Labile Dissolved Organic Matter In Riverine Saltmarsh       Estuaries: Origins and Biological Utilization
{'Code': '08010208', 'Directorate': {'Abbreviation': 'BIO', 'LongName': 'Direct For Biological Sciences'}, 'Division': {'Abbreviation': 'DEB', 'LongName': 'Division Of Environmental Biology'}}
{'SignBlockName': 'Crystal Blackshear', 'PO_EMAI': None, 'PO_PHON': None}
The biological utilization will be measured and the origins                will be identified for dissolved organic matter (DOM) fueling                   microbial metabolism in riverine saltmarsh estuaries.  Because                  most heterotrophic activity in estuaries is bacterial in origin,                this research will focus on sources of DOM used by bacteria in                  order to elucidate a major pathway of energy use in coastal                     ecosystems.  Stable isotope signals will be utilized to identify                the ultimate source of DOM used by bacteria, tracing organic                    matter flow from riverine, saltmarsh, and phytoplankton sources                 of DOM that have distinct stable isotopic compositions.  To trace               DOM use, a bioassay has been developed that involves growth of                  natural bacteria in filtered water coupled with subsequent                      determination of the delta 13C value of bacterial biomass, and in               some cases, delta 15N.  The isotopic measurements will indicate                 the source of DOM utilized.  Bacterial growth rates and yields in               the bioassay indicate the nutritional quality and quantity of the               labile substrate source.  Experiments will be extended throughout               an annual cycle in the Parker River of northern Massachusetts to                determine the isotopic composition of estuarine DOM that is                     ultimately derived from phytoplankton, Spartina, and upland                     plants, and to document the relationships between these sources                 of organic matter and bacterial growth via stable isotopic tracer               measurements.  Additional experiments will be conducted in a                    broad suite of other estuarine systems with substantially                       different presumptive sources of organic carbon in order to                     broaden the comparison and generalize the research results.                                                                                                     The research group for this project is excellent.  Facilities for               the research are first class.  Productive collaborations will be                pursued.                                                                                                                                                        Practically, the research will provide information pertinent to                 the understanding of biological productivity of estuaries.  Such                estuaries are often characterized is the fragile nurseries for                  the commercial fishing industry.
[{'FirstName': 'Brian', 'LastName': 'Fry', 'PI_MID_INIT': None, 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Brian Fry', 'EmailAddress': 'bfry@lsu.edu', 'NSF_ID': '000356925', 'StartDate': '08/01/1988', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}, {'FirstName': 'Bruce', 'LastName': 'Peterson', 'PI_MID_INIT': 'J', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Bruce J Peterson', 'EmailAddress': 'peterson@mbl.edu', 'NSF_ID': '000112150', 'StartDate': '08/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}]
{'Name': 'Marine Biological Laboratory', 'CityName': 'WOODS HOLE', 'ZipCode': '025431015', 'PhoneNumber': '5082897243', 'StreetAddress': '7 M B L ST', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Massachusetts', 'StateCode': 'MA', 'CONGRESSDISTRICT': '09', 'CONGRESS_DISTRICT_ORG': 'MA09', 'ORG_UEI_NUM': 'M2XKLRTA9G44', 'ORG_LGL_BUS_NAME': 'THE MARINE BIOLOGICAL LABORATORY', 'ORG_PRNT_UEI_NUM': 'M2XKLRTA9G44'}
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{'Code': '1128', 'Text': 'Population & Community Ecology'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1988&All=true', 'xml': '8806691.xml'}