A Large-Scale Comparison of Factors Influencing Phytoplankton Abundance in Rivers, Lakes, and Impoundments.
A Large-Scale Comparison of Factors Influencing Phytoplankton Abundance in Rivers, Lakes, and Impoundments.
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DOI：
10.2307/1939885
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发表时间：
1987-12
期刊：
影响因子：
4.8
通讯作者：
D. Søballe;B. L. Kimmel
中科院分区：
文献类型：
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作者：
D. Søballe;B. L. Kimmel
我们分析了两个大型数据集（国家河流水质核算网络和国家富营养化调查），定量比较河流，河流蓄水池和天然湖泊的生态结构和功能。采用物理化学变量的判别分析将这三种类型的水生系统沿着与水停留时间（r = 0.7）、流域面积（r = 0.7）、水深（r = 0.6）、溪流流量（r = 0.6）和水透明度（r = 0.4）相关的复合梯度分开。天然湖泊和河流占据了这一梯度的两端，水库，平均而言，是中间的，但天然湖泊和蓄水池广泛重叠，并没有形成一个有用的二分法。回归分析表明，单位磷藻类丰度的大小顺序为：河流<水库<天然湖泊，这与藻类在水体中停留时间的组间差异无关。藻类丰度每单位磷没有显着差异，这三个系统类型之间的系统具有相似的停留时间进行比较。我们的研究结果表明，水停留时间是一个有用的系统级指标，具有类似的生态影响的河流，湖泊和水库。
We analyzed two large data sets (the National Stream Water Quality Accounting Network and the National Eutrophication Survey) to compare quantitatively the ecological structure and function of rivers, river impoundments, and natural lakes on a broad scale. Discriminant analysis with physical-chemical variables separated these three types of aquatic systems along a composite gradient that correlated with water residence time (r = 0.7), drainage area (r = 0.7), water depth (r = 0.6), stream flow (r = 0.6), and water clarity (r = 0.4). Natural lakes and rivers occupied opposite ends of this gradient, and reservoirs, on average, were intermediate, but natural lakes and impoundments overlapped extensively and did not form a useful dichotomy. Regression analysis showed algal abundance per unit phosphorus increasing in the sequence: rivers < impoundments < natural lakes, which paralleled intergroup differences in residence time. Algal abundance per unit phosphorus did not differ significantly among these three system types when systems with similar residence times were compared. Our results indicate that water residence time is a useful system-level index that has similar ecological implications for rivers, lakes, and reservoirs.