Seasonal and spatial comparisons of phytoplankton growth and mortality rates due to microzooplankton grazing in the northern South China Sea
Seasonal and spatial comparisons of phytoplankton growth and mortality rates due to microzooplankton grazing in the northern South China Sea
复制标题
南海北部微型浮游动物放牧引起的浮游植物生长和死亡率的季节和空间比较
DOI：
10.5194/bg-10-2775-2013
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发表时间：
2012-11
期刊：
影响因子：
4.9
通讯作者：
Liu, H.
中科院分区：
文献类型：
--
作者：
Chen, B.;Zheng, L.;Huang, B.;Song, S.;Liu, H.
采用海水稀释法，于2009年7 - 8月和2010年1月在南海北方表层和深层叶绿素最大值（DCM）层对微型浮游动物对浮游植物的摄食效应进行了综合调查。我们比较了浮游植物生长（mu（0））和微型浮游动物摄食率（m）的垂直（表面与DCM），空间（陆上与离岸）和季节（夏季与冬季）差异。在夏季，mu（0）和m显着高于在DCM层，这是低于混合层的表面。在冬季，表面mu（0）是显着高于DCM，而m是没有显着差异的两个层之间，这两个都是在混合层。表面积亩（0）是，平均而言，在夏季显着高于冬季，而平均表面积米是没有不同的两个季节之间。夏季和冬季表层沃茨均不存在mu（0）的跨陆架梯度。在表层沃茨中，mu（0）与环境硝酸盐浓度无关，营养盐富集对浮游植物生长的影响不明显。从陆架到流域表面沃茨的m在夏季有减小的趋势，但在冬季没有减小的趋势。夏季沃茨微型浮游动物的摄食对浮游植物的影响（m/mu（0））相对较小，表明此时微型浮游动物的摄食与浮游植物的生长脱钩。夏季和冬季微型浮游动物平均分别摄食初级生产力的73%和65%。
We conducted a comprehensive investigation on the microzooplankton herbivory effect on phytoplankton in the northern South China Sea (SCS) using the seawater dilution technique at surface and deep chlorophyll maximum (DCM) layers on two cruises (July-August of 2009 and January of 2010). We compared vertical (surface vs. DCM), spatial (onshore vs. offshore), and seasonal (summer vs. winter) differences of phytoplankton growth (mu(0)) and microzooplankton grazing rates (m). During summer, both mu(0) and m were significantly higher at the surface than at the DCM layer, which was below the mixed layer. During winter, surface mu(0) was significantly higher than at the DCM, while m was not significantly different between the two layers, both of which were within the mixed layer. Surface mu(0) was, on average, significantly higher in summer than in winter, while average surface m was not different between the two seasons. There were no cross-shelf gradients of mu(0) in summer or winter surface waters. In surface waters, mu(0) was not correlated with ambient nitrate concentrations, and the effect of nutrient enrichment on phytoplankton growth was not pronounced. There was a decreasing trend of m from shelf to basin surface waters in summer, but not in winter. Microzooplankton grazing effect on phytoplankton (m/mu(0)) was relatively small in the summer basin waters, indicating a decoupling of microzooplankton grazing and phytoplankton growth at this time. On average, microzooplankton grazed 73% and 65% of the daily primary production in summer and winter, respectively.
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影响因子：
1.6
作者：
R. Lewin
通讯作者：
R. Lewin
影响因子：
4.5
作者：
Landry, MR;Barber, RT;White, JR
通讯作者：
White, JR
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通讯作者：
E. Sherr;B. Sherr
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Bidigare, RR
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作者：
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通讯作者：
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