and contributing to sustainable development overall (Subasinghe et al. 2009). In terms of the United Nation's Sustainable Development Goals (SDGs), truly sustainable aquaculture (i.e., continued production in farms that do not adversely alter the ecosystem they inhabit) is well suited to tackling several of the 17 goals, including Zero Hunger (SDG 2) (Stead 2019) and those related to economic opportunities, particularly zero poverty, and good jobs and economic growth (SDGs 1 and 8, respectively), as well as many of the targets and related indicators associated with the SDGs (Griffin et al. 2019).

In addition to the above costs and benefits, we posit that global-scale aquaculture operations constitute an untapped research opportunity that goes beyond the study of environmental impacts of aquaculture and the development of more sustainable methods. We propose that aquaculture operations, in particular cage culture farms, act as perturbation experiments and are therefore well suited for fundamental research in ecology, biogeochemistry, limnology, and oceanography (among other fields). In the following sections we explore this “aquaculture as perturbation experiments” framework. We first identify the elements of cage culture farms that make them good candidates for replicable, global-scale perturbation experiment-based research. We then explore potential research opportunities enabled by the framework to advance our understanding of ecosystem and community ecology, global biogeochemical cycling, and carbon sequestration.

Mechanisms of eutrophication as well as the eutrophying effects of aquaculture have been well documented (Gowen 1994; Smith and Schindler 2009, among others), even where top sustainability certifications have been achieved (Amundsen et al. 2019; Fadum and Hall 2022). Eutrophication is driven by the increased nutrient loading (carbon, phosphorus, nitrogen, and micronutrients) from mineralized constituents of organic matter (i.e., uneaten feed pellets and fecal matter) as well as N-rich gill excretion. Operations supporting year-round, multi-year production effectively act as a press experiment (rather than the alternative “pulse” method of nutrient enrichment experiments). This press experiment gradually applies both organic matter (OM) and nutrient loading stress which potentially drives an ecosystem closer to a regime shift. The causal relationship between increased nutrient availability and/or the alleviation of nutrient limitation and accelerated primary productivity has been well established. However, with the exception of large-scale experiments such as those done in the Experimental Lakes Area (Emmerton 2015), opportunities to assess such regime shift thresholds and the cascading effects of eutrophication in situ and at an ecosystem scale are rare. This is partially due to a paucity of eutrophic systems with continuous datasets, which span the years of nutrient additions. Furthermore, considering aquaculture as a global perturbation experiment provides a unique opportunity to understand the impacts and implications of ecosystem disturbance at a scale, which would be otherwise unfeasible (given the quantity of additions needed to achieve a given threshold) or environmentally irresponsible or unethical (such as induced eutrophication). The proposed “aquaculture as perturbation experiments” framework applies the concept of learning from ecosystem manipulation and broadens the scale at which we can pursue fundamental ecological questions. Below, we identify three research opportunities aimed at developing a deeper mechanistic understanding of ecosystem response to anthropogenic OM and nutrient loading stress more broadly.

Interdisciplinary collaboration between the aquaculture industry, researchers studying the impacts of aquaculture, and scientists pursuing fundamental research in fields such as biogeochemistry and ecology will help to illuminate how anthropogenic disturbance interfaces with the varied and pressing impacts of global change. In addition to OM and nutrient loading, other inputs from aquaculture farms such as heavy metals which are introduced through antifouling agents and formulated feed (Emenike et al. 2022), microplastics from farming equipment (Chen et al. 2021), antibiotics (Pepi and Focardi 2021; Adenaya et al. 2023), pathogens (Ahne et al. 1989), and contaminants of emerging concern (Ahmad et al. 2022) could similarly be used to investigate other types of anthropogenic disturbance in aquatic ecosystems. In recommending such research, we acknowledge two simultaneous positions: that the aquaculture industry, even within highly accredited operations, is often unsustainable and that it provides a research opportunity. Aquaculture is an environmental sustainability challenge, a means of meeting sustainable development goals, and also a research platform. The proposed “aquaculture as perturbation experiments” framework has the potential to dramatically improve our understanding of OM and nutrient enrichment in aquatic ecosystems at the global scale.

None declared.

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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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