National Coral Reef Monitoring Program: Calcification Rates of Crustose Coralline Algae Derived from Calcification Accretion Units (CAUs) Deployed across the Hawaiian Archipelago from 2010 to 2019

The calcification rate data described here are derived from Calcification Accretion Units (CAUs) that were deployed and retrieved at long-term climate monitoring sites during NOAA Pacific Islands Fisheries Science Center (PIFSC), Ecosystem Sciences Division (ESD) led National Coral Reef Monitoring Program (NCRMP) missions around the Hawaiian Archipelago in 2013, 2016, and 2019, as well as pre-NCRMP missions in 2010 and 2012. CAUs are PVC settlement plates that facilitate the recruitment and colonization of crustose coralline algae, hard corals, and other reef calcifiers. Laboratory experiments show that CCA and coral calcification rates are strongly correlated with seawater chemistry, and shifts in carbonate chemistry conditions due to ocean acidification could lead to reduced calcification and accretion rates and ecological phase shifts in coral reef communities.

Coral reef calcium carbonate accretion rates can be estimated by measuring the change in weight of the CAUs between deployment and retrieval. Monitoring net accretion over successive deployments allows for the detection of changes in reef calcification rates over time. Five units were deployed on the seafloor at each CAU site for 3 years. The number of processed CAUs for a site may be less than the number deployed, either because the units were lost or damaged at sea and therefore not recovered, or in rare instances, due to errors during laboratory processing.

This study provides information about spatial and temporal patterns of reef carbonate calcification and accretion rates and serves as a basis for detecting changes associated with changing seawater chemistry due to ocean acidification. These data can also be used in comparative analyses across natural gradients, thereby assisting efforts to determine whether key reef-building taxa can acclimatize to changing oceanographic environments. These data will have immediate, direct impacts on predictions of reef resilience in a higher carbon dioxide (CO2) world and on the design of reef management strategies.

Tags: 1221, 409, 587, 743, algae, algal cover, algal growth, aquatic habitat, biosphere, c204 pacific reef assessment and monitoring program (pacific ramp): biennial monitoring for the us p, calcareous macroalgae, calcification, calcification accretion unit, calcification accretion unit (cau), calcification plate, calcification rate, carbonate chemistry, central pacific ocean, coastal processes, coastal waters of hawaii, coral reef conservation program, 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, earth science, ecosystem sciences division, encrusting macroalgae, esd, fleshy macroalgae, french frigate shoals (24n166w0001), haramp, hawaii, hawaii island, hawaii island (19n155w0003), hawaiian archipelago, hawaiian archipelago reef assessment and monitoring program, hawaiian islands, hawaiian islands (21n157w0027), hi'ialakai, honolulu, in situ, kauai, kauai island, kauai island (22n159w0001), kure atoll (28n178w0001), laboratory analyses, lanai island, lanai island (20n156w0002), lisianski island (25n173w0001), main hawaiian islands, maui, maui island, maui island (20n156w0004), mhi, molokai island, molokai island (21n157w0001), national coral reef monitoring program, national marine fisheries service, ncrmp, niihau island, niihau island (21n160w0001), nmfs, noaa, north pacific ocean, northwestern hawaiian islands, northwestern hawaiian islands (28n178w0000), numeric data sets, nwhi, oahu (21n157w0003), oahu island, ocean acidification, ocean acidification - quantification of calcification and accretion rates of corals and crustose cor, ocean acidification program, ocean basin, ocean chemistry, oceans, office of oceanic and atmospheric research, oscar elton sette, pacific islands fisheries science center, pacific ocean, pacific reef and assessment monitoring program, pacific reef assessment and monitoring program: monitoring coral reef ecosystems of the us pacific i, papahanaumokuakea marine national monument, pearl and hermes reef (27n176w0001), pifsc, rainier, ramp, reef assessment and monitoring program, reef habitat, reef monitoring and assessment, settling plate, triennial, u.s. department of commerce, united states of america, us doc, vegetation, zoology
Organization: National Oceanic and Atmospheric Administration, Department of Commerce