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RECORD NUMBER: 2 OF 6

OLS Field Name OLS Field Data
Main Title Biogeochemical Cycling of Organic Matter in Acidic Environments: Are Microbial Degradative Processes Adapted to Low pH.
Author Benner, R. ; Lewis, D. L. ; Hodson, R. E. ;
CORP Author Environmental Research Lab., Athens, GA. ;Georgia Univ., Athens.
Year Published 1987
Report Number EPA/600/D-87/176;
Stock Number PB87-195392
Additional Subjects Aquatic microbiology ; pH ; Plant ecology ; Decomposition ; Lignocellulose ; Acidification ; Vegetation ; Swamps ; Substrates ; Biodegradation ; Okefenokee Swamp(Georgia) ; Corkscrew Swamp(Florida)
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB87-195392 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 25p
Abstract
The rates of microbial degradation of a variety of dissolved and particulate substrates in water and sediment from the Okenofee Swamp, Georgia, and Corkscrew Swamp, Florida, are compared. These two wetland ecosystems share many of the same types of plant communities and both are peat-forming systems. As in many wetlands, streams, and small lakes, vascular plant detritus is a major source of organic matter in these two freshwater swamps. The relationship between pH and rates of biodegradation or organic substrates was determined for natural microbial assemblages and for several bacterial isolates from these environments. Results suggest that microbial degradative processes that rely on extracellular enzymes are depressed at low pHs, whereas the microbial utilization of low-molecular-weight compounds that can be directly transported into cells is not substantially affected by variations in pH from 4 to 8. Furthermore, microbial populations will not 'adapt' for the rapid utilization of lignocellulosic substrates at low pHs.