Sharon A. Fitzgerald 20210622 spreadsheet https://doi.org/10.5066/P920L16R Biogenic silica concentration profiles (in weight percent) for 10 bed sediment cores are shown. Precision and bias were determined by analyses of replicates and reference sediments, respectively. Biogenic silica concentrations were determined in ten sediment cores to reconstruct siliceous phytoplankton blooms and to verify phosphorus inputs to these core sites. 20180521 20180525 observed Complete None planned -84.05710 -84.02206 34.17545 34.14577 World ISO 19115 Topic Category inlandWaters USGS Thesaurus biogenic silica sediment USGS Metadata Identifier USGS:5f4921db82ce4c3d122b2ef1 Common geographic areas Georgia Lake Sidney Lanier Gwinnett County None. Please see 'Distribution Info' for details. None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Sharon A. Fitzgerald U.S. Geological Survey Research Hydrologist mailing and physical

3916 Sunset Ridge Road

Raleigh North Carolina 27607 US 919.571.4020 919.571.4041 safitzge@usgs.gov For determination of analytical bias, three reference sediments were analyzed, two from Lewis Lake (Grand Teton National Park), and one from Yellowstone Lake (Yellowstone National Park) (Conley, 1998). Biogenic silica recovery was calculated as the concentration found divided by the nominal concentration times 100. These two sediments were chosen from a group of four because the nominal concentrations most closely matched those of the sediments from Lake Lanier. For determination of analytical precision, four sets of replicate sediment samples were analyzed. Relative percent difference was calculated as the absolute concentration difference determined in the two replicates divided by the average of the two concentrations times 100. Conley, D.J., 1998, An interlaboratory comparison for the measurement of biogenic silica in sediments: Marine Chemistry, v. 63, no. 1, p. 39-48. All values fall within expected ranges. There are no data omissions or duplications. A total of 85 samples from 10 lake coring sites were analysed for biogenic silica concentration. Biogenic silica concentrations in sediment were determined using a modification of the wet alkaline digestion technique with correction for mineral silica (DeMaster, 1981). The method is specific for amorphous (hydrated) silica and is a good proxy for the abundance of diatoms as well as other siliceous microfossils including chrysophyte cysts, sponge spicules, and phytoliths. DeMaster, D.J., 1981, The supply and accumulation of silica in the marine environment: Geochimica et Cosmochimica Acta, v. 45, p. 1715-1732. 20200831 Lake.Lanier.biogenic.silica.data.csv Comma Separated Value (CSV) file containing data. Producer Defined Station number Unique 15 digit number identifying the station Producer Defined 340919084014301 341017084024201 Station name Unique name of the station Producer Defined A unique name identifying the station Sample date The collection date of the sample Producer Defined 5/21/2018 5/25/2018 Sample time The collection time of the sample Producer Defined 0900 1415 Sample identification An abbreviated station name and depth interval for the sample in centimeters Producer Defined LI1 = Lake Island Cove core 1 LI2 = Lake Island Cove core 2 SF1 = Shadburn Ferry Cove 1 SF2 = Shadburn Ferry Cove 2 LV1 = Lakeview Cove core 1 LV2 = Lakeview Cove core 2 SC1 = Shoal Creek Channel core 1 SC2 = Shoal Creek Channel core 2 SC3 = Shoal Creek Channel core 3 CC = Chattahoochee Channel Midpoint depth (cm) The depth from the sediment/water interface of the midpoint of the sample interval in centimeters Producer Defined 1.0 76.0 Biogenic silica (Wt %) The concentration of biogenic silica in weight percent. Producer Defined 6.7 33.9 Lake.Lanier.biogenic.silica.replicates.data.csv Comma Separated Value (CSV) file containing data. Producer Defined Station number A unique number identifying the station Producer Defined 340922084020201 341012084024401 Station name A unique name identifying the station Producer Defined A unique name identifying the station Sample date The collection date of the sample Producer Defined << empty cell >> No Data Producer defined 5/21/2018 5/24/2018 Sample time The collection time of the sample Producer Defined 1008 1401 Sample identification An abbreviated station name and depth interval for the sample in centimeters Producer Defined LI2 = Lake Island Cove core 2 SF1 = Shadburn Ferry Cove 1 SC3 = Shoal Creek Channel core 3 CC = Chattahoochee Channel Midpoint depth (cm) The depth from the sediment/water interface of the midpoint of the sample interval in centimeters Producer Defined 2.5 27.0 Biogenic silica (Wt %) The concentration of biogenic silica in weight percent Producer Defined 13.8 33.7 RPD (%) Relative percent difference in percent Producer Defined -- No Data Producer defined 8.1 16 Lake.Lanier.biogenic.silica.recoveries.data.csv Comma Separated Value (CSV) file containing data. Producer Defined Reference sediment The name of sediment with known nominal biogenic silica concentration Producer Defined Lewis Lake A lake within Grand Teton National Park. The nominal biogenic silica concentration of this sediment is 44.3 weight percent. Producer defined Yellowstone Lake A lake within Yellowstone National Park. The nominal biogenic silica concentration of this sediment is 38.2 weight percent. Producer defined Nominal biogenic silica (Wt%) Median biogenic silica concentration in weight percent determined during a round robin analyses by several laboratories Producer Defined 38.2 44.3 Found biogenic silica (Wt%) Biogenic silica concentration in weight percent determined in the present study Producer Defined 34.1 44.7 Recovery (%) The percent of the nominal value that was found Producer Defined 89 101 GS ScienceBase U.S. Geological Survey mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P920L16R None 20210622 Jeffrey W Riley U.S. Geological Survey, Southeast Region Ecologist mailing address

1770 Corporate Drive Suite 500

Norcross GA 30093 US 678-924-6682 678-924-6710 jriley@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999