Sources and oxygen consumption of particulate organic matter settling in oyster aquaculture farms: Insights from analysis of fatty acid composition
Sources and oxygen consumption of particulate organic matter settling in oyster aquaculture farms: Insights from analysis of fatty acid composition
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DOI：
10.1016/j.ecss.2021.107328
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发表时间：
2021-03-31
影响因子：
2.8
通讯作者：
Sakamaki, Takashi
中科院分区：
文献类型：
--
作者：
Hatakeyama, Yuji;Kawahata, Tatsuya;Sakamaki, Takashi
研究了牡蛎养殖场沉降颗粒有机物（POM）及其潜在来源（悬浮POM、牡蛎生物沉积物、污损贻贝生物沉积物、附着在牡蛎和渔具上的POM）的脂肪酸组成和耗氧速率（OCR），并利用稳定同位素混合模型估算了它们对沉降POM的相对贡献。沉降POM的藻源脂肪酸含量和OCR均低于潜在来源。牡蛎养殖场内沉积POM的脂肪酸含量和OCR值均低于养殖场外。POC的沉降通量为2？牡蛎养殖场内部的氧气浓度是养殖场外部的18倍，据估计，沉积的POM在底层平均消耗的氧气是养殖场外部的5倍。牡蛎沉积物对养殖场内POM沉降的贡献与其他潜在来源相当。我们的研究强调，防止招募和从养殖生物和农场设施（如贻贝和微生物）中去除固着生物可能是减少农场内POM沉降量的有效策略。此外，我们表明，脂肪酸标志物将是一个很好的指标，用于预测各种POM源的耗氧潜力。
We investigated the composition of fatty acids and oxygen consumption rate (OCR) of the settling particulate organic matter (POM) and its potential sources (suspended POM, oyster biodeposits, fouling mussel biodeposits, POM attached on oysters and farm gears) in oyster farms, and estimated their relative contribution to the settling POM using a stable isotope mixing model. The settling POM was lower in both the content of algal-originating fatty acids and OCR compared with those of the potential sources. Furthermore, the content of fatty acids and OCR of settling POM were lower inside than outside the oyster farms. The settling flux of POC was 2?18 times higher inside than outside the oyster farms, with the settling POM estimated to consume on average 5 times more oxygen in the bottom layers. The contribution of oyster biodeposits to the settling POM inside the farms was equivalent to that of other potential sources. Our study highlighted that preventing recruitment and removing sessile organisms from the cultivated organisms and farm facilities such as mussels and microorganisms could be an effective strategy for reducing the amount of POM settling inside the farms. Furthermore, we showed that the fatty acids marker would be a good indicator for predicting the potential of oxygen consumption of various POM sources.