How biofilm clusters affect substrate flux and ecological selection

被引：23

作者：

Rittmann, BE ^{[1
]}

Pettis, M ^{[1
]}

Reeves, HW ^{[1
]}

Stahl, DA ^{[1
]}

机构：

[1] Northwestern Univ, Dept Civil Engn, Evanston, IL 60208 USA

来源：

WATER SCIENCE AND TECHNOLOGY | 1999年 / 39卷 / 07期

关键词：

biofilm; channels; clusters; coexistence; competition; diffusion; mass transport; microbial ecology;

D O I：

10.2166/wst.1999.0337

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We use three-dimensional mathematical modeling to represent key substrate phenomena in a prototypical cluster-and-channel biofilm. Clusters are represented as cylinders in which diffusion and reaction occur simultaneously. The geometry of the effective diffusion layer surrounding the cluster is manipulated to simulate different degrees of advection within the channels. The cluster-and-channel configuration can increase the average substrate flux per substratum area only if the channels have advection and the surface coverage is high enough. The modeling also suggests that sub-cluster niches for slower growing species, such as nitrifiers, are reduced in size when substrate penetrates the cluster from all sides. Thus, the cluster-and-channel configuration might create a competitive disadvantage for slow-growing species. (C) 1999 IAWQ Published by Elsevier Science Ltd. All rights reserved.

引用

页码：99 / 105

页数：7

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