Geometric stoichiometry model yields relevant insights for assessing nutrient-related environmental impacts of aquaculture.

IF 2.5 3区 环境科学与生态学 Q2 BIODIVERSITY CONSERVATION
Conservation Physiology Pub Date : 2025-09-15 eCollection Date: 2025-01-01 DOI:10.1093/conphys/coaf066
Sowdamini Sesha Prasad, Duncan D Cameron, Chris G Carter, Andrea Williamson, Julia L Blanchard
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Abstract

Aquaculture plays a crucial role in global food security and is being increasingly used to aid species and ecosystem conservation. However, concerns over environmental impact of aquaculture expansion are driving research into ecosystem approaches to aquaculture. Ecosystem approaches to aquaculture require understanding of the relationship between aquafeeds and aquaculture species to maximize consumer growth, quantify elemental flow of nutrients and minimize waste output. Conventional bioenergetic models typically assume fixed elemental ratios to quantify metabolic processes and do not consider an organism's nutrient demand. A new bridging framework, Geometric Stoichiometry (GS), unifies nutritional geometry and ecological stoichiometry disciplines using macromolecules as currencies and dietary regulation to balance nutrient deficits and excesses by the consumer. We present the first application of the GS framework to aquaculture by investigating how different formulated feed ingredients affect intakes to maintain C:N homeostasis, growth and waste output using three opportunistic datasets for an emerging aquaculture species, slipper lobster (Thenus australiensis). Our GS model results indicate that protein sources and their inclusion levels drive the most variation in feed intake and growth. It also predicts highest nitrogenous waste for fish meal and lowest for squid by-product meal feeds. Our results highlight the need for targeted experiments to further refine the GS model to help support environmental management and formulate low-impact feeds for aquaculture.

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几何化学计量模型为评估水产养殖的营养相关环境影响提供了相关见解。
水产养殖在全球粮食安全中发挥着至关重要的作用,并越来越多地用于帮助物种和生态系统保护。然而,对水产养殖扩张对环境影响的担忧正在推动对水产养殖生态系统方法的研究。水产养殖的生态系统方法需要了解水产饲料和水产养殖物种之间的关系,以最大限度地提高消费者增长,量化营养元素流动并最大限度地减少废物产出。传统的生物能量模型通常假设固定的元素比例来量化代谢过程,而不考虑生物体的营养需求。一个新的桥梁框架,几何化学计量学(GS),将营养几何和生态化学计量学学科结合起来,使用大分子作为货币和饮食调节来平衡消费者的营养缺乏和过剩。我们首次将GS框架应用于水产养殖,通过使用三个机会性数据集,研究了不同配方饲料成分如何影响摄取量,以维持C:N稳态、生长和废物输出,研究了新兴水产养殖物种——澳洲滑龙虾(Thenus australiensis)。我们的GS模型结果表明,蛋白质来源及其包涵水平对采食量和生长的影响最大。它还预测鱼粉的氮浪费最高,鱿鱼副产品粉饲料的氮浪费最低。我们的研究结果表明,需要进行有针对性的实验,进一步完善GS模型,以帮助支持环境管理和制定低影响的水产养殖饲料。
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来源期刊
Conservation Physiology
Conservation Physiology Environmental Science-Management, Monitoring, Policy and Law
CiteScore
5.10
自引率
3.70%
发文量
71
审稿时长
11 weeks
期刊介绍: Conservation Physiology is an online only, fully open access journal published on behalf of the Society for Experimental Biology. Biodiversity across the globe faces a growing number of threats associated with human activities. Conservation Physiology will publish research on all taxa (microbes, plants and animals) focused on understanding and predicting how organisms, populations, ecosystems and natural resources respond to environmental change and stressors. Physiology is considered in the broadest possible terms to include functional and mechanistic responses at all scales. We also welcome research towards developing and refining strategies to rebuild populations, restore ecosystems, inform conservation policy, and manage living resources. We define conservation physiology broadly and encourage potential authors to contact the editorial team if they have any questions regarding the remit of the journal.
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