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Applied and Environmental Microbiology
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General Microbial Ecology

Influence of Macrophyte Decomposition on Growth Rate and Community Structure of Okefenokee Swamp Bacterioplankton

Robert E. Murray, Robert E. Hodson
Robert E. Murray
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Robert E. Hodson
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ABSTRACT

Dissolved substances released during decomposition of the white water lily (Nymphaea odorata) can alter the growth rate of Okefenokee Swamp bacterioplankton. In microcosm experiments dissolved compounds released from senescent Nymphaea leaves caused a transient reduction in the abundance and activity of water column bacterioplankton, followed by a period of intense bacterial growth. Rates of [3H]thymidine incorporation and turnover of dissolved d-glucose were depressed by over 85%, 3 h after the addition of Nymphaea leachates to microcosms containing Okefenokee Swamp water. Bacterial activity subsequently recovered; after 20 h [3H]thymidine incorporation in leachate-treated microcosms was 10-fold greater than that in control microcosms. The recovery of activity was due to a shift in the composition of the bacterial population toward resistance to the inhibitory compounds present in Nymphaea leachates. Inhibitory compounds released during the decomposition of aquatic macrophytes thus act as selective agents which alter the community structure of the bacterial population with respect to leachate resistance. Soluble compounds derived from macrophyte decomposition influence the rate of bacterial secondary production and the availability of microbial biomass to microconsumers.

FOOTNOTES

  • ↵* Corresponding author.

  • ↵‡ Present address: Department of Biology, Montana State University, Bozeman, MT 59717.

  • ↵† Okefenokee Ecosystem Publication no. 62.

  • Copyright © 1986, American Society for Microbiology
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Influence of Macrophyte Decomposition on Growth Rate and Community Structure of Okefenokee Swamp Bacterioplankton
Robert E. Murray, Robert E. Hodson
Applied and Environmental Microbiology Feb 1986, 51 (2) 293-301; DOI:

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Influence of Macrophyte Decomposition on Growth Rate and Community Structure of Okefenokee Swamp Bacterioplankton
Robert E. Murray, Robert E. Hodson
Applied and Environmental Microbiology Feb 1986, 51 (2) 293-301; DOI:
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