Plant and Soil Characterizations in a Spartina alterniflora Saltmarsh Experiencing Dieback in Terrebonne Parish, Louisiana, Task 2.4

Frequently-anticipated questions:


What does this data set describe?

    Title:
    Plant and Soil Characterizations in a Spartina alterniflora Saltmarsh Experiencing Dieback in Terrebonne Parish, Louisiana, Task 2.4
    Abstract:
    This data set consists of vegetative, physical and soil characteristics/parameters of study sites in both healthy and stressed saltmarshes in Terrebonne Parish.
    Supplemental_Information:
    These data sets can be viewed at the brown marsh web site, not as tabular data, but as graphs. 35 mm photos were also taken at sites, in relation to the data collection.

  1. How should this data set be cited?

    U.S. Geological Survey, National Wetlands Research Center, 2002, Plant and Soil Characterizations in a Spartina alterniflora Saltmarsh Experiencing Dieback in Terrebonne Parish, Louisiana, Task 2.4:.

    This is part of the following larger work.

    Barataria-Terrebonne National Estuary Program Scientific-Technical Committee, 20010207, Requests for submission of Scope of Services for Marsh Dieback and Nutria Control Emergency Response: Barataria-Terrebonne National Estuary Program Scientific-Technical Committee, Thibodaux, LA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -93.8999
    East_Bounding_Coordinate: -89.5242
    North_Bounding_Coordinate: 29.9177
    South_Bounding_Coordinate: 29.2128
    Description_of_Geographic_Extent: Terrebonne Parish

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: Sep-2001
    Ending_Date: Sep-2002
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: Digital tabular data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

    2. What coordinate system is used to represent geographic features?

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    The attributes for this data set include elevation data for plot and zones; soil redox(Eh) potential for surface, 15 cm and 30 cm depths, and mean mV; interstitial porewater chemistry - pH for the designated depths; salinity (ppt), sulfide concentration (mmol), and well water level in relation to elevation (cm); plant data - snail counts (number of snails/meter squared), plant tracking (number of plants/meter squared), relative health of individual plants (percentage classification), mean dead plant stem counts (number of stems/meter squared) and stem height (cm); mean live plant stem counts (number of stems/meter squared) and stem height (cm).
    Entity_and_Attribute_Detail_Citation: Project defined

  8. What biological taxa does this data set concern?

    Taxonomy:
    Keywords/Taxon:
    Taxonomic_Keyword_Thesaurus: None
    Taxonomic_Keywords: Spartina alterniflora
    Taxonomic_Keywords: species
    Taxonomic_Classification:
    Taxon_Rank_Name: Kingdom
    Taxon_Rank_Value: Plantae
    Taxonomic_Classification:
    Taxon_Rank_Name: Division
    Taxon_Rank_Value: Magnoliophyta
    Taxonomic_Classification:
    Taxon_Rank_Name: Class
    Taxon_Rank_Value: Liliopsida
    Taxonomic_Classification:
    Taxon_Rank_Name: Subclass
    Taxon_Rank_Value: Commelinidae
    Taxonomic_Classification:
    Taxon_Rank_Name: Order
    Taxon_Rank_Value: Cyperales
    Taxonomic_Classification:
    Taxon_Rank_Name: Family
    Taxon_Rank_Value: Poaceae
    Taxonomic_Classification:
    Taxon_Rank_Name: Genus
    Taxon_Rank_Value: Spartina
    Taxonomic_Classification:
    Taxon_Rank_Name: Species
    Taxon_Rank_Value: alterniflora
    Applicable_Common_Name: smooth cordgrass


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    U.S. Geological Survey, National Wetlands Research Center
    c/o Thomas C. Michot
    Wildlife Biologist
    700 Cajundome Blvd
    Lafayette, LA 70506
    USA

    337 266-8664 (voice)
    337 266-8513 (FAX)


Why was the data set created?

To determine the causes of the brown marsh phenomenon


How was the data set created?

  1. What methods were used to collect the data?

    Method 0 of 1
    Type: Field/Lab

    Sites were established for both healthy and stressed saltmarsh environments (referenced and impacted, respectively). An initial site, established in June 2000, was identified into 5 vegetation zones based on color and vegetation characteristics. Transects were set up to measure boundaries and to track them over time. For each zone, randomly placed four square-metered quadrants were established. Data collection - for vegetative characteristics, the number and height of live and dead stems were measured; for dead stems, presence or absence of leaf material is indicated, and whether the dead leaves are intact or frayed. For live stems, leaves were counted, measured, and classified according to color green percentage (>90% green, 50-90% green, or <50% green). For soil and physical characteristics, salinity, conductivity, pH, Eh, sulfides, and nutrients were measured in or adjacent to each quadrant at depths of 0 cm (surface), 15 cm and 30 cm below the sediment surface. The interstitial water samples were collected with a siphon and syringe. Salinity, pH and water temperature were measured onsite. Filtered porewater samples (filtered through ashed GF/F filters) were packed on ice for lab analysis of NH4, N+N, NO2 and PO4. Sediment redox potential was measured with a platinum wire and standard calomel electrode standardized with quinhydron.

  2. From what previous works were the data drawn?

  3. How were the data generated, processed, and modified?

    Date: 2000 (process 1 of 1)
    See methodology

  4. 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?

    The accuracy of the attributes is determined by the experienced field biologists and the integrity of the equipment and its maintenance. An exact percent of accuracy can not be determined and would require a more formal comparison of data collection procedures.

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    There are no known omissions in the data.

  5. How consistent are the relationships among the observations, including topology?

    All equipment was calibrated according to manufacturers' guideline. Field procedures for all site visits were followed every time. Contact Principal investigator for all deviations in data collection.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
Data generated by the Brown Marsh principal investigators will be available only to the projectís other principal investigators, following the established QA/QC review, for a period of two years. After two years from the finalization of the data, it shall be made available to the public. Please contact the principal investigator for exact date of availability. It is strongly recommended that these data be directly acquired from the Brown Marsh Database Information Management System server and not indirectly through other sources which may have changed the data in some way.
Use_Constraints:
Acknowledgement of the principal investigator as a data source would be appreciated in products developed from these data, and such acknowledgement as is standard for citation and legal practices for data source is expected by users of these data. Users should be aware that comparison with other data sets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in mapping conventions, methodologies, data collections and computer processes over time. The principal investigator and the distributor shall not be liable for improper or incorrect use of these data, based on the description of appropriate/inappropriate uses described in this metadata document. The principal investigator and distributor make no claims as to the dataís suitability for other purposes. These data are not legal documents and are not to be used as such.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey, National Wetlands Research Center
    c/o Scott Wilson
    Electrical Engineer
    700 Cajundome Blvd
    Lafayette, LA 70506
    USA

    337 266-8664 (voice)
    337 266-8513 (FAX)
    scott_wilson@usgs.gov

  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Although these data have been processed successfully on a computer system at the designated principal investigatorís facility, no warranty expressed or implied is made regarding the accuracy 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. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that these data are directly acquired from the official Brown Marsh Database Information Management System server or from the principal investigator, and not indirectly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be given to the contents of the metadata file associated with these data. The Brown Marsh committee shall not be held liable for improper or incorrect use of the data described and/or contained herein. So, these data are provided as is and without any express or implied warranties. Also, use of trade names or commercial products in the metadata file is solely for the purpose of providing specific information, and does not imply recommendation or endorsement. Any downloading and use of these data signifies a userís agreement to comprehension and compliance of the disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order to protect both user and principal investigators interests.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    None


Who wrote the metadata?

Dates:
Last modified: Apr-2003

Metadata author:
R. Scott Kemmerer
U.S. Geological Survey/NWRC-JWCS
Biologist
700 Cajundome Blvd
Lafayette, LA 70506
USA

337 266-8669 (voice)
337 266-8592 (FAX)
scott_kemmerer@usgs.gov

Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Metadata extensions used:


Generated by mp version 2.7.33 on Mon Apr 07 10:04:00 2003