NDLI: Influence of Dissolved Organic Matter and Invertebrates on the Function of Microbial Films in Groundwater

Content Provider	Springer Nature Link
Author	Cooney, Timothy J. Simon, Kevin S.
Copyright Year	2009
Abstract	Microbial films play a central role in mediating energy flux in groundwater ecosystems. The activity of these microbes is likely to be influenced by the availability of resources, especially dissolved organic matter (DOM), and also by consumers, such as invertebrates that feed on microbial films. We used microcosm experiments to examine how bacterial production and extracellular enzyme activity on rocks and fine sediments from cave streams responded to amendments of DOM of varying form and to cave amphipods (Gammarus minus) that feed on microbial films. Glucose and mixtures of DOM extracted from soils and leaves stimulated bacterial production on rocks by 89–166% relative to unamended controls. In contrast, tannic acid amendment did not influence production. Microbial films on fine sediment were not consistently responsive to DOM amendment. Glucose amendment led to increased activity of enzymes associated with C acquisition, but other forms of DOM generally did not alter enzyme activity. DOM amendment led to removal of nitrate and this was correlated with bacterial production, suggesting microbes can link carbon and nitrogen cycling in groundwater as is the case in surface systems. Amphipods reduced bacterial production on rocks, but not fine sediments. The reduction caused by amphipods offset the stimulatory effect of glucose amendment, but there was no interactive effect of DOM and grazing on bacterial production or enzyme activity. Both resources and consumers play important roles in regulating microbial activity in groundwater with important implications for higher trophic levels that use microbes for food.
Starting Page	599
Ending Page	610
Page Count	12
File Format	PDF
ISSN	00953628
Journal	Microbial Ecology
Volume Number	58
Issue Number	3
e-ISSN	1432184X
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-05-15
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Nature Conservation Geoecology/Natural Processes Microbial Ecology Ecology Microbiology
Content Type	Text
Resource Type	Article
Subject	Soil Science Ecology Ecology, Evolution, Behavior and Systematics

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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