Morpho-functional traits of the coral Stylophora pistillata enhance light capture for photosynthesis at mesophotic depths

Netanel Kramer*, Jiaao Guan, Shaochen Chen, Daniel Wangpraseurt, Yossi Loya

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The morphological architecture of photosynthetic corals modulates the light capture and functioning of the coral-algal symbiosis on shallow-water corals. Since corals can thrive on mesophotic reefs under extreme light-limited conditions, we hypothesized that microskeletal coral features enhance light capture under low-light environments. Utilizing micro-computed tomography scanning, we conducted a novel comprehensive three-dimensional (3D) assessment of the small-scale skeleton morphology of the depth-generalist coral Stylophora pistillata collected from shallow (4–5 m) and mesophotic (45–50 m) depths. We detected a high phenotypic diversity between depths, resulting in two distinct morphotypes, with calyx diameter, theca height, and corallite marginal spacing contributing to most of the variation between depths. To determine whether such depth-specific morphotypes affect coral light capture and photosynthesis on the corallite scale, we developed 3D simulations of light propagation and photosynthesis. We found that microstructural features of corallites from mesophotic corals provide a greater ability to use solar energy under light-limited conditions; while corals associated with shallow morphotypes avoided excess light through self-shading skeletal architectures. The results from our study suggest that skeleton morphology plays a key role in coral photoadaptation to light-limited environments.

Original languageEnglish
Article number861
JournalCommunications Biology
Volume5
Issue number1
DOIs
StatePublished - Dec 2022

Funding

FundersFunder number
ISF-NRF
IUI
Interuniversity Institute for Marine Sciences in Eilat
PADI Foundation74641
National Research Foundation Singapore
Israel Science Foundation

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