Long lag times and high velocities in the motility of natural assemblages of marine bacteria.

Applied and Environmental Microbiology
J G MitchellR Paxinos

Abstract

The motility characteristics of natural assemblages of coastal marine bacteria were examined. Initially, less than 10% of the bacteria were motile. A single addition of tryptic soy broth caused an increase in the motile fraction of cells but only after 7 to 12 h. Motility peaked at 15 to 30 h, when more than 80% of cells were motile. These results support the proposal that energy limits motility in the marine environment. Cell speeds changed more than an order of magnitude on timescales of milliseconds and hours. The maximum community speed was 144 (mu)m s(sup-1), and the maximum individual burst velocity was 407 (mu)m s(sup-1). In uniform medium, speed was an inverse function of tryptic soy broth concentration, declining linearly over 0.001 to 1.0%. In media where concentration gradients existed, the mean speed was a function of position in a spatial gradient, changing from 69 to 144 (mu)m s(sup-1) over as little as 15 to 30 (mu)m. The results suggest that marine bacteria are capable of previously undescribed quick shifts in speed that may permit the bacteria to rapidly detect and keep up with positional changes in small nutrient sources. These high speeds and quick shifts may reflect the requirements for useful motility in a ...Continue Reading

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Citations

Sep 7, 2001·Annual Review of Microbiology·H N Schulz, B B Jorgensen
Feb 5, 2005·Applied and Environmental Microbiology·Carsten Matz, Klaus Jürgens
May 1, 2003·FEMS Microbiology Ecology·Greg M Barbara, James G Mitchell
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Jan 24, 2016·Proceedings of the National Academy of Sciences of the United States of America·Steven SmrigaRoman Stocker
Jul 31, 2002·Applied and Environmental Microbiology·Thomas KiørboeKam Tang
Jan 20, 2006·FEMS Microbiology Ecology·James G Mitchell, Kazuhiro Kogure
Apr 6, 2006·Oecologia·André W Visser, Thomas Kiørboe
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