NDLI: Variation in oxygen isotope ratio of dissolved orthophosphate induced by uptake process in natural coral holobionts

Content Provider	Springer Nature Link
Author	Ferrera, Charissa M. Miyajima, Toshihiro Watanabe, Atsushi Umezawa, Yu Morimoto, Naoko San Diego McGlone, Maria Lourdes Nadaoka, Kazuo
Copyright Year	2015
Abstract	A model incubation experiment using natural zooxanthellate corals was conducted to evaluate the influence of phosphate uptake by coral holobionts on oxygen isotope ratio of dissolved PO4 3− (δ18Op). Live coral samples of Acropora digitifera, Porites cylindrica, and Heliopora coerulea were collected from coral reefs around Ishigaki Island (Okinawa, Japan) and Bolinao (northern Luzon, Philippines) and incubated for 3–5 d after acclimatization under natural light conditions with elevated concentrations of PO4 3–. Phosphate uptake by corals behaved linearly with incubation time, with uptake rate depending on temperature. δ18Op usually increased with time toward the equilibrium value with respect to oxygen isotope exchange with ambient seawater, but sometimes became higher than equilibrium value at the end of incubation. The magnitude of the isotope effect associated with uptake depended on coral species; the greatest effect was in A. digitifera and the smallest in H. coerulea. However, it varied even within samples of a single coral species, which suggests multiple uptake processes with different isotope effects operating simultaneously with varying relative contributions in the coral holobionts used. In natural environments where concentrations of PO4 3– are much lower than those used during incubation, PO4 3– is presumably turned over much faster and the δ18Op easily altered by corals and other major primary producers. This should be taken into consideration when using δ18Op as an indicator of external PO4 3– sources in coastal ecosystems.
Starting Page	655
Ending Page	668
Page Count	14
File Format	PDF
ISSN	07224028
Journal	Coral Reefs
Volume Number	35
Issue Number	2
e-ISSN	14320975
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-11-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Corals Nutrient uptake Phosphate Oxygen isotopes Fractionation Freshwater & Marine Ecology Oceanography
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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