Metabarcoding Analyses and Seasonality of the Zooplankton Community at BATS
Metabarcoding Analyses and Seasonality of the Zooplankton Community at BATS
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DOI：
10.3389/fmars.2020.00173
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发表时间：
2020-03-24
影响因子：
3.7
通讯作者：
Blanco-Bercial, Leocadio
中科院分区：
文献类型：
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作者：
Blanco-Bercial, Leocadio
浮游动物群落的多样性和特定组成对生态系统服务（如碳输出）和海洋食物网结构有直接影响。在多样性高的地区，对整个群落的详细描述可能是一个障碍，阻碍了对这些过程和相互作用的完全理解。马尾藻海就是这样一个地区，那里的浮游动物多样性是世界海洋中最高的。因此，在百慕大大西洋时间序列研究地点，大多数研究都集中在浮游动物生物量或特定群体上。为了进一步了解BATS站点的群落组成，本研究利用18S V9高变区元条形码对浮游动物群落进行了研究。全年（2015年）的白天和夜间样本显示了昼夜垂直迁移的特征，这是由那些在元条形码读取中具有较高代表性的群体驱动的。平方根变换后的季节排序与温带相似，可以根据群落组成（春季开花后、夏季分层、秋季混合事件和冬季混合）区分四季，但与浮游动物生物量模式不对应。这种群落排序显示了与测量的垂直通量的相关性，强调了了解群落制度的必要性，即使在理论上稳定的区域，如少营养海洋，也需要进一步了解浮游动物介导的过程
The diversity and specific composition of zooplankton communities have a direct effect on the ecosystem services (e.g., carbon export) and structure of ocean food webs. In areas where diversity is high, a detailed characterization of the whole community can represent a hurdle that prevents a complete understanding of those processes and interactions. One such region is the Sargasso Sea, where zooplankton diversity is among the highest in the world oceans. As a consequence, at the Bermuda Atlantic Time-series Study location, most research has focused on zooplankton biomass or on particular groups. To provide new insight into the total community composition at the BATS site, in this study the zooplankton community is investigated by means of metabarcoding of the 18S V9 hypervariable region. Day and night samples from a full year (2015) show the signature of diel vertical migration, driven by those groups with a higher representation in the metabarcoding reads. Seasonal ordination was detected after square-root transformation and, similarly to temperate regions, four seasons could be differentiated based on community composition (post-spring bloom, summer stratification, fall mixing event, and winter mixing), with no correspondence with the zooplankton biomass patterns. This community ordination showed correlation with the measured vertical flux, highlighting the need of understanding community regimes, even in theoretically stable regions such as the oligotrophic ocean, to advance in our understanding of zooplankton-mediated processes