Multifaceted impacts of the stony coral Porites astreoides on picoplankton abundance and community composition
Multifaceted impacts of the stony coral Porites astreoides on picoplankton abundance and community composition
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石珊瑚滨珊瑚对超微型浮游生物丰度和群落组成的多方面影响
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
A. Apprill
中科院分区：
文献类型：
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作者：
Sean P. McNally;R. Parsons;A. Santoro;A. Apprill
微型浮游生物促进营养物质在贫营养沃茨中的基本循环，维持珊瑚礁生态系统。尽管如此，关于珊瑚与浮游细菌和古生菌（微型浮游生物）之间的特定相互作用如何促进营养动态和珊瑚礁生产力的数据仍然很少。在这里，我们利用围隔实验来研究珊瑚和珊瑚粘液如何影响珊瑚礁沃茨中的微型浮游生物和营养物质。在12天内，我们使用直接细胞计数，SSU rRNA基因测序和基于荧光原位杂交的优势谱系丰度，在存在或不存在Porites astreoides珊瑚和粘液添加的情况下，跟踪营养浓度，picoplancouver丰度和picoplancouver的分类组成。我们的研究结果表明，当珊瑚存在时，聚球藻，SAR 11和红球藻科细胞被优先删除。当珊瑚被移除时，它们的分泌物促进了各种微型浮游生物的生长，包括SAR11和杜鹃藻科。硝酸盐浓度增加了7倍，可能是由珊瑚全生物体内的氮矿化（氨化作用与硝化作用耦合）引起的，可能进一步促进了这些类群的生长。与此相反，粘液的加入导致了总picoplankton和Rhodocellaceae的快速初始增长，但没有可测量的整体群落结构的变化。这项研究提供了证据的多方面影响的珊瑚picoplancouver，其中珊瑚holobiont选择性地删除和促进不同的picoplancouver和refereralizes氮的增长。
Picoplankton foster essential recycling of nutrients in the oligotrophic waters sustaining coral reef ecosystems. Despite this fact, there is a paucity of data on how the specific interactions between corals and planktonic bacteria and archaea (picoplankton) contribute to nutrient dynamics and reef productivity. Here, we utilized mesocosm experiments to investigate how corals and coral mucus influence picoplankton and nutrients in reef waters. Over 12 days, we tracked nutrient concentrations, picoplankton abundances and taxonomic composition of picoplankton using direct cell‐counts, sequencing of SSU rRNA genes and fluorescent in situ hybridization‐based abundances of dominant lineages in the presence or absence of Porites astreoides corals and with mucus additions. Our results demonstrate that when corals are present, Synechococcus, SAR11 and Rhodobacteraceae cells are preferentially removed. When corals were removed, their exudates enhanced the growth of diverse picoplankton, including SAR11 and Rhodobacteraceae. A seven‐fold increase in nitrate concentration, possibly caused by nitrogen remineralization (ammonification coupled to nitrification) within the coral holobiont, may have further facilitated the growth of these taxa. In contrast, the addition of mucus resulted in rapid initial growth of total picoplankton and Rhodobacteraceae, but no measurable change in overall community structure. This study presents evidence of the multifaceted influences of corals on picoplankton, in which the coral holobiont selectively removes and promotes the growth of diverse picoplankton and remineralizes nitrogen.