CRED Rapid Ecological Assessment Reef Fish Survey at Tinian, Marianas in 2011

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Frequently anticipated questions:


What does this data set describe?

Title:
CRED Rapid Ecological Assessment Reef Fish Survey at Tinian, Marianas in 2011
Abstract:
To support a long-term NOAA Coral Reef Conservation Program (CRCP) for sustainable management and conservation of coral reef ecosystems, from 20110407 to 20110509, reef fish assessment surveys were conducted, as a part of Rapid Ecological Assessments (REA), during the Pacific Reef Assessment and Monitoring Program (RAMP) Cruise HA1101 in the Marianas region by the Coral Reef Ecosystem Division (CRED) at the NOAA Pacific Islands Fisheries Science Center (PIFSC). During the cruise, 19 REA sites were surveyed at Tinian in the Marianas region. At each REA site, fish biologists entered the water and conducted a fine-scale (~700 m^2) and high degree of taxonomic resolution REA survey to assess and monitor species diversity, size distribution, and abundance of fish in shallow-water hard-bottom (less than 30 m) habitats. Reef fish assessment surveys were focused on cataloging the diversity (species richness), abundance (numeric density) and biomass (fish mass per unit area) of diurnally active reef fish assemblages. The stationary point count (SPC) method was used to quantify reef fish species. Two divers lay out a 30 m transect line, and position themselves at the 7.5 and 22.5 meter marks. The SPC biologist then records estimated size and abundance of all fish within a visually estimated 15-m diameter cylinder centered on the stationary diver (7.5-m radius, total area ~ 177m^2 per cylinder). The diver first spends 5 minutes identifying all fish species in the cylindrical area, then proceeds to count and estimate size (total length) for each in a series of "instantaneous" point counts or sweeps of the cylinder. Fish were identified at the species level, wherever possible. All reef-associated fish, including those in the water column, were surveyed. The survey time for each stationary point count survey was approximately 20 min and generally two stationary point count surveys (one per diver) were conducted at each fish REA site. After completing REA surveys, divers noted the presence, at the survey site, of any unusual fish species not counted during SPC counts, in order to facilitate species lists per location.
Supplemental_Information: Maximum depth was 27 meters.
  1. How should this data set be cited?

    Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), 20110628, CRED Rapid Ecological Assessment Reef Fish Survey at Tinian, Marianas in 2011.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: 145.58671569
    East_Bounding_Coordinate: 145.66305
    North_Bounding_Coordinate: 15.09925484
    South_Bounding_Coordinate: 14.93154427

  3. What does it look like?

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

    Beginning_Date: 09-Apr-2011
    Ending_Date: 03-May-2011
    Currentness_Reference: Ground Condition

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

    Geospatial_Data_Presentation_Form: spreadsheet

  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?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in Decimal Degrees.

      The horizontal datum used is World Geodetic System 1984 (WGS84).
      The ellipsoid used is Geodetic Reference System 80 (GRS80).
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.2572236.

  7. How does the data set describe geographic features?


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?

    Emily Donham, Marie Ferguson, Mark Manuel, Kaylyn McCoy, Jill Zamzow, Paula Ayotte, Valerie Brown, Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Sciences Center, NOAA National Marine Fisheries Service

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

    Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
    NOAA IRC
    Honolulu, HI 96818
    USA

    808 725-5360 (voice)
    808 725-5429 (FAX)
    nmfs.pic.credinfo@noaa.gov

    Contact_Instructions: e-mail preferred


Why was the data set created?

status and trends of coral reef ecosystems within the United States Pacific Territories.


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: Unknown (process 1 of 1)
    REA surveys are investigations that provide a high degree of taxonomic resolution for reef fish communities. The surveys were conducted by teams of two fish divers following a random stratified design. Sites were randomly chosen within three depth strata for hard-bottom or unknown reef areas. These areas included forereef slopes of individual islands at depths up to 30 meters, lagoonal-type patch reefs and offshore oceanic banks. Transect placement was guided by: (1) a focus on hard-bottom communities; (2) deploying lines along an isobath to the extent possible at each site, and (3) laying the transect lines into the prevailing current, if any.

  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?

    Observations at each site were made by divers who have been trained, and met minimum standards in identifying species present at the survey locations and in estimating size of fishes in survey counts. However, all species identifications are made visually, sometimes in situations where a fish is only briefly seen. Observations, including species identification and sizing, were periodically checked during the expedition for consistency between divers, and little discrepancy was noted between divers. Data is checked after each cruise, but given the size of the data set, there remains some possibility of typographical or other errors.

  2. How accurate are the geographic locations?

    GPS unit

  3. How accurate are the heights or depths?

    Dive computer and SCUBA depth gauge

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

    The survey sites were randomly selected using a systematic process based on available habitat and bathymetric habitats. However, although efforts are made to include broad spatial coverage, weather conditions and other environmental constraints may have prevented the team from surveying exposed reef areas.

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

    The same methods of data collection were used at each of the sites surveyed at this location, and were conducted by the same scientists. Periodic examination of the data through the duration of the trip showed no clear indication of diver bias or other discrepancies.


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:
Please cite CRED when using data. Coral Reef Ecosystem Division, Pacific Islands Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration

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

    Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
    Data Manager
    NOAA IRC
    Honolulu, HI 96818
    USA

    808 725-5360 (voice)
    808 725-5429 (FAX)
    nmfs.pic.credinfo@noaa.gov

    Contact_Instructions: e-mail preferred
  2. What's the catalog number I need to order this data set?

    Offline Data

  3. What legal disclaimers am I supposed to read?

    While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

  4. How can I download or order the data?

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

    Contact CRED data management team for information

  6. What hardware or software do I need in order to use the data set?

    Contact CRED data management team for information


Who wrote the metadata?

Dates:
Last modified: 16-Sep-2014
Last Reviewed: 20-Jul-2011
Metadata author:
Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
NOAA IRC
Honolulu, HI 96818
USA

808 725-5360 (voice)
808 725-5429 (FAX)
nmfs.pic.credinfo@noaa.gov

Contact_Instructions: e-mail preferred
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


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