Temporal changes in the composition and biomass of beached pelagic Sargassum species in the Mexican Caribbean
Temporal changes in the composition and biomass of beached pelagic Sargassum species in the Mexican Caribbean
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DOI：
10.1016/j.aquabot.2020.103275
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发表时间：
2020-10-01
期刊：
影响因子：
1.8
通讯作者：
van Tussenbroek, Brigitta I.
中科院分区：
文献类型：
--
作者：
Garcia-Sanchez, Marta;Graham, Caroline;van Tussenbroek, Brigitta I.
自2011年以来，异常大量的浮游性Sargassum fluitans和S。在一些非洲国家和大加勒比地区，浮游生物（马尾藻）一直被冲上沿着，影响着生态系统和经济。我们估计了2016年9月至2020年5月抵达墨西哥加勒比海岸的马尾藻的生物量和组成。2016年，海滩上的群众包括S。natans VIII和S.弗卢坦斯三世S.在整个研究期间，flutans III是主要形式，平均占总湿生物量的> 60%。S.从2016年到2019年，natans VIII在时间上有所下降（41%至3%），尽管它在2020年的前几个月再次流行。第三形态S. natans I直到2018年2月才登记，其相对丰度从2018年的23%增加到2019年的31%。在墨西哥的马尾藻种类和搁浅的马尾藻的形态类型的初始组成不同于通常报道的马尾藻海。搁浅的马尾藻的总生物量在不同年份和季节之间变化很大，在2018年和2019年的夏季达到峰值。生物量的季节性变化可解释为：（1）尤卡坦海流中的马尾藻和（2）盛行信风。这项研究是关于西加勒比海搁浅马尾藻生物量和物种组成的第一份报告，可能有助于了解大量涌入的模式;这将有助于管理这种新现象。
Since 2011, unusually large quantities of pelagic Sargassum fluitans and S. natans (sargasso) have been washing ashore along the coasts of some African countries and the Greater Caribbean, impacting ecosystems and economies. We estimated biomass and composition of sargasso arriving to a Mexican Caribbean coast from September 2016 until May 2020. In 2016, the beached masses comprised S. natans VIII and S. fluitans III. S. fluitans III was the predominant form throughout the study period, comprising on average > 60 % of total wet biomass. The relative abundance of S. natans VIII decreased in time from 2016 to 2019 (41 to 3 %), although it became prevalent again in the first months of 2020. The third morphological form, S. natans I, was not registered until February 2018, and its relative abundance increased from 23 % in 2018 to 31 % in 2019. The initial composition of Sargassum species and morphotypes of the beached sargasso in Mexico differed from that commonly reported in the Sargasso Sea. The total biomass of beached sargasso varied considerably among years and seasons, with peaks during the summer months of 2018 and 2019. Seasonal variations in biomass were explained by 1) presence of sargasso in the Yucatan Current and 2) prevailing trade winds. This study is the first report on biomass and species composition of beached sargasso in the Western Caribbean and may help to understand patterns of the massive influxes; which will aid in the management of this new phenomenon.