Cascading Trophic Interactions in Lake Ecosystems: Effects  on Bacteria and Their Consumers
{'Code': '08010208', 'Directorate': {'Abbreviation': 'BIO', 'LongName': 'Direct For Biological Sciences'}, 'Division': {'Abbreviation': 'DEB', 'LongName': 'Division Of Environmental Biology'}}
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Heterotrophic microorganisms process a substantial portion                 of the primary production of aquatic ecosystems.  This research                 will examine how food web interactions control microbial                        productivity.  Whole lake experiments are being conducted at the                University of Notre Dame Environmental Research Center that                     manipulate fish populations that in turn modify the planktonic                  food web.  This project will study the response of the                          heterotrophic microbial community.  The effect of planned                       manipulations will be to decrease zooplankton biomass and                       increase phytoplankton biomass and productivity.  It is                         hypothesized that bacteria, protozoa, bacterial production, and                 grazing on bacteria will all increase in response to these                      manipulations.  The enhanced microbial activity in the                          manipulated lakes will also lead to higher rates of total water                 column respiration.  Measurements of the biomass, productivity,                 grazing by heterotrophic microbes as well as community                          respiration will be made to test these hypotheses at the                        ecosystem scale.  The direct and indirect effects of the food web               on heterotrophic microbes will be further examined in enclosure                 experiments and modeling studies.                                                    Results from this study will likely be of major significance               in terms of the basic understanding of the biotic dynamics of                   lakes and may be applicable to new strategies for lake                          management.
{'FirstName': 'Michael', 'LastName': 'Pace', 'PI_MID_INIT': 'L', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Michael L Pace', 'EmailAddress': 'pacem@virginia.edu', 'NSF_ID': '000244962', 'StartDate': '08/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
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[{'Code': '1128', 'Text': 'Population & Community Ecology'}, {'Code': '1129', 'Text': 'LONG-TERM PROJCTS IN ENVIR BIO'}]
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