The influence of climate on phytoplankton community biomass in San Francisco Bay Estuary
The influence of climate on phytoplankton community biomass in San Francisco Bay Estuary
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气候对旧金山湾河口浮游植物群落生物量的影响
DOI：
10.4319/lo.2000.45.3.0580
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Author P. W. Lehman
中科院分区：
文献类型：
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作者：
Author P. W. Lehman
在弗朗西斯科湾河口北方的浮游植物群落内的生物量的分布受到环境条件的影响，导致1975年和1993年之间的年代际气候制度转变。1975-1989年期间硅藻生物量的百分比下降，这是由于硅藻减少和绿色和蓝色绿色藻类和鞭毛虫物种生物量增加造成的。在硅藻中，羽状硅藻的损失比中心硅藻大。气候变化对浮游植物群落生物量的直接作用是使用与气候相关的环境变化来确定的，该环境变化是使用加州气候指数与一系列物理和化学变量之间的协方差从总环境变化中分离出来的，并通过主成分分析进行总结。气候相关的环境变化与浮游植物物种和物种群生物量之间的显着相关性表明气候与浮游植物群落生物量分布之间存在联系。对控制气候相关环境变化与浮游植物群落生物量之间关联的可能机制的进一步分析证实了水温、电导率和水透明度对羽纹硅藻生物量的重要性。自然和人为过程的比较表明，硅藻生物量在每个站的环境条件的影响，即使总硅藻生物量在河口引水的强烈影响。
The distribution of biomass within the phytoplankton community in northern San Francisco Bay Estuary was influenced by environmental conditions resulting from an interdecadal climate regime shift between 1975 and 1993. A decrease in percentage of diatom biovolume characterized the period 1975–1989 and was caused by both a decrease in diatom and an increase in green and bluegreen algae and flagellate species biovolume. Among the diatoms, there was a greater loss of pennate than centric diatoms. The direct role of climate variation on phytoplankton community biovolume was determined using climatically‐related environmental variation that was isolated from the total environmental variation using the covariance between a California climate index and a suite of physical and chemical variables and summarized by principal component analysis. Significant correlation between climatically‐related environmental variation and phytoplankton species and species group biovolume suggested a link between climate and the distribution of biovolume in the phytoplankton community. Further analysis of the possible mechanisms controlling the association between climatically‐related environmental variation and phytoplankton community biovolume confirmed the importance of water temperature, specific conductance, and water transparency to pennate diatom biovolume. Comparison of natural and anthropogenic processes indicated that diatom biovolume at each station was influenced by environmental conditions even though total diatom biovolume in the estuary was strongly influenced by water diversion.