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

Description

The benthic cover and fishing-net related data described in this dataset are derived from the GIS analysis of benthic orthophotos. The source imagery was collected by snorkelers using a Structure from Motion (SfM) approach during swim surveys in search of derelict fishing nets. Surveys were conducted by the NOAA Fisheries, Ecosystem Sciences Division (ESD) at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands (NWHI). Initial surveys occurred from September 24 - October 3, 2018 during an ESD-led marine debris removal mission aboard the NOAA Ship Oscar Elton Sette, and follow-up surveys occurred from September 13-14, 2021 on a joint mission with non-profit organization Papahanaumokuakea Marine Debris Project aboard the M/V IMUA. During the 2018 mission, fishing nets were located during swim surveys and selected for SfM if the net was interacting with coral or hard substrate, the depth of the net was within ~1 - 4 m of the surface, and the area of the net fit within the 9 sq. meter SfM survey plot. During the SfM survey, a permanent 3 x 3 m plot was established around the center of the fishing net, and the net was photographed using a back and forth swim pattern ("before" photos) for later processing using a SfM approach. The net was then removed, the volume of net removed was estimated and recorded, and the same area was photographed again in the same way ("after" photos). A nearby (>50 m distant) paired control site was also photographed using the same method ("control" photos). During the 2021 mission, we attempted to relocate all paired sites where "after" and "control" photos were taken in 2018 and if found, we reimaged the permanent 3 x 3m plot using the same SfM approach. Only a subset of 2018 sites were successfully relocated in 2021 (12 "after" sites, 8 "control" sites), and five new nearby "control" sites had to be established to fulfill our paired study design. 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. In 2018, the number of points at net-impacted sites were constrained to the net coverage area and were scaled to the net area to ensure an equal point density among replicate net-impact sites. The same number of points were randomly assigned to the 3 by 3 m paired control site. In 2021, twenty random points were assigned to each orthophoto within the 2018 net polygon. Each point was classified into one of seven benthic categories: turf algae, macroalgae, sand, bare substrate, Porites compressa, sponge, or crustose coralline algae (CCA). In 2021, turf and macroalgae categories were merged into a single algae category and all coral species were assigned the coral category. The annotated points for each site were converted to percent cover for each benthic category. Fishing net size (sq. m) and degree of fouling were also calculated from the initial "before" orthophotos. Analyses were conducted to compare the benthic composition of net sites to control sites and to determine if fouling or net size contributed to these differences.

Resources

Name Format Description Link
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/59172
0 Pacific Island Fisheries Science Center homepage https://www.pifsc.noaa.gov
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/pifsc/dmp/pdf/59172.pdf
0 Link to online publication on journal website. https://doi.org/10.1016/j.marpolbul.2023.114703
0 Benthic cover data from marine debris surveys conducted at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2021. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division. Data include fishing net area and weight, and percent benthic cover data derived from structure from motion images collected during the marine debris surveys. https://accession.nodc.noaa.gov/0253462
0 Benthic cover data from marine debris surveys conducted at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2018. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division. Data include fishing net area and weight, and percent benthic cover data derived from structure from motion images collected during the marine debris surveys and processed using a structure from motion approach. https://accession.nodc.noaa.gov/0209247
0 Information about marine debris research and removal efforts in Northwestern Hawaiian Islands by Pacific Islands Fisheries Science Center https://www.fisheries.noaa.gov/pacific-islands/marine-debris-research-and-removal-northwestern-hawaiian-islands
0 Story map about marine debris removal efforts in 2018 with images and captions describing work that was conducted. https://noaa.maps.arcgis.com/apps/MapTour/index.html?appid=852aeea527834cfbbc53248850065b4a
0 Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Benthic cover data from marine debris surveys conducted at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2018. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division. Data include fishing net area and weight, and percent benthic cover data derived from structure from motion images collected during the marine debris surveys and processed using a structure from motion approach. https://accession.nodc.noaa.gov/0209247
0 Benthic cover data from marine debris surveys conducted at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2021. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division. Data include fishing net area and weight, and percent benthic cover data derived from structure from motion images collected during the marine debris surveys. https://accession.nodc.noaa.gov/0253462
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/59172
0 Pacific Island Fisheries Science Center homepage https://www.pifsc.noaa.gov
0 Information about marine debris research and removal efforts in Northwestern Hawaiian Islands by Pacific Islands Fisheries Science Center https://www.fisheries.noaa.gov/pacific-islands/marine-debris-research-and-removal-northwestern-hawaiian-islands
0 Link to online publication on journal website. https://doi.org/10.1016/j.marpolbul.2023.114703
0 Story map about marine debris removal efforts in 2018 with images and captions describing work that was conducted. https://noaa.maps.arcgis.com/apps/MapTour/index.html?appid=852aeea527834cfbbc53248850065b4a
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/pifsc/dmp/pdf/59172.pdf
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/59172
0 Benthic cover data from marine debris surveys conducted at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2018. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division. Data include fishing net area and weight, and percent benthic cover data derived from structure from motion images collected during the marine debris surveys and processed using a structure from motion approach. https://accession.nodc.noaa.gov/0209247
0 Benthic cover data from marine debris surveys conducted at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2021. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division. Data include fishing net area and weight, and percent benthic cover data derived from structure from motion images collected during the marine debris surveys. https://accession.nodc.noaa.gov/0253462
0 Pacific Island Fisheries Science Center homepage https://www.pifsc.noaa.gov
0 Information about marine debris research and removal efforts in Northwestern Hawaiian Islands by Pacific Islands Fisheries Science Center https://www.fisheries.noaa.gov/pacific-islands/marine-debris-research-and-removal-northwestern-hawaiian-islands
0 Link to online publication on journal website. https://doi.org/10.1016/j.marpolbul.2023.114703
0 Story map about marine debris removal efforts in 2018 with images and captions describing work that was conducted. https://noaa.maps.arcgis.com/apps/MapTour/index.html?appid=852aeea527834cfbbc53248850065b4a
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/pifsc/dmp/pdf/59172.pdf

Tags

  • crep
  • coral cover
  • doc/noaa/nmfs/pifsc
  • structure from motion
  • united states of america
  • reef monitoring and assessment
  • aquatic habitat
  • coral reef
  • corals
  • north pacific ocean
  • benthic habitat
  • coral reef ecosystem division
  • benthic
  • ecosystems
  • phr
  • pifsc
  • biosphere
  • photographic analysis
  • pearl and hermes
  • oceans
  • algae
  • oscar elton sette
  • benthic cover
  • reef and/or bottom regime - percent cover
  • marine debris
  • sfm
  • continent
  • pmnm
  • papahanaumokuakea marine national monument
  • noaa
  • m/v imua
  • numeric data sets
  • algal cover
  • hawaii
  • nmfs
  • marine ecosystems
  • sponges
  • north america
  • us doc
  • debris
  • in situ
  • pacific islands fisheries science center
  • u.s. department of commerce
  • earth science
  • national marine fisheries service
  • bathymetry/seafloor topography
  • derelict fishing gear
  • nwhi
  • reef damage assessment
  • ocean
  • vegetation
  • fleshy macroalgae
  • hawaiian islands
  • crustose coralline algae
  • pearl and hermes reef (27n176w0001)
  • marine biology
  • cred
  • marine submerged debris
  • honolulu
  • marine environment monitoring
  • northwestern hawaiian islands (28n178w0000)
  • fishing nets
  • central pacific ocean
  • photograph
  • reef habitat
  • derived products
  • coral reef ecology
  • ocean basin
  • ecosystem sciences division
  • coral
  • esd
  • coastal processes
  • northwestern hawaiian islands
  • hard seafloor substrate
  • reef
  • zoology
  • coral reefs
  • pacific ocean
  • country/territory
  • scale
  • marine debris program
  • turf algae
  • coral reef studies
  • coral reef ecosystem program

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