Ousley, Sara, de Beer, Dirk, Bejarano, Sonia ORCID: https://orcid.org/0000-0001-6451-6354 and Chennu, Arjun ORCID: https://orcid.org/0000-0002-0389-5589 (2022) High-Resolution Dynamics of Hydrogen Peroxide on the Surface of Scleractinian Corals in Relation to Photosynthesis and Feeding. Frontiers in Marine Science, 9 . DOI https://doi.org/10.3389/fmars.2022.812839.

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Abstract

We developed and used a microsensor to measure fast (<1 s) dynamics of hydrogen peroxide (H2O2) on the polyp tissue of two scleractinian coral species (Stylophora pistillata and Pocillopora damicornis) under manipulations of illumination, photosynthesis, and feeding activity. Our real-time tracking of H2O2 concentrations on the coral tissue revealed rapid changes with peaks of up to 60 μM. We observed bursts of H2O2 release, lasting seconds to minutes, with rapid increase and decrease of surficial H2O2 levels at rates up to 15 μM s–1. We found that the H2O2 levels on the polyp surface are enhanced by oxygenic photosynthesis and feeding, whereas H2O2 bursts occurred randomly, independently from photosynthesis. Feeding resulted in a threefold increase of baseline H2O2 levels and was accompanied by H2O2 bursts, suggesting that the coral host is the source of the bursts. Our study reveals that H2O2 levels at the surface of coral polyps are much higher and more dynamic than previously reported, and that bursts are a regular feature of the H2O2 dynamics in the coral holobiont.

Document Type:	Article
Programme Area:	PA1, PA2
Research affiliation:	Ecology > Reef Systems Integrated Modelling > Data Science and Technology
Refereed:	Yes
Open Access Journal?:	Yes
DOI:	https://doi.org/10.3389/fmars.2022.812839
ISSN:	2296-7745
Date Deposited:	02 Feb 2022 08:59
Last Modified:	26 Mar 2024 13:31
URI:	http://cris.leibniz-zmt.de/id/eprint/4850

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