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Assessing and monitoring cryptic reef diversity of colonizing marine invertebrates across the U.S.-affiliated islands and atolls in the Pacific since 2008 using the Autonomous Reef Monitoring Structure (ARMS) method

Published by Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA) | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: January 27, 2026 | Last Modified: 2010-11-22T00:00:00.000+00:00
To support a long-term program for sustainable management and conservation of coral reef ecosystems, from 2008, Autonomous Reef Monitoring Structures (ARMS) have been deployed and/or recovered across the U.S. Such cruises are conducted at two to three year intervals by the Coral Reef Ecosystem Division (CRED) at the NOAA Pacific Islands Fisheries Science Center (PIFSC). CRED partnered with other scientists from the Census of Marine Life (CoML) Census of Coral Reef Ecosystems (CReefs) to develop Autonomous Reef Monitoring Structures (ARMS). ARMS mimic the complexity of coral reefs to attract/collect colonizing invertebrates and provide a systematic, consistent, and comparable method to monitor cryptic reef diversity. The key innovation of this method is that ARMS sample biodiversity over precisely the same surface area in the exact same manner. Thus, the use of ARMS is a systematic, consistent, and comparable method for monitoring the cryptobiota community overtime. At specific reef sites, divers enter the water and deploy and/or recover the ARMS unit. Each unit consists of 23 cm x 23 cm gray, type 1 PVC plates stacked in alternating series of 4 open and 4 obstructed layers and attached to a base plate of 35 cm x 45 cm which is affixed to the reef. They are designed to mimic the structural complexity of a reef and attract colonizing invertebrates. Upon recovery, the ARMS unit is encapsulated, brought to the surface, and disassembled and processed onboard the research ship. Disassembled plates are photographed to document recruited sessile organisms and scraped clean and preserved in 95% ethanol for future DNA processing. Recruited motile organisms are sieved into 3 size fractions: 2 mm, 500 um, and 100 um. The 500 um and 100 um fraction is bulked and preserved in 95% ethanol for future DNA processing. The 2 mm fraction is sorted into morphospecies.

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CoRIS_Metadata Pacific Reef Assessment and Monitoring Program (Pacific RAMP): Biennial monitoring for the U.S. Pacific Islands and Atolls 1221 587 National Coral Reef Monitoring Program 743 Numeric Data Sets > Biology EARTH SCIENCE > Oceans > Marine Biology > Marine Invertebrates EARTH SCIENCE > Oceans > Marine Biology > Cryptobiota EARTH SCIENCE > Oceans > Marine Biology > Brachyura EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Autonomous Reef Monitoring Structure (ARMS) EARTH SCIENCE > Oceans > Marine Biology > Marine Invertebrates > Macroinvertebrates EARTH SCIENCE > Oceans > Marine Biology > Marine Invertebrates > Census EARTH SCIENCE > Oceans > Marine Biology > Marine Invertebrates > Biodiversity EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > In Situ Biological Marine Ecosystem Reef Assessment and Monitoring Program (RAMP) National Coral Reef Monitoring Program Coral Reef Ecosystem Invertebrates Crytobiota National Coral Reef Monitoring Plan (NCRMP) Implementation Rapid Ecological Assessment (REA) Climate Station COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > American Samoa (14S170W0000) OCEAN BASIN > Pacific Ocean > American Samoa > American Samoa (14S170W0000) COUNTRY/TERRITORY > United States of America > American Samoa > Ofu Island > Ofu (14S169W0002) OCEAN BASIN > Pacific Ocean > Manu'a Group > Ofu (14S169W0002) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Ofu Island (14S169W0013) OCEAN BASIN > Pacific Ocean > Manu'a Group > Ofu Island (14S169W0013) COUNTRY/TERRITORY > United States of America > American Samoa > Olosega Island > Olosega (14S169W0016) OCEAN BASIN > Pacific Ocean > Manu'a Group > Olosega (14S169W0016) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Olosega Island (14S169W0014) OCEAN BASIN > Pacific Ocean > Manu'a Group > Olosega Island (14S169W0014) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Rose Atoll (14S168W0001) OCEAN BASIN > Pacific Ocean > American Samoa > Rose Atoll (14S168W0001) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Swains Atoll (11S171W0001) OCEAN BASIN > Pacific Ocean > American Samoa > Swains Atoll (11S171W0001) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Tutuila Island (14S170W0016) OCEAN BASIN > Pacific Ocean > American Samoa > Tutuila Island (14S170W0016) COUNTRY/TERRITORY > United States of America > Guam > Guam (13N144E0000) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Guam (13N144E0000) COUNTRY/TERRITORY > Northern Mariana Islands > Northern Mariana Islands > Northern Mariana Islands ( CNMI ) (18N146E0000) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Mariana Archipelago > Northern Mariana Islands ( CNMI ) (18N146E0000) COUNTRY/TERRITORY > Northern Mariana Islands > Maug > Maug Island (20N145E0001) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Maug Island > Maug Island (20N145E0001) COUNTRY/TERRITORY > Northern Mariana Islands > Pagan > Pagan Island (18N145E0001) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Pagan Island > Pagan Island (18N145E0001) COUNTRY/TERRITORY > Northern Mariana Islands > Rota > Rota Island ( Luta ) (14N145E0007) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Rota Island > Rota Island ( Luta ) (14N145E0007) COUNTRY/TERRITORY > Northern Mariana Islands > Saipan > Saipan Island (15N145E0002) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Saipan Island > Saipan Island (15N145E0002) COUNTRY/TERRITORY > United States of America > Hawaiian Islands (21N157W0027) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands (21N157W0027) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Hawaii > Hawaii (21N160W0000) COUNTRY/TERRITORY > United States of America > Hawaii > Hawaii > Hawaii (21N160W0000) COUNTRY/TERRITORY > United States of America > Hawaii > Hawaii > Hawaii Island (19N155W0003) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Hawaii Island > Hawaii Island (19N155W0003) COUNTRY/TERRITORY > United States of America > Hawaii > Hawaii > Kauai Island (22N159W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Kauai Island > Kauai Island (22N159W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Oahu (21N157W0003) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Oahu Island > Oahu (21N157W0003) COUNTRY/TERRITORY > United States of America > Hawaii > Maui > Maui Island (20N156W0004) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Maui Island > Maui Island (20N156W0004) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands (28N178W0000) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Northwestern Hawaiian Islands (28N178W0000) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > French Frigate Shoals (24N166W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > French Frigate Shoals (24N166W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Kure Atoll (28N178W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Kure Atoll (28N178W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Lisianski Island (25N173W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Lisianski Island (25N173W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Maro Reef (25N170W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Maro Reef (25N170W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Midway Atoll (28N177W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Midway Atoll (28N177W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Pearl and Hermes Reef (27N176W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Pearl and Hermes Reef (27N176W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Baker Island (00N176W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Baker Island > Baker Island (00N176W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Howland Island (00S176W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Howland Island > Howland Island (00S176W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Johnston Atoll (16N169W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Johnston Atoll > Johnston Atoll (16N169W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Jarvis Island (00S160W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Line Islands > Jarvis Island (00S160W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Kingman Reef (06N162W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Line Islands > Kingman Reef (06N162W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Palmyra Atoll (05N162W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Line Islands > Palmyra Atoll (05N162W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Wake Atoll (19N167E0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Wake Atoll > Wake Atoll (19N167E0001) Pacific Remote Island Areas Main Hawaiian Islands Commonwealth of the Northern Mariana Islands American Samoa Guam

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