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首页> 外文期刊>Journal of oceanography >Seasonal variability of phytoplankton community structure in the subtropical western North Pacific
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Seasonal variability of phytoplankton community structure in the subtropical western North Pacific

机译：北太平洋亚热带西部浮游植物群落结构的季节性变化

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During 2010–2012 in the northwestern region of the North Pacific subtropical gyre, we examined seasonal variability of the phytoplankton community with respect to structure and photo-physiological status using the chemotaxonomy program CHEMTAX and fast-repetition-rate fluorometry. Total chlorophyll a standing stock in the upper 150?m (?TChl a) varied from 25.5 to 89.0?mg?m?2 during periods of relatively deep vertical mixing (40–207?m), but was fairly constant (18.6–27.2?mg?m?2) during stratification periods. Prymnesiophytes, chlorophytes, chrysophytes, prasinophytes, and/or diatoms comprised major portions of the ?TChl a during mixing periods. Diatoms became the most abundant group (29–43?%) in February 2011, when large phytoplankton blooms were observed, whereas Prochlorococcus was the dominant component (15–46?%) during stratification periods. During mixing periods, nitrate and nitrite (NO3?+?NO2) concentrations occasionally exceeded 0.5?μmol?kg?1 in surface waters, and Fv/Fm (photochemical efficiency of photosystem II) ranged from approximately 0.40–0.50 within the euphotic zone. During stratification periods, however, NO3?+?NO2 concentrations were very low (<0.1?μmol?kg?1) from the surface to 50–95?m, and Fv/Fm was in the range of 0.25–0.40 in the upper mixed layer. The seasonal variability of phytoplankton community structure in this region was related to the nutrient supply from deep waters. Additionally, we compared our data to published values at the time-series station ALOHA, located in the eastern region of the NPSG. At Sta. ALOHA in 2011, ?TChl a was almost constant (19.5–26.4?mg?m?2) throughout the year and was consistently dominated by Prochlorococcus (61–81?%). These results suggest that the phytoplankton community in the northwestern region of the NPSG is seasonally variable and composed of diverse groups compared with the eastern region of the NPSG.
机译：在2010-2012年期间，我们使用化学分类学程序CHEMTAX和快速重复速率荧光法研究了北太平洋亚热带回旋区的西北地区，浮游植物群落在结构和光生理状况方面的季节性变化。在相对较深的垂直混合期间（40–207？m），上部150？m（？TChl a）中的总叶绿素a静存量从25.5到89.0？mg？m？2，但相当恒定（18.6–27.2） ？mg？m？2）。在混合期间，早生植物，绿藻类，绿藻类，古植物和/或硅藻构成了ΔTChla的主要部分。 2011年2月，当观察到大量浮游植物开花时，硅藻成为最丰富的类群（29-43％），而在分层期中，原球藻是主要成分（15-46％）。在混合期间，地表水中的硝酸盐和亚硝酸盐（NO3 ++ NO2）的浓度偶尔超过0.5？μmol？kg？1，在富营养区内Fv / Fm（光系统II的光化学效率）约为0.40-0.50。然而，在分层期间，从表层到50–95？m的NO3？+？NO2浓度非常低（<0.1？μmol？kg？1），并且上部的Fv / Fm在0.25–0.40的范围内混合层。该区域浮游植物群落结构的季节性变化与深水养分供应有关。此外，我们将数据与位于NPSG东部地区的时间序列站ALOHA的发布值进行了比较。在Sta。在2011年的ALOHA中，全年的？TChl a几乎恒定（19.5–26.4？mg？m？2），并始终以原球菌为主（61–81％）。这些结果表明，与NPSG东部地区相比，NPSG西北地区的浮游植物群落是季节性变化的，并且由不同的群体组成。

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