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首页> 外文期刊>Marine ecology progress series >Temporal and vertical variability in picophytoplankton primary productivity in the North Pacific Subtropical Gyre
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Temporal and vertical variability in picophytoplankton primary productivity in the North Pacific Subtropical Gyre

机译：北太平洋亚热带回旋区浮游植物初级生产力的时间和垂直变化

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摘要

Picophytoplankton (<= 3 mu m) are major contributors to plankton biomass and primary productivity in the subtropical oceans. We examined vertical and temporal variability of picophytoplankton primary productivity at near-monthly time scales (May 2012-May 2013) in the North Pacific Subtropical Gyre (NPSG) based on filter size-fractionated and flow cytometric sorting of radiolabeled (C-14) pico plankton cells. Primary productivity by picophytoplankton comprised similar to 68 to 83% of total (> 0.2 mu m) particulate C-14-based productivity, and was lowest be tween September and December and highest between March and August. Group-specific rates of production by Pro chlorococcus, Synechococcus, and photosynthetic pico eukaryotes (PPE) averaged similar to 39, similar to 2, and similar to 11% of the total C-14-productivity, respectively. Average cell-specific rates of production by PPE (15.2 fmol C cell(-1) d(-1)) were 25-to 90-fold greater than Prochlorococcus (0.36 fmol C cell(-1) d(-1)) and Synechococcus (1.56 fmol C cell(-1) d(-1)). Prochlorococcus dominated (61-78%) the summed picophytoplankton biomass, while PPE and Synechococcus contributed 21-36% and 2-8%, respectively. Rates of production normalized to biomass were nearly equivalent amongst Prochlorococcus, Synechococcus, and PPE, averaging 0.6, 0.5, and 0.4 d(-1), respectively. Over our study period, Prochlorococcus and PPE production varied 4-to 5-fold, while biomass varied similar to 3-fold. In contrast, Synechococcus production varied similar to 30-fold, with peak rates in March 2013 accompanied by similar to 13-fold increase in biomass. Combined, our results provide evidence for rapid growth by picophytoplankton in this persistently low-nutrient ecosystem, highlighting the importance of cell loss processes responsible for mediating organic matter cycling in the euphotic zone of the NPSG.
机译：浮游植物（<= 3微米）是亚热带海洋浮游生物量和初级生产力的主要贡献者。我们基于过滤器大小分级和流式细胞仪对放射性标记的（C-14）皮克进行了分类，研究了北太平洋亚热带环流（NPSG）在近月时间尺度（2012年5月至2013年5月）皮克浮游植物初级生产力的垂直和时间变化。浮游生物细胞。浮游植物的初级生产力占基于C-14的总颗粒（> 0.2微米）的生产力的68％至83％，在9月和12月之间最低，在3月至8月之间最高。原球菌，球菌和光合微微真核生物（PPE）的特定组生产率平均分别接近39％，接近2％和接近总C-14生产率的11％。 PPE（15.2 fmol C细胞（-1）d（-1））的平均细胞比生产率比原球菌（0.36 fmol C细胞（-1）d（-1））高25-90倍球菌（1.56 fmol C细胞（-1）d（-1））。原球菌占浮游生物总生物量的61-78％，而PPE和聚球菌分别占21-36％和2-8％。以生物量标准化的生产速率在原球菌，球菌和PPE中几乎相等，分别为0.6、0.5和0.4 d（-1）。在我们的研究期间，Prochlorococcus和PPE的产量变化为4至5倍，而生物量的变化接近3倍。相反，合成球菌的产量变化接近30倍，2013年3月达到峰值，同时生物量增加了13倍。结合起来，我们的结果提供了在这个持续低营养的生态系统中浮游植物快速生长的证据，突显了负责介导NPSG富营养区有机物质循环的细胞损失过程的重要性。

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