Ciliary vortex flows and oxygen dynamics in the coral boundary layer


Contact
Claudio.Richter [ at ] awi.de

Abstract

The exchange of metabolites between environment and coral tissue depends on the flux across the diffusive boundary layer (DBL) surrounding the tissue. Cilia covering the coral tissue have been shown to create vortices that enhance mixing in the DBL in stagnant water. To study the role of cilia under simulated ambient currents, we designed a new light-sheet microscopy based flow chamber setup. Microparticle velocimetry was combined with high-resolution oxygen profiling in the coral Porites lutea under varying current and light conditions with natural and arrested cilia beating. Cilia-generated vortices in the lower DBL mitigated extreme oxygen concentrations close to the tissue surface. Under light and arrested cilia, oxygen surplus at the tissue surface increased to 350 µM above ambient, in contrast to 25 µM under ciliary beating. Oxygen shortage in darkness decreased from 120 µM (cilia arrested) to 86 µM (cilia active) below ambient. Ciliary redistribution of oxygen had no effect on the photosynthetic efficiency of the photosymbionts and overall oxygen flux across the DBL indicating that oxygen production and consumption was not affected. We found that corals actively change their environment and suggest that ciliary flows serve predominantly as a homeostatic control mechanism which may play a crucial role in coral stress response and resilience.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
52268
DOI 10.1038/s41598-020-64420-7

Cite as
Pacherres Reaño, C. O. , Ahmerkamp, S. , Schmidt-Grieb, G. , Holtappels, M. and Richter, C. (2020): Ciliary vortex flows and oxygen dynamics in the coral boundary layer , Scientific Reports, 10 (7541) . doi: 10.1038/s41598-020-64420-7


Download
[img]
Preview
PDF
Pacherres2020.pdf

Download (3MB) | Preview

Share


Citation

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item