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Applied and Environmental Microbiology, February 2009, p. 1058-1064, Vol. 75, No. 4
0099-2240/09/$08.00+0 doi:10.1128/AEM.01725-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.



Department of Civil and Environmental Engineering, University of Wisconsin—Madison,1 Microbiology Doctoral Training Program, University of Wisconsin—Madison, Madison, Wisconsin2
Received 26 July 2008/ Accepted 18 December 2008
Bacterial community dynamics in South End tidal creek, Sapelo Island, GA, were studied over a 74-h, five-tidal-cycle period. Observations were made hourly for the first consecutive 24 hours, every 3 hours on the second day, and every 6 hours on the third day. Tide most strongly influenced bacterial community composition (high-tide versus low-tide community analysis of similarities, R = 0.41, P < 0.03). Dissolved oxygen concentration and conductivity were important proximate drivers. However, after accounting for tide and environmental variables colinear with tide, cumulative time became more important in describing community variation. In-stream physical processes, including particulate suspension and sedimentation, may explain tide-associated trends in the bacterial community composition observed.
Published ahead of print on 29 December 2008.
These authors contributed equally to this work.
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