Formation of 30- to 40-micrometer-thick laminations by high-speed marine bacteria in microbial mats.

Applied and Environmental Microbiology
G M Barbara, J G Mitchell

Abstract

The precision with which motile heterotrophic bacteria could position themselves in microbial mats was determined. This required the development of a technique to view motile bacteria in situ. This was successfully achieved by replacing a 1-cm-diameter minicore from the mat sediment with 210- to 300-(mu)m-diameter glass beads or sieved agar. After allowing 3 days for regrowth of the mat into the transparent medium, a cross section showed that bacteria formed a layer as thin as 30 to 40 (mu)m at a depth of 500 (mu)m below the surface. Bacterial concentrations in this microlamination were 20 times above background. Mean speeds were 200 (mu)m s(sup-1) inside and 60 (mu)m s(sup-1) outside the microlamination. The percentages of bacteria turning per 30 s were 93% inside and 10% outside the microlamination. Artificial chemical gradients were unsuccessful in stimulating microlamination formation or in eliciting the same extent of speed and turning responses. The significance of the results is that it is now possible to microscopically examine sedimentary bacteria in situ. Our first examination indicates that some bacteria form chemotactic microlaminations by increasing their turning frequency. This behavior is opposite that described ...Continue Reading

References

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Citations

Jul 8, 2005·Applied and Environmental Microbiology·Roland Thar, Tom Fenchel
May 1, 2003·FEMS Microbiology Ecology·Greg M Barbara, James G Mitchell
Feb 1, 2003·FEMS Microbiology Ecology·Greg M Barbara, James G Mitchell
Jul 23, 2013·PloS One·Karina M WinnJames G Mitchell
May 2, 2000·Applied and Environmental Microbiology·R TharM Kühl
Oct 1, 2008·Biological Reviews of the Cambridge Philosophical Society·Tom Fenchel, Bland Finlay
Sep 7, 2001·Annual Review of Microbiology·H N Schulz, B B Jorgensen
Jan 20, 2006·FEMS Microbiology Ecology·James G Mitchell, Kazuhiro Kogure
Jun 27, 2001·Applied and Environmental Microbiology·R Thar, T Fenchel
Aug 19, 2016·Journal of the Royal Society, Interface·Maya Bar DolevIdo Braslavsky

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