Detecting the presence of fish farm-derived organic matter at the seafloor using stable isotope analysis of phospholipid fatty acids.
Detecting the presence of fish farm-derived organic matter at the seafloor using stable isotope analysis of phospholipid fatty acids.
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DOI：
10.1038/s41598-017-05252-w
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发表时间：
2017-07-11
影响因子：
4.6
通讯作者：
Thornton B
中科院分区：
文献类型：
--
作者：
Mayor DJ;Gray NB;Hattich GSI;Thornton B
扩大全球水产养殖活动在就业和粮食安全方面对子孙后代的福祉至关重要。在开放式交换笼中饲养动物允许释放有机废物，其中一些最终到达底层沉积物。因此，发展快速、定量和客观的监测技术对水产养殖业的环境可持续增长至关重要。在这里，我们证明了通过量化沉积物磷脂脂肪酸（PLFAs）及其碳稳定同位素特征，可以很容易地在海底检测到养鱼场产生的有机废物。对五个农场的观察表明，农场的规模和/或距离会影响所产生的有机废物的空间分布及其对底栖细菌生物量的影响。与鱼饲料来源PLFAs的同位素特征比较表明，16:0和18:1（n-9）是鱼养殖场来源有机废物的潜在生物标志物。我们的研究结果表明，沉积物PLFAs的稳定同位素分析具有监测水产养殖活动环境绩效的潜力，特别是考虑到水产养殖饲料中陆源有机质的日益普遍，因为它是同位素区域到海洋有机质。
The expansion of global aquaculture activities is important for the wellbeing of future generations in terms of employment and food security. Rearing animals in open-exchange cages permits the release of organic wastes, some of which ultimately reaches the underlying sediments. The development of rapid, quantitative and objective monitoring techniques is therefore central to the environmentally sustainable growth of the aquaculture industry. Here, we demonstrate that fish farm-derived organic wastes can be readily detected at the seafloor by quantifying sediment phospholipid fatty acids (PLFAs) and their carbon stable isotope signatures. Observations across five farms reveal that farm size and/or distance away from it influence the spatial distribution of the generated organic wastes and their effect on benthic bacterial biomass. Comparison to the isotopic signatures of fish feed-derived PLFAs indicates that 16:0 and 18:1(n-9) are potential biomarkers for fish farm-derived organic wastes. Our results suggest that stable isotope analysis of sediment PLFAs has potential for monitoring the environmental performance of aquaculture activities, particularly given the increasing prevalence of terrigenous organic matter in aquaculture feed stocks because it is isotopically district to marine organic matter.
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