Response of the Miliolid Archaias angulatus to simulated ocean acidification
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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.
| 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 |
| Google Analytic Metrics | Metrics page |