[Coral-List] New Article in Coral Reefs

[Gonzalo Pérez-Rosales Blanch]

Dear Coral-List, 

We would like to share our new paper published yesterday in the Coral Reefs journal.

Title: Differential strategies developed by two light-dependent scleractinian corals to extend their vertical range to mesophotic depths  

Abstract: Mesophotic coral ecosystems are characterised by the presence of photosynthetic scleractinian corals despite the decreasing amounts of light available with depth. To better understand physiological strategies across a broad depth gradient, we studied the biological trait responses of Pocillopora cf. verrucosa from 6 to 60 m depth and Pachyseris “speciosa” spp. from 20 to 90 m depth at four islands of French Polynesia. Specifically, we characterised associated Symbiodiniaceae communities, photophysiological traits (Symbiodiniaceae density and chlorophyll concentrations), micro-morphology and trophic plasticity (autotrophy vs heterotrophy inferred from stable isotopes). Our results showed that both taxa can live at mesophotic depths without significant genetic structuring in their generic Symbiodiniaceae communities, mainly composed of Cladocopium and Durusdinium. Yet, the prevalence of Symbiodiniaceae ITS2 profiles revealed location-based variations that sometimes interact with depth and highlight putative shallow- or depth-tolerant taxa. For both taxa, symbiont density and chlorophyll pigment concentrations increased with increasing depth. We also found a change in their skeletal micro-morphology with an increase in the inter-corallite distance for Pocillopora cf. verrucosa and a decrease in the height of septa for Pachyseris “speciosa” spp. with depth. Finally, we found no isotopic evidence of switching to a more heterotrophic diet as their primary energy source, although host–tissue δ13C ratios became more negative with depth in both corals. Overall, our findings show similarity (across the two species) and species-specific strategies (biological trait patterns with increasing depth) underlying the capacity of symbiotic scleractinian corals to live in low-light environments.

Link to Coral Reefs article: https://doi.org/10.1007/s00338-024-02544-2 (It is open-access)

Link to data and codes: https://github.com/gonzaloprb/Coral_Physiology_Depth_CoralReefs 

Thanks, 
Gonzalo Pérez-Rosales

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Gonzalo PÉREZ-ROSALES, PhD
Post-Doctoral Fellow - HKUST - Wyatt Lab
Hong Kong University of Science and Technology
gonzalo.prb at gmail.com <mailto:gonzalo.prb at gmail.com>
gonzalo at ust.hk <mailto:gperez-rosales at ust.hk>
Twitter: @Perez_Rosales_G
Ocean Ecol (Wyatt) Lab: https://www.oceanecol.com/ 
Personal Website: https://gonzaloperezrosales.netlify.app/