The protist community mirrors seasonality and mesoscale hydrographic features in the oligotrophic Sargasso Sea

The protist community mirrors seasonality and mesoscale hydrographic features in the oligotrophic Sargasso Sea
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原生生物群落反映了寡营养马尾藻海的季节性和中尺度水文特征

DOI:
10.22541/au.164131421.18822279/v1
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发表时间:
2022
期刊:
Croatian Journal of Fisheries
影响因子:
--
通讯作者:
R. Curry
R. Curry
中科院分区:
--
文献类型:
--
作者:
L. Blanco;R. Parsons;Luis M. Bolaños;Rod Johnson;S. Giovannoni;R. Curry

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原生生物代表了地球上真核生物多样性的大部分。 海洋.它们在海洋食物网中有着不同的功能, 在地球化学循环中的重要作用。与此同时, 数据是丰富的水平和时间的覆盖面,鲜为人知的是, 它们的垂直结构,特别是透光层以下。的 本研究将DNA元条形码应用于三年以上收集的样本, 结合最佳可行技术服务时间序列评估海洋原生生物 海洋上层和中层的海洋生物群落。原生生物 群落在上层表现出动态的季节性, 水文年周期混合营养谱系在整个 然而,自养生物在快速过渡期间开花, 冬季混合与夏季分层之间的关系, 在夏末达到顶峰,当温跃层的底部 到达最深处透光层以下是社区, 以Rhizaria为主,具有一定的深度分层性, 全年,反映当地水文和生物 氧气最少区等特征。结果表明, 水体的分区,其中生态位的垂直位置, 每个群落全年都在变化,可能取决于营养物质 可用性、混合层深度和其他水文特征。 最后,原生生物群落密切关注中尺度事件 (漩涡),那里的社区反映了水文隆起, 将更深的群落抬高数百米, 楼上的社区。
Protists represent the majority of the eukaryotic diversity in the oceans. They have different functions in the marine food web, playing essential roles in the biogeochemical cycles. Meanwhile the available data is rich in horizontal and temporal coverage, little is known on their vertical structuring, particularly below the photic zone. The present study applies DNA metabarcoding to samples collected over three years in conjunction with the BATS time-series to assess marine protist communities in the epipelagic and mesopelagic zones. The protist community showed a dynamic seasonality in the epipelagic, responding to hydrographic yearly cycles. Mixotrophic lineages dominated throughout the year; however, autotrophs bloomed during the rapid transition between the winter mixing and the stratified summer, and heterotrophs had their peak at the end of summer, when the base of the thermocline reaches its deepest depth. Below the photic zone, the community, dominated by Rhizaria, is depth-stratified and relatively constant throughout the year, mirroring local hydrographic and biological features such as the oxygen minimum zone. The results suggest a dynamic partitioning of the water column, where the niche vertical position for each community changes throughout the year, likely depending on nutrient availability, the mixed layer depth, and other hydrographic features. Finally, the protist community closely followed mesoscale events (eddies), where the communities mirrored the hydrographic uplift, raising the deeper communities for hundreds of meters, and compressing the communities above.
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