Research Article| April 01, 2015 RESPONSE OF THE MILIOLID ARCHAIAS ANGULATUS TO SIMULATED OCEAN ACIDIFICATION Paul O. Knorr; Paul O. Knorr 5 1U.S. Geological Survey, 600 4th Street South, St. Petersburg, FL 33701, U.S.A.2Now at: Bureau of Ocean Energy Management, Department of the Interior, 381 Elden Street, HM3120, Herndon, VA 20170, U.S.A. 5Correspondence author. E-mail: paul.knorr@boem.gov Search for other works by this author on: GSW Google Scholar Lisa L. Robbins; Lisa L. Robbins 1U.S. Geological Survey, 600 4th Street South, St. Petersburg, FL 33701, U.S.A. Search for other works by this author on: GSW Google Scholar Peter J. Harries; Peter J. Harries 3School of Geosciences, University of South Florida, 4202 E. Fowler Ave., NES 107, Tampa, FL 33620-5201, U.S.A. Search for other works by this author on: GSW Google Scholar Pamela Hallock; Pamela Hallock 4College of Marine Science, University of South Florida, 140 7th Avenue South, St. Petersburg, FL 33701, U.S.A. Search for other works by this author on: GSW Google Scholar Jonathan Wynn Jonathan Wynn 3School of Geosciences, University of South Florida, 4202 E. Fowler Ave., NES 107, Tampa, FL 33620-5201, U.S.A. Search for other works by this author on: GSW Google Scholar Author and Article Information Paul O. Knorr 5 1U.S. Geological Survey, 600 4th Street South, St. Petersburg, FL 33701, U.S.A.2Now at: Bureau of Ocean Energy Management, Department of the Interior, 381 Elden Street, HM3120, Herndon, VA 20170, U.S.A. Lisa L. Robbins 1U.S. Geological Survey, 600 4th Street South, St. Petersburg, FL 33701, U.S.A. Peter J. Harries 3School of Geosciences, University of South Florida, 4202 E. Fowler Ave., NES 107, Tampa, FL 33620-5201, U.S.A. Pamela Hallock 4College of Marine Science, University of South Florida, 140 7th Avenue South, St. Petersburg, FL 33701, U.S.A. Jonathan Wynn 3School of Geosciences, University of South Florida, 4202 E. Fowler Ave., NES 107, Tampa, FL 33620-5201, U.S.A. 5Correspondence author. E-mail: paul.knorr@boem.gov Publisher: Cushman Foundation for Foraminiferal Research Received: 26 Nov 2013 Accepted: 18 Sep 2014 First Online: 13 Jul 2017 Online ISSN: 1943-264X Print ISSN: 0096-1191 © 2015 Cushman Foundation for Foraminiferal Research Journal of Foraminiferal Research (2015) 45 (2): 109–127. https://doi.org/10.2113/gsjfr.45.2.109 Article history Received: 26 Nov 2013 Accepted: 18 Sep 2014 First Online: 13 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Paul O. Knorr, Lisa L. Robbins, Peter J. Harries, Pamela Hallock, Jonathan Wynn; RESPONSE OF THE MILIOLID ARCHAIAS ANGULATUS TO SIMULATED OCEAN ACIDIFICATION. Journal of Foraminiferal Research 2015;; 45 (2): 109–127. doi: https://doi.org/10.2113/gsjfr.45.2.109 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Foraminiferal Research Search Advanced Search Abstract A common, but not universal, effect of ocean acidification on benthic foraminifera is a reduction in the growth rate. The miliolid Archaias angulatus is a high-Mg (>4 mole% MgCO3), symbiont-bearing, soritid benthic foraminifer that contributes to Caribbean reef carbonate sediments. A laboratory culture study assessed the effects of reduced pH on the growth of A. angulatus. We observed a statistically significant 50% reduction in the growth rate (p < 0.01), calculated from changes in maximum diameter, from 160 μm/28 days in the pH 8.0/pCO2air 480 ppm control group to 80 μm/28 days at a treatment level of pH 7.6/pCO2air 1328 ppm. Additionally, pseudopore area, δ18O values, and Mg/Ca ratio all increased, albeit slightly in the latter two variables. The reduction in growth rate indicates that under a high-CO2 setting, future A. angulatus populations will consist of smaller adults. A model using the results of this study estimates that at pH 7.6 A. angulatus carbonate production in the South Florida reef tract and Florida Bay decreases by 85%, from 0.27 Mt/yr to 0.04 Mt/yr, over an area of 9,000 km2. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.