Benthic Surveys in Aua, American Samoa: benthic images collected during belt transect surveys from 2022-09-12 to 2022-09-22 (NCEI Accession 0270551)
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title: Benthic Surveys in Aua, American Samoa: benthic images collected during belt transect surveys from 2022-09-12 to 2022-09-22 (NCEI Accession 0270551)
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abstract: This dataset describes the imagery collected in 2022 of Aua Reef, American Samoa by the Ecosystem Sciences Division (ESD) of NOAA, funded by the Coral Reef Conservation Program (CRCP), to study effects of land-based source pollution by establishing biological, physical, and chemical baselines. In September 2022, NOAA scientists conducted benthic survey protocols at 18 study sites in Aua, American Samoa. The surveys implemented a one-stage stratified random sampling (StRS) design and the survey domain encompassed the majority of the mapped area of reef and hard bottom habitats in the 0 to 6 m depth range. Photoquadrat benthic images were collected along belt transect surveys of coral demography according to protocols established by NOAA National Coral Reef Monitoring Program (NCRMP) in 2015. Thirty images were collected along one, haphazardly laid, 30-m transects. Still photographs were collected to record the benthic community composition at predetermined points along belt transect with a high-resolution digital camera mounted on a pole. Photographs were taken every 1 m from the 1 m to the 30 m mark. This work generates 30 photographs per site, which are later analyzed by ESD staff and partners using the computer program CoralNet. This analysis is the basis for estimating benthic cover and composition at each site, which is documented and archived separately. The StRS design effectively reduces estimate variance through stratification using environmental covariates and by sampling more sites rather than more transects per site. Therefore, site-to-site comparisons should proceed with caution.
purpose: This imagery is analyzed to produce benthic cover estimates which are archived and documented separately. This baseline assessment for land-based sources of pollution on Aua reef is part of a larger Coral Reef Conservation Program (CRCP) funded project ID 31303: "Linking watershed management activities to reef health in American Samoa", and builds upon prior baseline and status and trends assessments conducted in 2012, 2015, and 2020 in Faga'alu Bay (U.S. Task Force watershed priority site) and Vatia (Territorial priority watershed) to address National and Jurisdictional goals to reduce land-based sources of pollution impacts in coral reef ecosystems. Data was generated from benthic surveys of Aua reef to establish a comprehensive biological baseline, for land-based sources of pollution impacts on benthic composition and coral demographics. These efforts feed into the higher-level CRCP objectives by establishing an in-situ tracking system to assess the effects of management and mitigation strategies and activities in the target watersheds to reduce land-based sources of pollution impacts on coral reefs. Conductivity-Temperature-Depth (CTD) profiles as well as water samples were also collected as part of this baseline assessment for the analysis of particulate and dissolved nutrients, total suspended solids, chlorophyll-a, and seawater pH and Alkalinity. These data are documented and archived separately.
credit: Related Funding Agency: US DOC; NOAA; NOS; Coral Reef Conservation Program
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title: Ecosystem Sciences Division, Pacific Islands Fisheries Science Center (2022). Benthic Surveys in Aua, American Samoa: benthic cover derived from analysis of benthic images collected during belt transect surveys of coral demography from 2022-09-12 to 2022-09-22 (NCEI Accession 0275987). NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0275987.
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beginPosition: 2022-09-12
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supplementalInformation: Submission Package ID: N8TM6A
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description: NCEI Accession 0270551 v1.1 was published.
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DateTime: 2023-01-30T13:56:24Z
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dataQualityInfo: (DQ_DataQuality)
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description: Parameter or Variable: PHOTOQUADRAT IMAGES (measured); Units: N/A; Observation Category: in situ; Sampling Instrument: camera; Sampling and Analyzing Method: Photoquadrat surveys were conducted along one, 30 meter transect per site. Photos of the benthic substrate were taken at one meter intervals starting at meter 1, along the left hand side of the transect (30 images/transect; 30 images total); Data Quality Method: Benthic Image collection was conducted by experienced benthic survey personnel who have been trained. Handheld GPS units were used to mark site locations. An optical validation QC procedure is employed to verify number of images, per site and file name. Image color correction is also implemented to improve image quality..
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acquisitionInformation: (MI_AcquisitionInformation)
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type: camera
description: An instrument for recording images.
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