NDLI: Coral calcification under environmental change: a direct comparison of the alkalinity anomaly and buoyant weight techniques

Content Provider	Springer Nature Link
Author	Schoepf, Verena Hu, Xinping Holcomb, Michael Cai, Wei Jun Li, Qian Wang, Yongchen Xu, Hui Warner, Mark E. Melman, Todd F. Hoadley, Kenneth D. Pettay, D. Tye Matsui, Yohei Baumann, Justin H. Grottoli, Andréa G.
Copyright Year	2016
Abstract	Two primary methods—the buoyant weight (BW) and alkalinity anomaly (AA) techniques—are currently used to quantify net calcification rates (G) in scleractinian corals. However, it remains unclear whether they are directly comparable since the few method comparisons conducted to date have produced inconsistent results. Further, such a comparison has not been made for tropical corals. We directly compared G BW and G AA in four tropical and one temperate coral species cultured under various pCO2, temperature, and nutrient conditions. A range of protocols for conducting alkalinity depletion incubations was assessed. For the tropical corals, open-top incubations with manual stirring produced G AA that were highly correlated with and not significantly different from G BW. Similarly, G AA of the temperate coral was not significantly different from G BW when incubations provided water motion using a pump, but were significantly lower than G BW by 16% when water motion was primarily created by aeration. This shows that the two techniques can produce comparable calcification rates in corals but only when alkalinity depletion incubations are conducted under specific conditions. General recommendations for incubation protocols are made, especially regarding adequate water motion and incubation times. Further, the re-analysis of published data highlights the importance of using appropriate regression statistics when both variables are random and measured with error. Overall, we recommend the AA technique for investigations of community and short-term day versus night calcification, and the BW technique to measure organism calcification rates integrated over longer timescales due to practical limitations of both methods. Our findings will facilitate the direct comparison of studies measuring coral calcification using either method and thus have important implications for the fields of ocean acidification research and coral biology in general.
Starting Page	13
Ending Page	25
Page Count	13
File Format	PDF
ISSN	07224028
Journal	Coral Reefs
Volume Number	36
Issue Number	1
e-ISSN	14320975
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-10-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Calcification Buoyant weight Alkalinity anomaly Method comparison Ocean acidification Incubation Freshwater & Marine Ecology Oceanography
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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