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Appl Environ Microbiol. 1985 February; 49(2): 408-412
Copyright © 1985, American Society for Microbiology. All Rights Reserved.

Microcalorimetric Approach to Determine Relationships between Energy Supply and Metabolism in River Epilithon

Maurice A. Lock* and Timothy E. Ford

School of Animal Biology, University College of North Wales, Bangor, Gwynedd LL57 2UW, United Kingdom

ABSTRACT

In a study to determine the relative importance of various apparent molecular weight fractions to the metabolism (heat output) of attached microorganisms in rivers, a marked lack of response to gross changes in the external organic matter supply was noted over the course of several hours. Such a response by a mixed autotrophic-heterotrophic community could be attributed to the autotrophs being the sole organic energy source for the heterotrophs. However, substantial metabolic activities were noted in attached microbial communities grown in darkness (algae free), thus indicating that riverborne organic matter was a major energy source. This paradox was attributed to a proposed lag in the availability of dissolved and colloidal organic matter to the heterotrophic microorganisms.

FOOTNOTES

* Corresponding author.

Appl Environ Microbiol. 1985 February; 49(2): 408-412
Copyright © 1985, American Society for Microbiology. All Rights Reserved.





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