Publication Date:
2022-05-25
Description:
Author Posting. © American Society for Microbiology, 2004. This article is posted here by permission of American Society for Microbiology for personal use, not for redistribution. The definitive version was published in Applied and Environmental Microbiology 70 (2004): 6230-6239, doi:10.1128/AEM.70.10.6230-6239.2004.
Description:
The occurrence and distribution of magnetotactic bacteria (MB) were studied as a function of the physical and chemical conditions in meromictic Salt Pond, Falmouth, Mass., throughout summer 2002. Three dominant MB morphotypes were observed to occur within the chemocline. Small microaerophilic magnetite-producing cocci were present at the top of the chemocline, while a greigite-producing packet-forming bacterium occurred at the base of the chemocline. The distributions of these groups displayed sharp changes in abundance over small length scales within the water column as well as strong seasonal fluctuations in population abundance. We identified a novel, greigite-producing rod in the sulfidic hypolimnion that was present in relatively constant abundance over the course of the season. This rod is the first MB that appears to belong to the {gamma}-Proteobacteria, which may suggest an iron- rather than sulfur-based respiratory metabolism. Its distribution and phylogenetic identity suggest that an alternative model for the ecological and physiological role of magnetotaxis is needed for greigite-producing MB.
Description:
This work was partially funded by a grant from the Woods Hole
Oceanographic Institution Reinhart Coastal Research Center to S.L.S.
and K.J.E. S.L.S. was supported by a National Defense Science and
Engineering graduate fellowship. D.A.B. was supported by National
Science Foundation grant EAR-0311950 and National Aeronautics
and Space Administration (NASA) Johnson Space Center grant NAG 9-1115.
Keywords:
Magnetotactic bacteria (MB)
;
{gamma}-Proteobacteria
Repository Name:
Woods Hole Open Access Server
Type:
Article
Format:
543767 bytes
Format:
application/pdf
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