Bere T, Tundisi J G
Instituto Internacional de Ecologia, São Carlos, SP, Brasil.
Braz J Biol. 2010 Nov;70(4):920-30. doi: 10.1590/s1519-69842010000500002.
Epipsammic diatoms have important implications for ecosystem processes in lotic environments. Most of the studies on benthic diatoms concentrate on epilithic diatoms and very little is known about epipsammic diatoms. The objective of this study was to assess epipsammic diatom communities in streams in relation to environmental conditions. Epipsammic diatoms and water quality sampling was done at 7 sites during summer base flow period (2008). Forward stepwise multiple regression and canonical correspondence analysis (CCA) were used to determine environmental gradients along which species vary with physical and chemical variables. A total of 112 diatom species distributed among 44 genera were recorded. Altitude and the process of eutrophication played a significant role in structuring diatom communities in the study region.
附沙硅藻对流水环境中的生态系统过程具有重要意义。大多数关于底栖硅藻的研究都集中在附石硅藻上，而对附沙硅藻的了解却非常少。本研究的目的是评估溪流中附沙硅藻群落与环境条件的关系。在夏季基流期（2008年），于7个地点采集了附沙硅藻和水质样本。采用向前逐步多元回归和典范对应分析（CCA）来确定物种随物理和化学变量变化的环境梯度。共记录了分布在44个属中的112种硅藻。海拔高度和富营养化过程在构建研究区域的硅藻群落中发挥了重要作用。
