CRED Towed-Diver Fish Biomass Surveys at Agrihan Island, Marianas Archipelago in 2003

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
Publication_Date: 20050906
Title:
CRED Towed-Diver Fish Biomass Surveys at Agrihan Island, Marianas Archipelago in 2003
Geospatial_Data_Presentation_Form: database
Online_Linkage: <http://www.pifsc.noaa.gov/cred/towboard.php>
Description:
Abstract:
Towed-diver surveys (aka. Towboard surveys) are conducted by the Coral Reef Ecosystem Division (CRED) of the NOAA Pacific Islands Fisheries Science Center (PIFSC) as part of biennial Pacific Reef Assessment and Monitoring Program (RAMP) Cruises. These cruises support NOAA Coral Reef Conservation Program (CRCP) long-term goals for sustainable management and conservation of coral reef ecosystems. 12 towboard surveys (22.4522 km in length), were conducted at Agrihan Island in the Marianas Archipelago from 19 August - 30 September 2003 as part of RAMP Cruise OES0307. Towboard surveys are a good method for obtaining a general description of large reef areas, assessing the status of low-density populations of large-bodied reef fish, large-scale disturbances (e.g., bleaching), general distribution and abundance patterns of macro-invertebrates (e.g., COT, giant clams), and for assessing trends in these populations and metrics. A pair of scuba divers (1 fish and 1 benthic diver) are towed 60 m behind a small survey launch at a speed of 1-2 knots and a depth of approximately 15m. Each survey is 50 min long, covers about 2 km of habitat, and is divided into ten 5-minute survey segments.  The fish diver records, to the lowest possible taxon, all large-bodied reef fishes (>50cmTL) seen within 5m either side and 10m in front of the towboard. Length of each individual is estimated to the nearest cm. The fish towboard is also outfitted with a forward-facing digital video camera to record the survey swath.  The benthic diver records percent cover of coral and macroalgae, estimates benthic habitat type and complexity, and censuses a suite of benthic macroinvertebrates including Crown of Thorns sea stars and sea urchins. The benthic towboard is equipped with a downward-facing digital still camera which images the benthos at 15 second intervals. These images are analyzed for percent cover of coral, algae, and other benthic components.  Both towboards are equipped with SEABIRD SBE-39 temperature/depth sensors set to record at 5 second intervals. Latitude and longitude of each survey track is recorded at 15 second intervals using a Global Positioning System (GPS) receiver onboard the tow boat.  A layback algorithm is applied to more accurately map the position of the divers with respect to the reef environment. This algorithm calculates the position of the divers based on the position of the tow boat taking into account the length of the tow rope, the depth of the divers, and the curvature of the survey track.  This metadata applies to the fish biomass observations.
Purpose:
Part of a biennial long-term monitoring program to document status and trends in the coral reef ecosystems of the US Pacific Territories.
Supplemental_Information:
Data collected: Species level abundance and length information for coral reef fishes >50cm total length.  Data is linked to geographic shapefile via DiveID or SegID.  Abundance and/or biomass data can be provided at the species or family level.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20030827
Ending_Date: 20030906
Currentness_Reference: Ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: asNeeded
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 145.625762
East_Bounding_Coordinate: 145.705743
North_Bounding_Coordinate: 18.823275
South_Bounding_Coordinate: 18.716814
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Marine Ecosystem
Theme_Keyword: Reef Assessment and Monitoring Program (RAMP)
Theme_Keyword: Towed Diver Surveys
Theme_Keyword: Coral Reef
Theme_Keyword: Benthic Habitats
Theme_Keyword: Reef Fishes
Theme_Keyword: Marianas Archipelago
Theme_Keyword: Agrihan Island
Theme_Keyword: OES0307
Theme:
Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus
Theme_Keyword: EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs
Theme_Keyword:
EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral reef ecology
Theme_Keyword:
EARTH SCIENCE > Biosphere > Zoology > Corals > Reef monitoring and assessment
Theme_Keyword:
EARTH SCIENCE > Biosphere > Zoology > Corals > Reef monitoring and assessment > Reef fish census
Theme:
Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus
Theme_Keyword: Numeric Data Sets > Biology
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: biota
Theme_Keyword: 002
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: The United States
Place_Keyword: Marianas Archipelago
Place_Keyword: Agrihan Island
Place:
Place_Keyword_Thesaurus: CoRIS Place Thesaurus
Place_Keyword:
OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Agrihan Island > Agrihan Island (18N145E0002)
Place_Keyword:
COUNTRY/TERRITORY > Northern Mariana Islands > Agrihan Island > Agrihan Island (18N145E0002)
Place:
Place_Keyword_Thesaurus: CoRIS Region
Place_Keyword: CNMI
Access_Constraints: Data are available two years following data collection date.
Use_Constraints:
Please cite CRED when using the data. Coral Reef Ecosystem Division, Pacific Islands Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
Contact_Person: Dr. Ivor D Williams
Contact_Address:
Address_Type: mailing and physical address
Address: NOAA IRC
Address: NMFS/PIFSC/CRED
Address: 1845 WASP Blvd., Building 176
City: Honolulu
State_or_Province: HI
Postal_Code: 96818
Country: USA
Contact_Voice_Telephone: 808 725-5360
Contact_Facsimile_Telephone: 808 725-5429
Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
Contact_Instructions: e-mail preferred
Data_Set_Credit:
Brian Zgliczynski and Joe Laughlin,Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Sciences Center, National Marine Fisheries Service, NOAA
Security_Information:
Security_Classification_System: Not applicable
Security_Classification: Unclassified
Security_Handling_Description: Not applicable
Native_Data_Set_Environment: Oracle

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Observations were made by the divers who are trained in fish taxonomy. Divers may change from year to year and by location.
Logical_Consistency_Report:
The same data collection protocols were used at each island/bank surveyed.
Completeness_Report:
The towboard surveys are completed in forereef, backreef, and lagoon habitats. The minimum spatial resolution of the towboard survey is the 5 minute survey segment which covers approximately 200m. As such, these surveys are appropriate for broad estimates but can not be used for fine scale, site level data analysis.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Although resource grade GPS units were used and a layback model was applied to the survey tracks, the exact survey positions were not physically marked and effort was not made to revisit exact same tracks.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 1
Horizontal_Positional_Accuracy_Explanation: Instrument parameters
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: SeaBird SBE-39 temp/depth recorder
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 0.3
Vertical_Positional_Accuracy_Explanation: Instrument parameters
Lineage:
Process_Step:
Process_Description:
The towboard survey involves a pair of scuba divers who are towed 60 m behind a small boat at a constant speed (~1.5 knots).  The towboard survey is typically 50 min long and covers about 2 km of habitat, depending on the depth profile of the divers. The survey is divided into 5 min segments. During the survey, the fish diver records, to the lowest possible taxon, large fishes observed within a survey swath 5 m to either side of the diver and 10 m in front the diver.
Process_Date: Unknown

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0001
Longitude_Resolution: 0.0001
Geographic_Coordinate_Units: Decimal Degrees
Geodetic_Model:
Horizontal_Datum_Name: World Geodetic System 1984 (WGS84)
Ellipsoid_Name: Geodetic Reference System 80 (GRS80)
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.2572236
Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: Local surface
Depth_Resolution: 1
Depth_Distance_Units: meters
Depth_Encoding_Method: Explicit Depth Coordinate Included with Horizontal Coordinates

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
Contact_Person: CRED Data Management Team
Contact_Address:
Address_Type: mailing and physical address
Address: NOAA IRC
Address: NMFS/PIFSC/CRED
Address: 1845 WASP Blvd., Building 176
City: Honolulu
State_or_Province: HI
Postal_Code: 96818
Country: USA
Contact_Voice_Telephone: 808 725-5360
Contact_Facsimile_Telephone: 808 725-5429
Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
Contact_Instructions: e-mail preferred
Resource_Description: Offline Data
Distribution_Liability:
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: XLS (Microsoft Excel worksheet), .csv, .dbf
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CDROM, or email
Recording_Format: ISO 9660
Fees: None if receiving the data online
Custom_Order_Process: Contact CRED data management team for information
Technical_Prerequisites: Contact CRED data management team for information

Metadata_Reference_Information:
Metadata_Date: 20140312
Metadata_Review_Date: 20100317
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
Contact_Address:
Address_Type: mailing and physical address
Address: NOAA IRC
Address: NMFS/PIFSC/CRED
Address: 1845 WASP Blvd., Building 176
City: Honolulu
State_or_Province: HI
Postal_Code: 96818
Country: USA
Contact_Voice_Telephone: 808 725-5360
Contact_Facsimile_Telephone: 808 725-5429
Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
Contact_Instructions: e-mail preferred
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

CoRIS:
CoRIS_ID: 20100317120744
CoRIS_Children: None
CoRIS_Beginning_Date: 20030827
CoRIS_Ending_Date: 20030906
CoRIS_Metadata_Link:
<http://www.coris.noaa.gov/metadata/records/html/cred_towboard_fishbiomass_agrihan_island_2003.html>
CoRIS_Tracking_ID: 4517

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