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CRED Towed-Diver Benthic Characterization Surveys at Palmyra Atoll, Pacific Remote Island Areas in 2001
Zusammenfassung
- Art der Freigabe
- a one-off release of a single dataset
- Datenlizenz
- Not Applicable
- Inhaltslizenz
- Creative Commons CCZero
- Bestätigung
- automatisiert zertifiziert
- Veröffentlichungsdatum
- 27 September 2015
- Änderungsdatum
- 27 September 2015
- Aktualisierungshäufigkeit
- ASNEEDED
- Herausgeber
- National Oceanic and Atmospheric Administration, Department of Commerce
- Identifier
- cred-towed-diver-benthic-characterization-surveys-at-palmyra-atoll-pacific-remote-island-a-2001
- Landing Page
- http://catalog.data.gov/dataset/cred-towed-diver-benthic-characterization-surveys-at-palmyra-atoll-pacific-remote-island-a-2001
- Zeitliche Abdeckung
- 19 February 2001 — 20 February 2001
Community-Bestätigung
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Beschreibung
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. 8 towboard surveys (17.1595 km in length), were conducted at Palmyra Atoll during the Pacific Remote Island Areas RAMP Cruise TC0101 from 30 January - 28 February 2001. 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.
Allgemeine Informationen
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Die Beschreibung der Daten befindet sich unter
http://catalog.data.gov/dataset/cred-towed-diver-benthic-characterization-surveys-at-palmyra-atoll-pacific-remote-island-a-2001 Do you think this data is incorrect? Let us know
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Die Daten werden veröffentlicht von…
National Oceanic and Atmospheric Administration, Department of Commerce Do you think this data is incorrect? Let us know
Rechtliche Information
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Die Nutzungsbestimmungen finden sich unter
http://catalog.data.gov/dataset/cred-towed-diver-benthic-characterization-surveys-at-palmyra-atoll-pacific-remote-island-a-2001 Do you think this data is incorrect? Let us know
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Under which licence can people outside the US reuse this data?
Creative Commons CCZero Do you think this data is incorrect? Let us know
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Es gibt
yes, and the rights are all held by the same person or organisation Do you think this data is incorrect? Let us know
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Die Inhalte können im Rahmen der folgenden Lizenz weiterverwendet werden
Creative Commons CCZero Do you think this data is incorrect? Let us know
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Die Daten enthalten
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Technische Hinweise
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Die Daten werden veröffentlicht unter
http://www.pifsc.noaa.gov/cred/towboard.php Do you think this data is incorrect? Let us know
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Einen Ansprechpartner zu diesen Daten finden Sie unter
http://catalog.data.gov/dataset/cred-towed-diver-benthic-characterization-surveys-at-palmyra-atoll-pacific-remote-island-a-2001 Do you think this data is incorrect? Let us know
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