CRED Towed-Diver Benthic Characterization Surveys at Sarigan Island, Marianas Archipelago in 2007

To support NOAA Coral Reef Conservation Program (CRCP) long-term goals for sustainable management and conservation of coral reef ecosystems, towed-diver surveys (aka. towboard surveys) were 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. 6 towboard surveys (12.2932 km in length), were conducted at Sarigan Island during the Marianas Archipelago RAMP Cruise HI0703 from 25 May - 09 June 2007. 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 benthic characterization observations.

Data and Resources

Additional Info

Field Value
Last Updated June 24, 2019, 00:09
Created June 20, 2017, 00:03
access_constraints ["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", "Access Constraints: Data are available two years following data collection date."]
bbox-east-long 145.798646
bbox-north-lat 16.724492
bbox-south-lat 16.684121
bbox-west-long 145.757128
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "2009-05-26"}]
frequency-of-update ASNEEDED
licence ["\n 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.\n "]
metadata-date 2019-05-26
progress completed
resource-type dataset
responsible-party [{"name": "Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[145.757128, 16.684121], [145.798646, 16.684121], [145.798646, 16.724492], [145.757128, 16.724492], [145.757128, 16.684121]]]}
spatial_harvester true
temporal-extent-begin 2007-05-26
temporal-extent-end 2007-05-26