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Benthic cover data collected at High Priority Reef Areas by the Guam Long-term Coral Reef Monitoring Program from 2010-08-04 to 2024-11-19 (NCEI Accession 0285768)

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: January 26, 2026 | Last Modified: 2025-05-20T00:00:00.000+00:00
The data in this package include benthic percent cover data collected at High Priority Reef Areas by the Guam Long-term Coral Reef Monitoring Program (GLTMP). These data were generated through the analysis of images obtained by benthic photo transect surveys at numerous sampling stations (= one transect) within the boundaries of each HPRA. Benthic cover estimates were initially derived from photo transect images using Coral Point Count with Excel extensions (CPCe; Kohler and Gill 2006) point sampling software, but the web-based image analysis platform CoralNet (Beijborn et al. 2012, Beijborn 2015) was used beginning with the 2019 images. These data were collected using a split-panel sampling approach, whereby a mix of permanent and non-permanent sampling stations (one sampling station = one transect) are visited within each HPRA. The HPRAs were selected by an advisory body comprised of reef managers, researchers, and technicians. The sites were not selected randomly from around the island and thus should not be considered representative of reef condition at the island-scale. While the general location of the HPRAs were selected based on management priority, the site boundaries were delineated using bathymetry and benthic habitat data within ArcGIS; the locations of the sampling stations were generated randomly within each site’s boundaries using ArcGIS. The benthic photo transect surveys, as well as reef fish SPC, macroinvertebrate belt transect, and rugosity surveys are carried out on an annual basis along the seaward slope between 7 and 15 m depth in the Tumon Bay Marine Preserve and in East Agana Bay, while surveys are carried out biennially within the Piti Bomb Holes Marine Preserve, the Achang Reef Flat Marine Preserve, the eastern side of the Cocos Barrier Reef (Cocos-East), and Fouha Bay. Surveys were also carried at along reef margin (1-2 m) and slope (2-15 m) of Western Shoals, in Apra Harbor, in 2011. The GLTMP has conducted surveys at the Tumon and East Agana HPRAs since 2010 and the Piti HPRA since 2012. Data collection for the Achang and Cocos-East HPRAs began in 2014 and at the Fouha Bay HPRA in 2015. Baseline data is available for the Western Shoals HPRA from 2011 but this site has not been revisited since its establishment due to shifting management priorities. Newly generated annotations are acquired from CoralNet and integrated with a master benthic cover data set using a custom R script. These data do not contain zero counts for benthic classes not observed at a given sampling station, but zero counts should be accounted for when calculating mean values for parameters across sampling stations (e.g., by using the expand_grid function in R). Note that while the SURVEY_YEAR value is generally consistent with the SURVEY_DATE, the SURVEY_YEAR value for several sampling stations in the Piti HPRA is not consistent with the SURVEY_DATE. These stations were surveyed in November and December of 2017, but surveys at the remainder of the sampling stations were completed between March and August of 2018. The SURVEY_YEAR was changed to 2018 for the stations surveyed in late 2017 in order to allow these stations to be considered together in a time series analysis.

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0285768 BENTHIC COMMUNITIES BENTHIC SPECIES biological data CORAL HABITAT - BENTHIC INVERTEBRATE SPECIES MACROALGAE SPECIES IDENTIFICATION photograph benthic derived products in situ University of Guam University of Guam Coral Reef Conservation Program (CRCP) CORAL REEF STUDIES Philippine Sea oceanography GLTMP Guam Bureau of Statistics and Plans Guam Long-term Coral Reef Monitoring Program NOAA Pacific Islands Regional Office The Guam Coastal Management Program University of Guam Marine Laboratory NA07NOS4260060 NA10NOS4260060 NA11NOS4820007 NA13NOS4820012 NA15NOS4820039 NA17NOS4820038 NA19NOS4820057 NA21NOS4820018 NA23NOS4820147 State and Territorial Government Cooperative Agreements Comprehensive Long-term Coral Reef Monitoring at Permanent Sites on Guam Numeric Data Sets > Benthic EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat EARTH SCIENCE > Biosphere > Aquatic Habitat > Reef Habitat EARTH SCIENCE > Biosphere > Microbiota > Blue-green Algae EARTH SCIENCE > Biosphere > Microbiota > Cyanobacteria EARTH SCIENCE > Biosphere > Vegetation > Algae > Algal Cover EARTH SCIENCE > Biosphere > Vegetation > Algae > Crustose Coralline Algae EARTH SCIENCE > Biosphere > Vegetation > Algae > Encrusting Macroalgae EARTH SCIENCE > Biosphere > Vegetation > Algae > Turf Algae EARTH SCIENCE > Biosphere > Zoology > Corals EARTH SCIENCE > Biosphere > Zoology > Corals > Coral Diseases > Bleaching EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Benthos Analysis EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Benthos Analysis > Quadrat Monitoring > Photograph Analysis EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Benthos Analysis > Transect Monitoring EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > In Situ Biological EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Photographic Analysis EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Rapid Assessment Studies EARTH SCIENCE > Biosphere > Zoology > Mollusks > Tridacna EARTH SCIENCE > Biosphere > Zoology > Sponges EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology > Benthic biology EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology > Coral Cover EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology > Hard Coral Cover EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology > Hard Coral Cover Live percentage EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology > Octocoral Cover EARTH SCIENCE > Oceans > Marine Biology > Coral EARTH SCIENCE > Oceans > Marine Biology > Coral Communities EARTH SCIENCE > Oceans > Marine Biology > Marine Invertebrates EARTH SCIENCE > Oceans > Marine Biology > Marine Invertebrates > Macroinvertebrates EARTH SCIENCE > Oceans > Marine Biology > Marine Plants > Seagrass EARTH SCIENCE > BIOLOGICAL CLASSIFICATION EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MACROALGAE (SEAWEEDS) EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES > COASTAL LANDFORMS > CORAL REEFS Benthic Cover Coral Reef Ecosystem REA Rapid Ecological Assessments CoralNet digital camera COUNTRY/TERRITORY > United States of America > Guam > Achang (13N144E0064) COUNTRY/TERRITORY > United States of America > Guam > Cocos Barrier Reefs (13N144E0001) COUNTRY/TERRITORY > United States of America > Guam > East Agana Bay (13N144E0063) COUNTRY/TERRITORY > United States of America > Guam > Fouha Bay (13N144E0024) COUNTRY/TERRITORY > United States of America > Guam > Guam (13N144E0000) COUNTRY/TERRITORY > United States of America > Guam > Piti Bay (13N144E0061) COUNTRY/TERRITORY > United States of America > Guam > Piti Bomb Hole (13N144E0052) COUNTRY/TERRITORY > United States of America > Guam > Tumon Bay (13N144E0004) COUNTRY/TERRITORY > United States of America > Guam > Western Shoal (13N144E0062) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Achang (13N144E0064) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > East Agana Bay (13N144E0063) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Fouha Bay (13N144E0024) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Guam (13N144E0000) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Piti Bay (13N144E0061) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Piti Bomb Hole (13N144E0052) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Tumon Bay (13N144E0004) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Western Shoal (13N144E0062) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam Reefs > Cocos Barrier Reefs (13N144E0001) OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN 6NJRLF HGNXKW

Complete Metadata
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describedByType application/octet-steam
description The data in this package include benthic percent cover data collected at High Priority Reef Areas by the Guam Long-term Coral Reef Monitoring Program (GLTMP). These data were generated through the analysis of images obtained by benthic photo transect surveys at numerous sampling stations (= one transect) within the boundaries of each HPRA. Benthic cover estimates were initially derived from photo transect images using Coral Point Count with Excel extensions (CPCe; Kohler and Gill 2006) point sampling software, but the web-based image analysis platform CoralNet (Beijborn et al. 2012, Beijborn 2015) was used beginning with the 2019 images. These data were collected using a split-panel sampling approach, whereby a mix of permanent and non-permanent sampling stations (one sampling station = one transect) are visited within each HPRA. The HPRAs were selected by an advisory body comprised of reef managers, researchers, and technicians. The sites were not selected randomly from around the island and thus should not be considered representative of reef condition at the island-scale. While the general location of the HPRAs were selected based on management priority, the site boundaries were delineated using bathymetry and benthic habitat data within ArcGIS; the locations of the sampling stations were generated randomly within each site’s boundaries using ArcGIS. The benthic photo transect surveys, as well as reef fish SPC, macroinvertebrate belt transect, and rugosity surveys are carried out on an annual basis along the seaward slope between 7 and 15 m depth in the Tumon Bay Marine Preserve and in East Agana Bay, while surveys are carried out biennially within the Piti Bomb Holes Marine Preserve, the Achang Reef Flat Marine Preserve, the eastern side of the Cocos Barrier Reef (Cocos-East), and Fouha Bay. Surveys were also carried at along reef margin (1-2 m) and slope (2-15 m) of Western Shoals, in Apra Harbor, in 2011. The GLTMP has conducted surveys at the Tumon and East Agana HPRAs since 2010 and the Piti HPRA since 2012. Data collection for the Achang and Cocos-East HPRAs began in 2014 and at the Fouha Bay HPRA in 2015. Baseline data is available for the Western Shoals HPRA from 2011 but this site has not been revisited since its establishment due to shifting management priorities. Newly generated annotations are acquired from CoralNet and integrated with a master benthic cover data set using a custom R script. These data do not contain zero counts for benthic classes not observed at a given sampling station, but zero counts should be accounted for when calculating mean values for parameters across sampling stations (e.g., by using the expand_grid function in R). Note that while the SURVEY_YEAR value is generally consistent with the SURVEY_DATE, the SURVEY_YEAR value for several sampling stations in the Piti HPRA is not consistent with the SURVEY_DATE. These stations were surveyed in November and December of 2017, but surveys at the remainder of the sampling stations were completed between March and August of 2018. The SURVEY_YEAR was changed to 2018 for the stations surveyed in late 2017 in order to allow these stations to be considered together in a time series analysis.
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identifier gov.noaa.nodc:0285768
issued 2023-12-01T00:00:00.000+00:00
keyword 
                                            [
  "0285768",
  "BENTHIC COMMUNITIES",
  "BENTHIC SPECIES",
  "biological data",
  "CORAL",
  "HABITAT - BENTHIC",
  "INVERTEBRATE SPECIES",
  "MACROALGAE",
  "SPECIES IDENTIFICATION",
  "photograph",
  "benthic",
  "derived products",
  "in situ",
  "University of Guam",
  "University of Guam",
  "Coral Reef Conservation Program (CRCP)",
  "CORAL REEF STUDIES",
  "Philippine Sea",
  "oceanography",
  "GLTMP",
  "Guam Bureau of Statistics and Plans",
  "Guam Long-term Coral Reef Monitoring Program",
  "NOAA Pacific Islands Regional Office",
  "The Guam Coastal Management Program",
  "University of Guam Marine Laboratory",
  "NA07NOS4260060",
  "NA10NOS4260060",
  "NA11NOS4820007",
  "NA13NOS4820012",
  "NA15NOS4820039",
  "NA17NOS4820038",
  "NA19NOS4820057",
  "NA21NOS4820018",
  "NA23NOS4820147",
  "State and Territorial Government Cooperative Agreements",
  "Comprehensive Long-term Coral Reef Monitoring at Permanent Sites on Guam",
  "Numeric Data Sets > Benthic",
  "EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat",
  "EARTH SCIENCE > Biosphere > Aquatic Habitat > Reef Habitat",
  "EARTH SCIENCE > Biosphere > Microbiota > Blue-green Algae",
  "EARTH SCIENCE > Biosphere > Microbiota > Cyanobacteria",
  "EARTH SCIENCE > Biosphere > Vegetation > Algae > Algal Cover",
  "EARTH SCIENCE > Biosphere > Vegetation > Algae > Crustose Coralline Algae",
  "EARTH SCIENCE > Biosphere > Vegetation > Algae > Encrusting Macroalgae",
  "EARTH SCIENCE > Biosphere > Vegetation > Algae > Turf Algae",
  "EARTH SCIENCE > Biosphere > Zoology > Corals",
  "EARTH SCIENCE > Biosphere > Zoology > Corals > Coral Diseases > Bleaching",
  "EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment",
  "EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Benthos Analysis",
  "EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Benthos Analysis > Quadrat Monitoring > Photograph Analysis",
  "EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Benthos Analysis > Transect Monitoring",
  "EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > In Situ Biological",
  "EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Photographic Analysis",
  "EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Rapid Assessment Studies",
  "EARTH SCIENCE > Biosphere > Zoology > Mollusks > Tridacna",
  "EARTH SCIENCE > Biosphere > Zoology > Sponges",
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  "EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology",
  "EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology > Benthic biology",
  "EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology > Coral Cover",
  "EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology > Hard Coral Cover",
  "EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology > Hard Coral Cover Live percentage",
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  "EARTH SCIENCE > Oceans > Marine Biology > Marine Plants > Seagrass",
  "EARTH SCIENCE > BIOLOGICAL CLASSIFICATION",
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  "EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC",
  "EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES > COASTAL LANDFORMS > CORAL REEFS",
  "Benthic Cover",
  "Coral Reef Ecosystem",
  "REA",
  "Rapid Ecological Assessments",
  "CoralNet",
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  "COUNTRY/TERRITORY > United States of America > Guam > Achang (13N144E0064)",
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  "COUNTRY/TERRITORY > United States of America > Guam > East Agana Bay (13N144E0063)",
  "COUNTRY/TERRITORY > United States of America > Guam > Fouha Bay (13N144E0024)",
  "COUNTRY/TERRITORY > United States of America > Guam > Guam (13N144E0000)",
  "COUNTRY/TERRITORY > United States of America > Guam > Piti Bay (13N144E0061)",
  "COUNTRY/TERRITORY > United States of America > Guam > Piti Bomb Hole (13N144E0052)",
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  "OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Guam (13N144E0000)",
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  "OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Piti Bomb Hole (13N144E0052)",
  "OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Tumon Bay (13N144E0004)",
  "OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Western Shoal (13N144E0062)",
  "OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam Reefs > Cocos Barrier Reefs (13N144E0001)",
  "OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN",
  "6NJRLF",
  "HGNXKW"
]
landingPage https://www.ncei.noaa.gov/contact
language 
                                            []
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2025-05-20T00:00:00.000+00:00
publisher 
                                            {
  "name": "NOAA National Centers for Environmental Information",
  "@type": "org:Organization"
}
references 
                                            [
  "https://www.fisheries.noaa.gov/inport/item/47784",
  "https://guamcoralreefmonitoring.wordpress.com/",
  "https://www.guamcoralreefs.info",
  "https://repository.library.noaa.gov/view/noaa/29489",
  "https://www.uog.edu/_resources/files/ml/technical_reports/UOGML_TechRep170_GLTMP_2023.pdf"
]
rights otherRestrictions
spatial 144.798279,13.236,144.653677,13.516778
temporal 2010-08-04T00:00:00+00:00/2024-11-19T00:00:00+00:00
title Benthic cover data collected at High Priority Reef Areas by the Guam Long-term Coral Reef Monitoring Program from 2010-08-04 to 2024-11-19 (NCEI Accession 0285768)

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