Calcification Rates of Crustose Coralline Algae (CCA) Derived from Calcification Accretion Units (CAUs) Deployed at Coral Reef Sites in Timor-Leste from 2012 to 2014

The calcification rate data described here are derived from calcification accretion units (CAUs) that were retrieved from fixed climate survey sites located in coral reef habitats during the NOAA Pacific Islands Fisheries Science Center (PIFSC), Ecosystem Sciences Division (ESD) led United States Agency for International Development (USAID) mission to Timor-Leste in 2014. 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 changes 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 2 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: 483, algae, algal cover, algal growth, aquatic habitat, atauro, baseline studies, baucau, biodiversity and fisheries in the coral triangle: embracing the e in ecosystem approaches to fisheri, biosphere, bobonaro, calcareous macroalgae, calcification, calcification accretion unit, calcification accretion unit (cau), calcification plate, calcification rate, carbonate chemistry, cau, climate, coastal processes, coral reef conservation program, coral reef ecosystem division, coral reef ecosystem program, coral reef studies, coral reefs, coral triangle initiative, corals, country/territory, cred, crep, crustose coralline algae, democratic republic of timor-leste (east timor) (09s126e0001), dili, doc/noaa/nmfs/pifsc, earth science, ecosystem sciences division, encrusting macroalgae, esd, fleshy macroalgae, in situ, in situ biological, indian ocean, laboratory analyses, lautem, manatuto, national marine fisheries service, nmfs, noaa, numeric data sets, ocean acidification, ocean basin, ocean chemistry, oceans, pacific islands fisheries science center, pifsc, reef habitat, reef monitoring and assessment, settling plate, timor leste, timor sea, timor-leste, triennial, u.s. department of commerce, united states agency for international development, us doc, usaid, vegetation, vila mpa, zoology
Organization: National Oceanic and Atmospheric Administration, Department of Commerce