Benthic cover derived from structure from motion images collected during marine debris surveys at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands from 2021-09-13 to 2021-09-14 (NCEI Accession 0253462)
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title: Benthic cover derived from structure from motion images collected during marine debris surveys at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands from 2021-09-13 to 2021-09-14 (NCEI Accession 0253462)
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abstract: The benthic cover and fishing-net related data described in this dataset are derived from the GIS analysis of benthic orthophotos. Source imagery was collected by snorkelers using a Structure from Motion (SfM) approach from at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands (NWHI). This data was collected from September 13-14, 2021 as part of a joint marine debris removal mission with the NOAA Fisheries, Ecosystem Sciences Division (ESD) and non-profit organization Papahānaumokuākea Marine Debris Project aboard the charter vessel M/V IMUA. This 2021 benthic cover dataset follows a 2018 benthic cover dataset from SfM surveys of net-impacted and paired control sites; sites were revisited in 2021 to compare the benthic composition of net-impacted sites to control sites three years after net removal. Only a subset of 2018 sites were successfully relocated in 2021, therefore new paired control sites were also included. The photographs from each site were processed using Agisoft Metashape software to generate orthomosaic images that were analyzed in ArcGIS for benthic cover using a random point approach. For net-impacted sites, twenty random points were assigned to each orthophoto within the shapefile of the 2018 net polygon overlaid in the appropriate area. For control sites, the net shapefile from 2018 was overlaid in the center of the image and 20 random points were assigned within that polygon. For all sites, each point was classified into one of six benthic categories: algae, sand, bare substrate, coral, sponge, or crustose coralline algae (CCA). The annotated points for each site were converted to percent cover for each benthic category.
purpose: The purpose of the Structure from Motion (SfM) surveys at Pearl and Hermes Atoll is to understand how derelict fishing nets alter the benthic community composition of the reef, how these impacts last over time once the net is removed, and if the benthic community can recover over time. This study leveraged SfM, an emerging photogrammetry technique, to allow efficient data collection alongside marine debris survey and removal efforts. The Papahānaumokuākea Marine National Monument (PMNM) includes the 1200 nautical mile chain of atolls and islets known as the Northwestern Hawaiian Islands (NWHI) that are geographically positioned as a repository for marine debris. Marine debris circulates within the North Pacific Subtropical Gyre until it encounters the atolls of the NWHI. The Ecosystem Sciences Division (ESD) at NOAA Fisheries has conducted both ship- and shore-based missions in the NWHI to survey for and remove derelict fishing gear and many other types of marine debris. Exploratory and opportunistic efforts began in 1996 that evolved into ~annual cruises.
credit: Related Funding Agency: NOAA Marine Debris Program
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title: Pacific Islands Fisheries Science Center, 2022: Benthic cover derived from structure from motion images collected during marine debris surveys at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands from missions in 2018 and 2021, https://www.fisheries.noaa.gov/inport/item/59172.
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title: Suka, R., Huntington, B., Morioka, J., O’Brien, K., & Acoba, T. (2020). Successful application of a novel technique to quantify negative impacts of derelict fishing nets on Northwestern Hawaiian Island reefs. Marine Pollution Bulletin, 157, 111312. https://doi.org/10.1016/j.marpolbul.2020.111312
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title: Burns, J., Delparte, D., Gates, R., & Takabayashi, M. (2015). Integrating structure-from-motion photogrammetry with geospatial software as a novel technique for quantifying 3D ecological characteristics of coral reefs. PeerJ, 3, e1077. https://doi.org/10.7717/peerj.1077
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title: Donohue, M. J., Boland, R. C., Sramek, C. M., & Antonelis, G. A. (2001). Derelict Fishing Gear in the Northwestern Hawaiian Islands: Diving Surveys and Debris Removal in 1999 Confirm Threat to Coral Reef Ecosystems. Marine Pollution Bulletin, 42(12), 1301–1312. https://doi.org/10.1016/s0025-326x(01)00139-4
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title: Suka, R., Asbury, M., Gray, A. E., Winston, M., Oliver, T. (T. A., & Couch, C. S. (2019). Processing Photomosaic Imagery of Coral Reefs Using Structure-from-Motion Standard Operating Procedures. Pacific Islands Fisheries Science Center (U.S.). https://doi.org/10.25923/h2q8-jv47
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beginPosition: 2021-09-13
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supplementalInformation: Submission Package ID: 4KDA2E Note: The dataset abstract references source imagery. These images were not included with this submission. In this accession, NCEI has archived multiple versions of these data. The latest (and best) version of these data has the largest version number.
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description: Parameter or Variable: REEF AND/OR BOTTOM REGIME - PERCENT COVER (calculated); Units: percent; Observation Category: derived products; Sampling Instrument: photograph; Sampling and Analyzing Method: Orthomosaics from net-impacted sites and paired controls were assessed for benthic cover using ArcMap 10.6.1. For each impact site, a shapefile of the net boundary delineated by Suka et al. in 2020 was overlaid and repositioned on the recent orthophotos to align with the original location of the derelict net. For control sites, the same boundary shapefile was overlaid in the center of the orthophoto. The benthic cover at each control and impact site site was assessed from 20 random points placed within the net boundary shapefile of each orthophoto. The benthic feature under each point was then classified into one of six benthic categories: algae (grouping turf and macroalgae), sand, bare, coral, sponge, and crustose coralline algae (CCA) and then converted to percent cover for the site.; Data Quality Method: Representativeness: The data set derived from the image analysis is as good as the mosaic image itself; points that fell within areas of low contrast, shadow, obstruction, or blur were discarded. Accuracy: Prior to conducting surveys, researchers are trained to identify benthic taxa. Both classroom and field training were completed for all researchers (experienced and inexperienced alike) before any surveys were conducted. This training ensures that all analysis is conducted consistently by all analysts..
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acquisitionInformation: (MI_AcquisitionInformation)
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code: photograph
type: photograph
description: still images used as the basis for making parameter determinations
