59257 SfM Debris: benthic cover Entity Published / External 59172 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 Data Set Completed 2020-03-30 2022 Spreadsheet Yes Spreadsheet data including net-impact (A), and control site (C) information for substrate percent cover (bare, calcium carbonate algae, macroalgae, Porites compressa, sand, turf, sponge) and net area derived from the Structure from Motion imagery as well as net weight. Null data cells or those populated with 'NA' represent data that was not collected. In 2021, columns PC_TURF (percent cover of turf) and PC_MACRO (percent cover of macroalgae) were merged (summed) to create PC_ALGAE (percent cover of all algae). Also in 2021, the column PC_PCOM was renamed to PC_CORAL due to species other than Porites compressa being encountered, and represents the percent cover of all coral taxa present. PC_SAND NUMERIC No No Active Benthic cover category: sand (0-100%). The sum of this and the other benthic categories totals 100%. Site TEXT No No Active Site name. Treatment TEXT No No Active Treatment type, A = net-impact site, C = control site. UniqID TEXT No No Active Unique identifier for survey site. PC_SPONGE NUMERIC No No Active Benthic cover category: sponges (0-100%). The sum of this and the other benthic categories totals 100%. PC_ALGAE NUMERIC No No Active Benthic cover category: all algae (turf and macroalgae combined) (0-100%). PC_CCA NUMERIC No No Active Benthic cover category: crustose coralline algae (0-100%). The sum of this and the other benthic categories totals 100%. PC_BARE NUMERIC No No Active Benthic cover category: bare substrate (0-100%). The sum of this and the other benthic categories totals 100%. PC_CORAL NUMERIC No No Active Benthic cover category: coral, all taxa (0-100%). The sum of this and the other benthic categories totals 100%. PC_PCOM changed to PC_CORAL in 2021 as other coral taxa besides Porites compressa were encountered. Fouling_Code NUMERIC No No Active Fouling value assigned to each net. Fouling scores ranged from 1 to 3, where 1 = Light: 1–40% of net surface area covered, 2 = Moderate: 41–75% of net surface area covered, and 3 = Heavy: >75% of net surface area covered. Not applicable to control sites (TREATMENT = 'C') and not collected in 2021 after net removal. Net_wt_kg NUMERIC No No Active Weight of net in kilograms. Not applicable to control sites (TREATMENT = 'C') and not collected in 2021 after net removal. Analysis_pair NUMERIC No No Active Number to associate each net-impact site with paired control site. Net_area_m2 NUMERIC No No Active Area of net on substrate in square meters, calculated in GIS from the orthomosaic generated from the photographs. Not applicable to control sites (TREATMENT = 'C') and not collected in 2021 after net removal. 1 DATE DATE No No Active Date of structure from motion survey (m/d/yyyy). 2 LAT NUMERIC No No Active Latitude in decimal degrees of structure from motion survey site. 3 LON NUMERIC No No Active Longitude in decimal degrees of structure from motion survey site. 4 DEPTH_MIN_M NUMERIC No No Active Minimum depth in meters of the 4 corners of the 3 x 3 m plot used to capture overlapping images processed using a Structure from Motion approach. 5 DEPTH_MAX_M NUMERIC No No Active Maximum depth in meters of the 4 corners of the 3 x 3 m plot used to capture overlapping images processed using a Structure from Motion approach. 6 DEPTH_AVG_M NUMERIC No No Active Average depth in meters of the 4 corners of the 3 x 3 m plot used to capture overlapping images to be processed using a Structure from Motion approach. gov.noaa.nmfs.inport:59257 Annette DesRochers 2020-04-08T18:31:51 Lori Luers 2023-02-11T02:46:31 2023-02-11 Pacific Islands Fisheries Science Center PIFSC 1845 Wasp Blvd. Honolulu HI 96818 USA 808-725-5300 https://www.pifsc.noaa.gov 8:00 a.m. - 4:30 p.m. 1001 Public No 2022-05-09 1 Year 2023-05-09