Abstract:
:Reef-building corals form their calcium carbonate skeletons within an extracellular calcifying medium (ECM). Despite the critical role of the ECM in coral calcification, ECM carbonate chemistry is poorly constrained in vivo, and full ECM carbonate chemistry has never been characterized based solely on direct in vivo measurements. Here, we measure pHECM in the growing edge of Stylophora pistillata by simultaneously using microsensors and the fluorescent dye SNARF-1, showing that, when measured at the same time and place, the results agree. We then conduct microscope-guided microsensor measurements of pH, [Ca2+], and [CO32-] in the ECM and, from this, determine [DIC]ECM and aragonite saturation state (Ωarag), showing that all parameters are elevated with respect to the surrounding seawater. Our study provides the most complete in vivo characterization of ECM carbonate chemistry parameters in a coral species to date, pointing to the key role of calcium- and carbon-concentrating mechanisms in coral calcification.
journal_name
Sci Advjournal_title
Science advancesauthors
Sevilgen DS,Venn AA,Hu MY,Tambutté E,de Beer D,Planas-Bielsa V,Tambutté Sdoi
10.1126/sciadv.aau7447subject
Has Abstractpub_date
2019-01-16 00:00:00pages
eaau7447issue
1issn
2375-2548pii
aau7447journal_volume
5pub_type
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