Response of the Miliolid Archaias angulatus to simulated ocean acidification

Journal of Foraminiferal Research
By: , and 

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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.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Response of the Miliolid Archaias angulatus to simulated ocean acidification
Series title Journal of Foraminiferal Research
DOI 10.2113/gsjfr.45.2.109
Volume 45
Issue 2
Year Published 2015
Language English
Publisher Cushman Foundation for Foraminiferal Research
Publisher location Washington, D.C.
Contributing office(s) St. Petersburg Coastal and Marine Science Center
Description 19 p.
First page 109
Last page 127
Online Only (Y/N) N
Additional Online Files (Y/N) N