Microzooplankton grazing constrains pathways of carbon export in the subarctic North Pacific
Microzooplankton grazing constrains pathways of carbon export in the subarctic North Pacific
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微型浮游动物的放牧限制了北太平洋亚北极地区的碳输出途径
DOI：
10.1002/lno.11783
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发表时间：
2021
影响因子：
4.5
通讯作者：
S. Menden‐Deuer
中科院分区：
文献类型：
--
作者：
Heather Mcnair;F. Morison;Jason R. Graff;T. Rynearson;S. Menden‐Deuer
为了确定浮游植物丰度和大小结构的微型浮游动物放牧的影响，我们量化了浮游植物的生长和草食性放牧率在整个真光层和整个光梯度的北太平洋出口过程中的海洋遥感（出口）巡航附近的海洋站爸爸。在2018年8月和9月的30天连续拉格朗日观测期间，深度综合叶绿素a（Chl a）浓度稳定，平均为20 ± 2 mg m−2。瓶孵实验表明，即使浮游植物的生长速率在0到0.4 d−1之间变化，浮游植物的生长也会被微型浮游动物的摄食所平衡。微型浮游动物放牧引起浮游植物丰度下降，这是平衡的浮游植物细胞大小增加，导致一致的浮游植物生物量随着时间的推移。微型浮游动物以0.11 ± 0.17 d−1的平均速率捕食浮游植物，导致浮游植物的内在生长速率为-0.07 ± 0.26 d−1。放牧实验的预测股票密切一致（16%以内）与原位叶绿素a动态和浮游植物丰度，这表明浮游植物的主要损失过程是放牧的微型浮游动物，而不是物理混合或下沉的浮游植物。因此，微型浮游动物在调节初级生产者生物量和通过食物网转移颗粒有机碳方面发挥了关键作用，其中一部分可以作为食物网过程的副产品出口。
To identify the effect of microzooplankton grazing on phytoplankton abundance and size structure, we quantified phytoplankton growth and herbivorous grazing rates throughout the euphotic zone and across a light gradient on the North Pacific EXport Processes in the Ocean from RemoTe Sensing (EXPORTS) cruise near Ocean Station Papa. During 30 days of continuous, Lagrangian observation in August and September of 2018, depth integrated chlorophyll a (Chl a) concentrations were stable and averaged 20 ± 2 mg m−2. Bottle‐incubation experiments revealed that phytoplankton growth was balanced by microzooplankton grazing even when phytoplankton growth rates varied from 0 to 0.4 d−1 in response to light manipulation. Microzooplankton grazing caused a decline in phytoplankton abundance that was balanced by increased phytoplankton cell size resulting in consistent phytoplankton biomass over time. Microzooplankton grazed phytoplankton at an average rate of 0.11 ± 0.17 d−1 which lead to an intrinsic phytoplankton growth rate of −0.07 ± 0.26 d−1. Predicted stocks from grazing experiments aligned closely (within 16%) with in situ Chl a dynamics and phytoplankton abundance, suggesting that the dominant loss process of phytoplankton was grazing by microzooplankton rather than physical mixing or sinking of phytoplankton. Consequently, microzooplankton played a critical role in regulating primary producer biomass and in transferring particulate organic carbon through the food web where a fraction could then be exported as byproducts of food web processes.
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影响因子：
5.2
作者：
S. Henson;A. Yool;R. Sanders
通讯作者：
S. Henson;A. Yool;R. Sanders
影响因子：
3.7
作者：
T. Tanhua;S. Pouliquen;J. Hausman;K. O’brien;P. Bricher;Taco de Bruin;J. Buck;E. Burger;T. Carval;K. Casey;S. Diggs;A. Giorgetti;H. Glaves;V. Harscoat;D. Kinkade;J. Muelbert;A. Novellino;B. Pfeil;P. Pulsifer;A. P. van de Putte;E. Robinson;D. Schaap;A. Smirnov;N. Smith;D. Snowden;T. Spears;S. Stall;M. Tacoma;P. Thijsse;S. Tronstad;T. Vandenberghe;M. Wengren;L. Wyborn;Zhiming Zhao
通讯作者：
T. Tanhua;S. Pouliquen;J. Hausman;K. O’brien;P. Bricher;Taco de Bruin;J. Buck;E. Burger;T. Carval;K. Casey;S. Diggs;A. Giorgetti;H. Glaves;V. Harscoat;D. Kinkade;J. Muelbert;A. Novellino;B. Pfeil;P. Pulsifer;A. P. van de Putte;E. Robinson;D. Schaap;A. Smirnov;N. Smith;D. Snowden;T. Spears;S. Stall;M. Tacoma;P. Thijsse;S. Tronstad;T. Vandenberghe;M. Wengren;L. Wyborn;Zhiming Zhao
影响因子：
3.7
作者：
Morison, Francoise;Harvey, Elizabeth;Menden-Deuer, Susanne
通讯作者：
Menden-Deuer, Susanne
使用北大西洋海洋滑翔机的垂直辐照度和叶绿素剖面估算海洋初级生产。
影响因子：
11.4
作者：
Hemsley VS
通讯作者：
Hemsley VS