Substrate properties for invertebrate comparisons in Bellingham Bay, Washington, July 2019 and July-August 2020

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Frequently anticipated questions:

What does this data set describe?

Title:
Substrate properties for invertebrate comparisons in Bellingham Bay, Washington, July 2019 and July-August 2020
Abstract:
Sediment grain-size distributions and total organic carbon contents were measured at four intertidal sites and three subtidal sites along the urban waterfront (east shore) of Bellingham Bay, Washington, July 3-11, 2019 and June 6-August 31, 2020. Intertidal substrate was sampled in eelgrass beds, and subtidal substrate was sampled inside and outside of the deep edge of eelgrass beds.
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at:
http://cmgds.marine.usgs.gov/fan_info.php?fan=2019-627-FA
http://cmgds.marine.usgs.gov/fan_info.php?fan=2020-639-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Takesue, Renee K., and Rubin, Stephen P., 20230824, Substrate properties for invertebrate comparisons in Bellingham Bay, Washington, July 2019 and July-August 2020: data release DOI:10.5066/P9LOCE8T, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Takesue, Renee K., and Rubin, Stephen P., 2023, Eelgrass and substrate characteristics in Bellingham Bay, Washington, July 2019 and July-August 2020: data release DOI:10.5066/P9LOCE8T, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: Takesue, R.K. and Rubin, S.P., 2023, Eelgrass and substrate characteristics in Bellingham Bay, Washington, July 2019 and July-August 2020: U.S. Geological Survey data release, https://doi.org/10.5066/P9LOCE8T.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.52027
    East_Bounding_Coordinate: -122.50039
    North_Bounding_Coordinate: 48.73359
    South_Bounding_Coordinate: 48.71480
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/64b0a83dd34e70357a29eada?name=pic_invertebrate_substrate_sampling.jpg&allowOpen=true (JPG)
    Picture of sediment sampling for invertebrate comparisons.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 03-Jul-2019
    Ending_Date: 31-Aug-2020
    Currentness_Reference:
    Eelgrass and substrate characteristics are reported for July 2019 and June 2020-August 2020.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited text
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (56)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.0000.
      The flattening of the ellipsoid used is 1/298.2572.
  7. How does the data set describe geographic features?
    Attribute table
    Table of data (Source: Producer defined)
    Field_ID
    Unique identifier assigned to each sample based on collection location, year, and order (Source: Producer defined) Unique alphanumeric sample identifier
    Site_ID
    Identifier for the sample collection site (Source: Producer defined)
    ValueDefinition
    MPMarine Park
    TBTaylor Bridge
    BPNBoulevard Park North
    BPWBoulevard Park West
    Sample_depth
    Depth zone of the sample collection site (Source: Producer defined)
    ValueDefinition
    INTERTIDALLower intertidal site accessed at low tide.
    DEEPSubtidal site accessed by divers.
    Substrate_type
    Ground cover at the sample collection site (Source: Producer defined)
    ValueDefinition
    EELGRASSThe sampling site was in eelgrass.
    BAREThe sampling site was on bare (unvegetated) substrate.
    Date_collected
    Date the sample was collected, in mm/dd/yy. (Source: Producer defined)
    Range of values
    Minimum:07/03/19
    Maximum:08/31/20
    Units:mm/dd/yy
    Resolution:1
    Latitude
    Latitude where the sample was collected. (Source: Producer defined)
    Range of values
    Minimum:48.71480
    Maximum:48.73359
    Units:decimal degrees
    Resolution:0.00001
    Longitude
    Longitude where the sample was collected. (Source: Producer defined)
    Range of values
    Minimum:-122.52027
    Maximum:-122.50039
    Units:decimal degrees
    Resolution:0.00001
    Datum
    Geodetic datum coordinate system (Source: Producer defined)
    ValueDefinition
    WGS84World Geodetic System 1984
    Percent_Gravel
    percent of sample greater than 2 mm. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:12.7
    Units:percentage
    Resolution:0.1
    Percent_Sand
    percent of sample less than 2 mm and greater than 63 microns. (Source: producer defined)
    Range of values
    Minimum:11.6
    Maximum:97.0
    Units:percentage
    Resolution:0.1
    Percent_Silt
    percent of sample less than 63 microns and greater than 4 microns. (Source: producer defined)
    Range of values
    Minimum:1.7
    Maximum:62.5
    Units:percentage
    Resolution:0.1
    Percent_Clay
    percent of sample less than 4 microns. (Source: producer defined)
    Range of values
    Minimum:1.2
    Maximum:26.6
    Units:percentage
    Resolution:0.1
    Percent_Mud
    percent of sample less than 63 microns. (Source: producer defined)
    Range of values
    Minimum:2.8
    Maximum:88.4
    Units:percentage
    Resolution:0.1
    TOC
    Average value of duplicate analyses of total organic carbon content (TOC). (Source: Producer defined)
    Range of values
    Minimum:0.2
    Maximum:20.4
    Units:weight percent
    Resolution:0.1
    -4.00phi_16mm
    Weight percent of sample with grain diameter greater than -4.00 phi, or 16 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -3.75phi_13.5mm
    Weight percent of sample with grain diameter between -4.00 and -3.75 phi, or 13.5 and 16 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -3.50phi_11.2mm
    Weight percent of sample with grain diameter between -3.75 and -3.50 phi, or 11.2 and 13.5 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -3.25phi_9.51mm
    Weight percent of sample with grain diameter between -3.50 and -3.25 phi, or 9.51 and 11.2 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -3.00phi_8mm
    Weight percent of sample with grain diameter between -3.25 and -3.00 phi, or 8 and 9.51 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -2.75phi_6.73mm
    Weight percent of sample with grain diameter between -3.00 and -2.75 phi, or 6.73 and 8 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -2.5phi_5.66mm
    Weight percent of sample with grain diameter between -2.75 and -2.50 phi, or 5.66 and 6.73 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -2.25phi_4.76mm
    Weight percent of sample with grain diameter between -2.50 and -2.25 phi, or 4.76 and 5.66 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -1.75phi_3.36mm
    Weight percent of sample with grain diameter between -2.00 and -1.75 phi, or 3.36 and 4 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -1.5phi_2.83mm
    Weight percent of sample with grain diameter between -1.75 and -1.50 phi, or 2.83 and 3.36 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -1.25phi_2.38mm
    Weight percent of sample with grain diameter between -1.50 and -1.25 phi, or 2.38 and 2.83 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -1phi_2mm
    Weight percent of sample with grain diameter between -1.25 and -1.00 phi, or 2 and 2.38 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -0.75phi_1.68mm
    Weight percent of sample with grain diameter between -1.00 and -0.75 phi, or 1.68 and 2 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -0.5phi_1.41mm
    Weight percent of sample with grain diameter between -0.75 and -0.50 phi, or 1.41 and 1.68 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    -0.25phi_1.19mm
    Weight percent of sample with grain diameter between -0.50 and -0.25 phi, or 1.19 and 1.41 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    0phi_1mm
    Weight percent of sample with grain diameter between -0.25 and 0.00 phi, or 1 and 1.19 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    0.25phi_0.8409mm
    Weight percent of sample with grain diameter between 0.00 and 0.25 phi, or 0.8409 and 1 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    0.5phi_0.7071mm
    Weight percent of sample with grain diameter between 0.25 and 0.50 phi, or 0.7071 and 0.8409 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    0.75phi_0.5946mm
    Weight percent of sample with grain diameter between 0.50 and 0.75 phi, or 0.5946 and 0.7071 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    1phi_0.5mm
    Weight percent of sample with grain diameter between 0.75 and 1.00 phi, or 0.5 and 0.5946 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    1.25phi_0.4204mm
    Weight percent of sample with grain diameter between 1.00 and 1.25 phi, or 0.4204 and 0.5 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    1.5phi_0.3536mm
    Weight percent of sample with grain diameter between 1.25 and 1.50 phi, or 0.3536 and 0.4204 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    1.75phi_0.2973mm
    Weight percent of sample with grain diameter between 1.50 and 1.75 phi, or 0.2973 and 0.3536 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    2phi_0.25mm
    Weight percent of sample with grain diameter between 1.75 and 2.00 phi, or 0.25 and 0.2973 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    2.25phi_0.2102mm
    Weight percent of sample with grain diameter between 2.00 and 2.25 phi, or 0.2102 and 0.25 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    2.5phi_0.1768mm
    Weight percent of sample with grain diameter between 2.25 and 2.50 phi, or 0.1768 and 0.2102 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    2.75phi_0.1487mm
    Weight percent of sample with grain diameter between 2.50 and 2.75 phi, or 0.1487 and 0.1768 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    3phi_0.125mm
    Weight percent of sample with grain diameter between 2.75 and 3.00 phi, or 0.125 and 0.1487 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    3.25phi_0.1051mm
    Weight percent of sample with grain diameter between 3.00 and 3.25 phi, or 0.1051 and 0.125 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    3.5phi_0.088388mm
    Weight percent of sample with grain diameter between 3.25 and 3.50 phi, or 0.08839 and 0.1051 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    3.75phi_0.074325mm
    Weight percent of sample with grain diameter between 3.50 and 3.75 phi, or 0.07433 and 0.08839 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    4phi_0.0625mm
    Weight percent of sample with grain diameter between 3.75 and 4.00 phi, or 0.0625 and 0.07433 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    4.25phi_0.052556mm
    Weight percent of sample with grain diameter between 4.00 and 4.25 phi, or 0.052556 and 0.0625 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    4.5phi_0.044194mm
    Weight percent of sample with grain diameter between 4.25 and 4.50 phi, or 0.044194 and 0.052556 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    4.75phi_0.037163mm
    Weight percent of sample with grain diameter between 4.50 and 4.75 phi, or 0.037163 and 0.044194 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    5phi_0.03125mm
    Weight percent of sample with grain diameter between 4.75 and 5.00 phi, or 0.03125 and 0.037163 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    5.25phi_0.026278mm
    Weight percent of sample with grain diameter between 5.00 and 5.25 phi, or 0.02628 and 0.03125 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    5.5phi_0.022097mm
    Weight percent of sample with grain diameter between 5.25 and 5.50 phi, or 0.0221 and 0.02628 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    5.75phi_0.018581mm
    Weight percent of sample with grain diameter between 5.50 and 5.75 phi, or 0.01858 and 0.0221 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    6phi_0.015625mm
    Weight percent of sample with grain diameter between 5.75 and 6.00 phi, or 0.01563 and 0.01858 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    6.25phi_0.013139mm
    Weight percent of sample with grain diameter between 6.00 and 6.25 phi, or 0.01314 and 0.01563 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    6.5phi_0.011049mm
    Weight percent of sample with grain diameter between 6.25 and 6.50 phi, or 0.01105 and 0.01314 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    6.75phi_0.009291mm
    Weight percent of sample with grain diameter between 6.50 and 6.75 phi, or 0.00929 and 0.01105 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    7phi_0.007813mm
    Weight percent of sample with grain diameter between 6.75 and 7.00 phi, or 0.00781 and 0.00929 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    7.25phi_0.00657mm
    Weight percent of sample with grain diameter between 7.00 and 7.25 phi, or 0.00657 and 0.00781 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    7.5phi_0.005524mm
    Weight percent of sample with grain diameter between 7.25 and 7.50 phi, or 0.00552 and 0.00657 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    7.75phi_0.004645mm
    Weight percent of sample with grain diameter between 7.50 and 7.75 phi, or 0.00465 and 0.00552 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    8phi_0.003906mm
    Weight percent of sample with grain diameter between 7.75 and 8.00 phi, or 0.00391 and 0.00465 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    8.25phi_0.003285mm
    Weight percent of sample with grain diameter between 8.00 and 8.25 phi, or 0.00329 and 0.00391 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    8.5phi_0.002762mm
    Weight percent of sample with grain diameter between 8.25 and 8.50 phi, or 0.00276 and 0.00329 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    8.75phi_0.002323mm
    Weight percent of sample with grain diameter between 8.50 and 8.75 phi, or 0.00232 and 0.00276 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    9phi_0.001953mm
    Weight percent of sample with grain diameter between 8.75 and 9.00 phi, or 0.00195 and 0.00232 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    9.25phi_0.001642mm
    Weight percent of sample with grain diameter between 9.00 and 9.25 phi, or 0.00164 and 0.00195 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    9.5phi_0.001381mm
    Weight percent of sample with grain diameter between 9.25 and 9.50 phi, or 0.00138 and 0.00164 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    9.75phi_0.001161mm
    Weight percent of sample with grain diameter between 9.50 and 9.75 phi, or 0.00116 and 0.00138 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    9.99phi_0.000983mm
    Weight percent of sample with grain diameter between 9.75 and 9.99 phi, or 0.00098 and 0.00116 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    10.25phi_0.000821mm
    Weight percent of sample with grain diameter between 9.99 and 10.25 phi, or 0.00082 and 0.00098 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    10.5phi_0.000691mm
    Weight percent of sample with grain diameter between 10.25 and 10.50 phi, or 0.00069 and 0.00082 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    10.75phi_0.000581mm
    Weight percent of sample with grain diameter between 10.50 and 10.75 phi, or 0.00058 and 0.00069 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    10.99phi_0.000492mm
    Weight percent of sample with grain diameter between 10.75 and 10.99 phi, or 0.00049 and 0.00058 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    11.25phi_0.000411mm
    Weight percent of sample with grain diameter between 10.99 and 11.25 phi, or 0.0004 and 0.00049 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    11.48phi_0.00035mm
    Weight percent of sample with grain diameter between 11.25 and 11.48 phi, or 0.00035 and 0.0004 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    12.02phi_0.000241mm
    Weight percent of sample with grain diameter between 11.48 and 12.02 phi, or 0.000241 and 0.00035 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    13.02phi_0.00012mm
    Weight percent of sample with grain diameter between 12.02 and 13.02 phi, or 0.00012 and 0.000241 mm. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:0.01
    Entity_and_Attribute_Overview: The first line of the csv file is a header line.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Renee K. Takesue
    • Stephen P. Rubin
  2. Who also contributed to the data set?
    Angela Tan measured sediment grain-size distributions and total organic carbon contents at the USGS Pacific Coastal and Marine Science Center Sediment Laboratory.
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

Intertidal and subtidal substrate samples were paired with invertebrate collections to explore relationships among eelgrass and environmental gradients, sediment texture and organic carbon content, and invertebrate community composition and abundance.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 31-Aug-2020 (process 1 of 2)
    SEDIMENT COLLECTION: A rigid tube with an inner diameter of 4.7 cm was used to collect by hand a plug of sediment from the surface to approximately 10 cm depth. Paired samples were collected for substrate characterization and infaunal invertebrate community analysis. Intertidal sediment was collected at low tide when the substrate was exposed to air. Subtidal sediment was collected by divers. Sediment was extruded into plastic bags and stored chilled until analysis.
    Date: 09-Mar-2021 (process 2 of 2)
    SEDIMENT GRAIN-SIZE AND TOTAL ORGANIC CARBON CONTENT (TOC): Sediment particle size distributions were determined at the USGS Pacific Coastal and Marine Science Center sediment laboratory. To remove organic material, 10 milliliters of 35 percent hydrogen peroxide were added to 20 grams of sediment. The sample was heated to 250 degrees Celsius to remove any remaining hydrogen peroxide and was placed in an ultrasonic bath to liberate the less than 0.063 millimeter-diameter (fine) fraction. The sample was centrifuged for 1.5 hours in deionized water to remove soluble salts. Samples were funneled while wet through 2-millimeter and 0.063-millimeter mesh sieves to separate gravel-sized (greater than 2 millimeter), sand-sized (0.063 to 2 millimeter), and mud-sized (less than 0.063 millimeter) particles. The sand and gravel fractions were dried at 80 degrees Celsius and weighed. Five milliliters of sodium hexametaphosphate was added to the mud fraction and a 20 milliliter aliquot was taken from a 1 liter graduated cylinder to determine the weight of the mud. The particle-size distribution of the mud and sand fractions was analyzed separately using a Beckman Coulter LS 13 320, and the gravel, sand, and mud results were integrated into a single grain-size distribution for each sample. Total carbon and total inorganic carbon of bulk sediment were determined coulometrically (UIC, Inc.) at the USGS Pacific Coastal and Marine Science Center Sediment Laboratory. Samples were run in duplicate. Coulometer performance was verified relative to a calcium carbonate reference material. Total organic carbon content (TOC) was calculated as the difference between total carbon and total inorganic carbon. Person who carried out this activity:
    Angela Tan
    USGS PCMSC
    Physical Scientist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7409 (voice)
    atan@usgs.gov
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    GRAIN SIZE: Duplicates were run every 20 samples and are reported in the table of data. TOTAL ORGANIC CARBON CONTENT: All samples were run in duplicate and average values reported. In addition, sample duplicates were run every 20 samples. Duplicates differed by 9 to 12 percent with a median of 9 percent.
  2. How accurate are the geographic locations?
    A Garmin handheld GPS reported a horizontal accuracy of 3 meters.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Subtidal substrate (DEEP) was not characterized at Taylor Bridge.
  5. How consistent are the relationships among the observations, including topology?
    No formal logical consistency tests were conducted.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints None
Use_Constraints USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in csv format (BellinghamInvertebrateSubstrate2019_2020.csv) and are accompanied by CSDGM FGDC compliant metadata.
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    These data can be viewed with any text reader.

Who wrote the metadata?

Dates:
Last modified: 24-Aug-2023
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P9LOCE8T/BellinghamInvertebrateSubstrate2019_2020_metadata.faq.html>
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