National Coral Reef Monitoring Program: Benthic Cover from Annotated Benthic Images Collected During Photoquadrat Surveys at Climate Stations across the Mariana Archipelago since 2014

This data has been combined into a US Pacific-wide InPort record:  https://www.fisheries.noaa.gov/inport/item/78600.

The coral reef benthic community data described here result from the annotation (classification) of benthic images collected during photoquadrat surveys conducted by the NOAA Pacific Islands Fisheries Science Center (PIFSC), Ecosystem Sciences Division (ESD, formerly the Coral Reef Ecosystem Division) as part of NOAA's ongoing National Coral Reef Monitoring Program (NCRMP). The photoquadrat surveys were conducted at coral reef sites according to protocols established by ESD and NCRMP during ESD-led NCRMP missions to the islands of the Mariana Archipelago in 2014, 2017, and 2022.

SCUBA divers conducted benthic photoquadrat surveys at permanent sites established in coral reef habitats by ESD. A select number of these sites were chosen in hard-bottom habitat at ~15-m depths, and a subset of the permanent sites (climate stations) were established at north, south, east, and west points around each of the islands. The divers estimated and delineated each site's rectangular perimeter by temporarily placing measuring tapes with 1-m markers starting from a permanently installed reference stake on the reef. Along the nearshore 10-m side of the survey site and the downslope 5-m side, the measuring tapes marked every meter of the L-shaped 15-m transect used for photoquadrat documentation. The divers photographed the reef at 1-m intervals on both sides of the 15-m tape, generating 20-30 photographs per survey site.

The benthic habitat images were quantitatively analyzed using Coral Point Count with Excel extensions (CPCe; Kohler and Gill, 2006) software from 2010-2014 and the web-based annotation tool, CoralNet (Beijbom et al. 2015), from 2015 to present. Ten points were randomly overlaid on each image and human analysts identified the organism or type of substrate beneath, with 300 annotations (points) generated per site. Benthic elements falling under each point were identified to genus/morphology for hard corals, and to genus/functional group for algae, invertebrates, and other taxa following Lozada-Misa et al. (2017). In general, the analysis resulted in three levels of benthic community data, including taxa group (Tier 1: hard coral, soft coral, macroalgae, turf algae, etc.), morphology (Tier 2: massive, branching, upright macroalgae, etc.), and genus (Tier 3). These benthic data can ultimately be used to produce estimates of relative abundance (percentage of benthic cover), frequency of occurrence, benthic community taxonomic composition, and relative generic richness.

Tags: 743, algae, aquatic habitat, asuncion island, asuncion island (19n145e0001), benthic, benthic biology, benthic communities, benthic habitat, benthic species, benthic species - taxa counts, benthic species - taxa identities, benthos analysis, biological, biosphere, blue-green algae, climate change, cnmi, coastal processes, commonwealth of the northern mariana islands, community dynamics, coral, coral - species identification, coral communities, coral reef, coral reef conservation program, coral reef ecology, coral reef ecosystem division, coral reef ecosystem program, coral reef studies, coral reefs, corals, country/territory, cred, crep, crustose coralline algae, doc/noaa/nmfs/pifsc, doc/noaa/nmfs/pifsc/esd, earth science, ecological dynamics, ecosystem sciences division, ecosystems, encrusting macroalgae, esd, guam, guam (13n144e0000), habitat - benthic, hi'ialakai, laboratory analyses, macroinvertebrates, mariana archipelago, marianas, marianas archipelago, marianas trench marine national monument, marine biology, marine ecosystems, marine invertebrates, maug, maug island, maug island (20n145e0001), microbiota, micronesia, national coral reef monitoring program, national marine fisheries service, nmfs, noaa, noaa ship rainier, northern mariana islands, northern mariana islands ( cnmi ) (18n146e0000), numeric data sets, nw pacific (limit-180), ocean, ocean basin, ocean chemistry, oceans, pacific islands fisheries science center, pacific ocean, pacific reef and assessment monitoring program, pagan, pagan island, pagan island (18n145e0001), photograph, photographic analysis, pifsc, ramp, reef, reef assessment and monitoring program, reef habitat, reef monitoring and assessment, rota, rota island, rota island ( luta ) (14n145e0007), saipan, saipan island, saipan island (15n145e0002), tinian, tinian island (14n145e0005), tinian island reefs, turf algae, u.s. department of commerce, united states of america, us doc, vegetation, visual estimate, western pacific ocean, zoology
Organization: National Oceanic and Atmospheric Administration, Department of Commerce