Responses of epilimnetic phytoplankton to experimental nutrient enrichment in three small seepage lakes
Responses of epilimnetic phytoplankton to experimental nutrient enrichment in three small seepage lakes
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DOI：
10.1093/plankt/20.10.1889
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发表时间：
1998-10-01
影响因子：
2.1
通讯作者：
St Amand, AL
中科院分区：
文献类型：
--
作者：
Cottingham, KL;Carpenter, SR;St Amand, AL
本文介绍了三个epilimnetic浮游植物群落实验氮和磷富集的响应相比，浮游植物群落在第四，未经处理，湖。增加营养投入增加浮游植物生物量，初级生产力，绿藻，隐藻和物种周转率在所有三个丰富的湖泊，蓝藻增加了两个丰富的湖泊。然而，营养物质的添加也导致以前占优势的甲藻和金藻以及物种多样性的下降。在物种水平上，有很大的变化，从一年到一年的丰富和参考湖泊的群落组成，这表明浮游植物群落组成是高度动态的，即使在没有富集。总体而言，总生物量，生产力和物种多样性的变化是一致的富集湖泊之间，而物种组成的变化不同，由于在物理，化学和生物环境的变化，每个湖泊。这表明，聚集变量是更有用的定量预测营养的影响，而物种的反应，可以用来信号质量的湖泊之间的环境条件的差异。
This paper describes the responses of three epilimnetic phytoplankton communities to experimental nitrogen and phosphorus enrichment as compared to the phytoplankton community in a fourth, unmanipulated, lake. Increased nutrient inputs increased total phytoplankton biomass, primary productivity, chlorophytes, cryptomonads and species turnover rates in all three enriched lakes; cyanobacteria increased in two of the three enriched lakes. However, nutrient addition also led to declines in previously dominant dinoflagellates and chrysophytes, and in species diversity. At the species level, there were large changes in community composition from year to year in both enriched and reference lakes, suggesting that phytoplankton community composition is highly dynamic even in the absence of enrichment. Overall, changes in total biomass, productivity and species diversity were consistent among the enriched lakes, while changes in species composition differed due to variation in the physical, chemical and biotic environment of each lake. This suggests that aggregated variates are more useful for quantitative prediction of nutrient effects, while species responses can be used to signal qualitative differences in environmental conditions among lakes.