Exploration of riffle-scale interactions between abiotic variables and microbial assemblages in the hyporheic zone

被引:18
作者
Sliva, L [1 ]
Williams, DD [1 ]
机构
[1] Univ Toronto, Dept Life Sci, Scarborough, ON M1C 1A4, Canada
关键词
D O I
10.1139/F04-190
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Molecular methods were applied to explore the composition of hyporheic bacterial assemblages and their possible interaction with interstitial physicochemical variables. Hyporheic flows on a riffle were manipulated (a downwelling zone was converted to an upwelling zone and vice versa) in order to examine the influence of vertical flow patterns on microbial assemblages. Bacterial assemblages were heterogeneously distributed throughout the riffle, the greatest similarity among them occurring at similar depths rather than in areas of similar flow regimes (upwelling versus downwelling). There was no correlation between the measured physicochemical variables and the microbial assemblages, with the exception of depth and sediment particle size. The flow manipulation in the original downwelling zone appeared to have had an effect on the microbial assemblages, although this influence may have been primarily due to a change in temperature in the manipulated region rather than an alteration of the vertical-flow direction per se.
引用
收藏
页码:276 / 290
页数:15
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