Pelagic Sargassum events in Jamaica: Provenance, morphotype abundance, and influence of sample processing on biochemical composition of the biomass.
Pelagic Sargassum events in Jamaica: Provenance, morphotype abundance, and influence of sample processing on biochemical composition of the biomass.
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牙买加的远洋马尾藻事件：来源、形态类型丰度以及样品处理对生物量生化成分的影响。
DOI：
10.1016/j.scitotenv.2021.152761
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Machado CB
中科院分区：
文献类型：
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作者：
Machado CB
几个世纪以来，北大西洋的马尾藻海中就有浮游马尾藻物种。2011年，一个新的区域集中了这些褐藻的高生物量，开始在热带大西洋发展。从那时起，在加勒比海和西非海岸报告了大规模和经常性的马尾藻通量。这些海藻事件对沿海生态系统和近岸海洋生物有重大的负面影响，并影响到社会经济部门，包括公共卫生、沿海生活、旅游业、渔业和海上运输。尽管最近的进展，在forecastofSargassumevents，和阐明的海藻组合物，许多知识差距仍然存在，包括形态型丰度duringSargassumevents，漂流的海藻在搁浅前几个月，和影响的样品处理方法对生物量的生化组成。我们使用2020年夏天在牙买加海岸收获的海藻观察到，S.在不同的时间和采样地点，flutansIII是最丰富的形态型。没有明显的差异，在地理起源，或出处，thesargaramats观察。大多数从牙买加北部和南部返回的Sargentrum在搁浅前经历了大约27 °C的环境温度和34-36 psu的盐度。我们还表明，便宜的（太阳）相比，昂贵的（冷冻）干燥技术影响生物质的生化组成。晒干增加了酚类化合物的比例，但对岩藻黄质含量和单糖的数量有不利影响，除了甘露醇。岩藻糖硫酸多糖的含量的影响取决于其提取方法，并在灰分，蛋白质和脂肪酸含量的变化有限，在大多数调查的样品位置。这些观察结果对于生物质在其价值稳定的背景下的储存和运输是重要的。
PelagicSargassumspecies have been known for centuries in the Sargasso Sea of the North Atlantic Ocean. In 2011, a new area concentrating high biomass of these brown algae started developing in the Tropical Atlantic Ocean. Since then, massive and recurrentSargassuminfluxes have been reported in the Caribbean and off the coast of Western Africa. TheseSargassumevents have a major negative impact on coastal ecosystems and nearshore marine life, and affect socio-economic sectors, including public health, coastal living, tourism, fisheries, and maritime transport. Despite recent advances in the forecasting ofSargassumevents, and elucidation of the seaweed composition, many knowledge gaps remain, including morphotype abundance duringSargassumevents, drift of the seaweeds in the months prior to stranding, and influence of sample processing methods on biomass biochemical composition. Using seaweeds harvested on the coasts of Jamaica in summer of 2020, we observed thatS. fluitansIII was the most abundant morphotype at different times and sampling locations. No clear difference in the geographical origin, or provenance, of theSargassummats was observed. The majority ofSargassumbacktracked from both north and south of Jamaica experienced ambient temperatures of around 27 °C and salinity in the range of 34–36 psu before stranding. We also showed that cheap (sun) compared to expensive (freeze) drying techniques influence the biochemical composition of biomass. Sun-drying increased the proportion of phenolic compounds, but had a deleterious impact on fucoxanthin content and on the quantities of monosaccharides, except for mannitol. Effects on the content of fucose containing sulfated polysaccharides depended on the method used for their extraction, and limited variation was observed in ash, protein, and fatty acid content within most of the sample locations investigated. These observations are important for the storage and transport of the biomass in the context of its valorisation.