Identification_Information: Citation: Citation_Information: Originator: Ronald Oremland Mark Marvin-DiPasquale Publication_Date: 2005 Title: Methylmercury Degradation Rates Geospatial_Data_Presentation_Form: spreadsheet Online_Linkage: http://sofia.usgs.gov/exchange/marvin-dipasquale/mmdindex.html Description: Abstract: The spreadsheet contains the data for 12 sites for sediment methylmercury degradation potential rate measurements Purpose: High concentrations of methyl-mercury (CH3Hg+), a toxic substance to both animals and humans, recently have been measured in a number of top predators (including panthers and game fish) native to the Florida Everglades. The objective of this research was to provide ecosystem managers with CH3Hg+ degradation rate data from a number of study sites that represent a diversity of hydrologic and nutrient regimes common to the Everglades. The focus was on better understanding the microbial and geochemical controls regulating CH3Hg+ degradation. At the time of the study, little was known about the specific factors influencing this process in natural systems. Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 199606 Single_Date/Time: Calendar_Date: 199612 Single_Date/Time: Calendar_Date: 199704 Single_Date/Time: Calendar_Date: 199707 Single_Date/Time: Calendar_Date: 199801 Single_Date/Time: Calendar_Date: 199806 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -81 East_Bounding_Coordinate: -80 North_Bounding_Coordinate: 26.75 South_Bounding_Coordinate: 25 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: biology Theme_Keyword: geology Theme_Keyword: chemistry Theme_Keyword: methylmercury Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: environment Theme_Keyword: 007 Place: Place_Keyword_Thesaurus: Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions, Federal Information Processing Standard (FIPS) 10-4, Washington, DC, National Institute of Standards and Technology Place_Keyword: United States Place_Keyword: US Place: Place_Keyword_Thesaurus: U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, DC, NIST Place_Keyword: Florida Place_Keyword: FL Place: Place_Keyword_Thesaurus: Department of Commerce, 1990, Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas, FIPS 6-3, Washington, DC, National Institute of Standards and Technology Place_Keyword: Palm Beach County Place_Keyword: Miami-Dade County Place_Keyword: Monroe County Place_Keyword: Broward County Place: Place_Keyword_Thesaurus: USGS Geographic Names Information System Place_Keyword: Everglades National Park Place_Keyword: Loxahatchee National Wildlife Refuge Place: Place_Keyword_Thesaurus: none Place_Keyword: Central Everglades Place_Keyword: Greater Lake Okeechobee Place_Keyword: Everglades Nutrient Removal area Place_Keyword: WCA3 Place_Keyword: WCA2B Place_Keyword: Water Conservation Area 3 Place_Keyword: Water Conservation Area 2B Access_Constraints: none Use_Constraints: none All MeHg production and degradation rates were calculated as potential rates (i.e. based on the amount of radiolabel added) and not as in-situ rates. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Mark Marvin-DiPasquale Contact_Organization: U.S. Geological Survey Contact_Position: Project manager Contact_Address: Address_Type: mailing address Address: 345 Middlefield Road, Building 15, McKelvey Building City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Contact_Voice_Telephone: 650 329 4442 Contact_Facsimile_Telephone: 650 329-4463 Contact_Electronic_Mail_Address: mmarvin@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://sofia.usgs.gov/exchange/marvin-dipasquale/mmdsitemap.gif Browse_Graphic_File_Description: map showing location of sampling sites Browse_Graphic_File_Type: GIF Native_Data_Set_Environment: MS Excel Cross_Reference: Citation_Information: Originator: Marvin-DiPasquale, Mark C. Oremland, Ronald S. Publication_Date: 1998 Title: Bacterial methylmercury degradation in Florida Everglades peat sediment Geospatial_Data_Presentation_Form: report Series_Information: Series_Name: Environmental Science and Technology Issue_Identification: v. 32, n. 17 Publication_Information: Publication_Place: Washington, DC Publisher: American Chemical Society Other_Citation_Details: All users may view the abstract of this article. If you are a subscriber, you may view the article. If you are not a subscriber, you may purchase and download the PDF version of the article. Online_Linkage: http://pubs3.acs.org/acs/journals/doilookup?in_doi=10.1021/es971099l Cross_Reference: Citation_Information: Originator: Marvin-DiPasquale, Mark C. Agee, Jennifer; McGowan, Chad; Oremland, Ronald S.; Thomas, Martha; Krabbenhoft, David; Gilmour, Cynthia C. Publication_Date: 2000 Title: Methyl-mercury degradation pathways: a comparison among three mercury-impacted ecosystems Geospatial_Data_Presentation_Form: report Series_Information: Series_Name: Environmental Science and Technology Issue_Identification: v. 34 , n. 23 Publication_Information: Publication_Place: Washington, DC Publisher: American Chemical Society Other_Citation_Details: All users may view the abstract of this article. If you are a subscriber, you may view the article. If you are not a subscriber, you may purchase and download the PDF version of the article. Online_Linkage: http://pubs3.acs.org/acs/journals/doilookup?in_doi=10.1021/es0013125 Data_Quality_Information: Logical_Consistency_Report: Data were collected at a suite of sites between 1995 and 1998 in the Water Conservation Areas and Everglades National Park. Due to changes in methodology, only data collected since June 1996 is included in the dataset Completeness_Report: Not all sites have data for all dates Lineage: Process_Step: Process_Description: Periodic field measurements of methylmercury (MeHg) degradation potential rates in sediment were conducted between 1995 and 1998, at a suite of study sites in the Water Conservation Areas and Everglades National Park. Intact sediment cores were collected by hand with polycarbonate core tubes (8 cm i.d. x 15-30 cm). The unconsolidated surface floc layer was treated as one discrete interval for June 1996, December 1996, and January 1998. Sediment below this zone was sectioned into 2 cm to 4 cm discrete depth intervals. Discrete depths were sampled for the whole core during April 1997, July 1997, and June 1998. For each interval, sediment from 3-6 cores was pooled for a homogenized composite sample. Subsamples (3 cc) were amended with radiolabeled 14C-MeHg (0.5 to 10 nCi) and incubated anoxically for 0.2 to 7 days at 18-25 deg C in 13 cc serum bottles. Incubations were arrested by adding 1 ml of 3 M NaOH. All incubations were initiated within 10 hours of sample collection, except during April 1997, which were initiated three days after collection. All site/depth discrete sample sets included n=3 replicates and one autoclave killed control. The gaseous 14 C endproducts (14 CH4 and 14 CO2) were assayed by a CH4 combustion/CO2 trapping assay as described in Marvin-DiPasquale and Oremland (1998) Environ. Sci. Tech. 32:2256-2263. Process_Date: 1998 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Mark Marvin-DiPasquale Contact_Organization: U.S. Geological Survey Contact_Position: Project manager Contact_Address: Address_Type: mailing address Address: 345 Middlefield Road, Building 15, McKelvey Building City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Contact_Voice_Telephone: 650 329 4442 Contact_Facsimile_Telephone: 650 329-4463 Contact_Electronic_Mail_Address: mmarvin@usgs.gov Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Water Conservation Areas and Everglades National Park Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Data collected for each site contain site id, date, sediment depth interval (cm), incubation time (days), 14C-MeHG injected (ng/cc wet sed), MeHg degradation first-order rate constant (k), and Me-Hg degradation potential rate (ng/cc set sed/d) Entity_and_Attribute_Detail_Citation: USGS personnel Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Heather S.Henkel Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: 600 Fourth St. South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727 803-8747 ext 3028 Contact_Facsimile_Telephone: 727 803-2030 Contact_Electronic_Mail_Address: hhenkel@usgs.gov Resource_Description: Everglades Sediment Methylmercury Degradation Potential Rate Measurements Distribution_Liability: The data have no explicit or implied guarantees. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: MS Excel Format_Version_Number: unknown Transfer_Size: 0.041 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://sofia.usgs.gov/exchange/marvin-dipasquale/mmdindex.html Access_Instructions: Data may be downloaded from the SOFIA website. Fees: none Metadata_Reference_Information: Metadata_Date: 20080122 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Heather Henkel Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 600 Fourth Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727 803-8747 ext 3028 Contact_Facsimile_Telephone: 727 803-2030 Contact_Electronic_Mail_Address: sofia-metadata@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998