Abstract
Clipperton, an uninhabited and remote coral atoll from the Eastern Pacific, is an important steppingstone area that harbors a high marine biodiversity. Despite its biogeographic importance, little information on the ecological status of its coral reefs is available from the last decade. Herein, we characterized the benthic coral community and health status among four different shallow reef-zones (North to South) of Clipperton during the Tara Pacific expedition in 2018. The benthic composition (expressed as coverage percentage), as well as occurrence of potential disease-like phenotypes, in particular a pink-spotted coral phenotype was assessed. Average live coral cover on Clipperton reefs was 66% (range 55–85%), differing between sites, with massive Porites and branching Pocillopora corals dominating the benthic community with an average 48% (32–66%), and 15% (3–21%), respectively. While Clipperton reefs exhibited significant live coral cover overall, and no other disease-like phenotypic were observed, the pink-spotted coral phenotype was common, with a higher occurrence in massive corals (Porites 27%, and Pavona 31%). This observation may be related to the combined effects of previously heatwaves, and local inputs of guano-derived nutrients discharged during storms and hurricanes, which may suggest that even highly remote reefs supporting high coral cover can be subject to local and global threats. An alternative hypothesis is that the observation of a healthy reef with high coral cover and high incidence of pink-spotted coral phenotype in the absence of other diseases might reflect potential infection with the parasitic trematode Podocotyloides stenometra. While this hypothesis will have to be confirmed by histological and molecular analysis, it may be possible that larvae of this trematode may experience favorable conditions due to periodic nutrient input frorm the nutrient-rich lagoon or via guano run-off of Clipperton Island.
Data availability
All data generated or analyzed during this study are included in this published article.
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Acknowledgements
The authors are grateful to the commitment of the people and the following institutions and sponsors who made the Tara Pacific expedition possible: CNRS, CSM, PSL, KAUST, Genoscope/CEA, ANR-CORALGENE, France Genomique, agnès b., the Veolia Environment Foundation, Region Bretagne, Serge Ferrari, Billerudkorsnas, AmerisourceBergen Company, Lorient Agglomération, Oceans by Disney, the Prince Albert II de Monaco Foundation, L’Oreal, Biotherm, France Collectivites, Kankyo Station, Fonds Français pour l’Environnement Mondial (FFEM), Etienne Bourgois, UNESCO-IOC, the Tara Foundation teams and crew. The authors thank the Haut Commissariat de la République en Polynésie française for permission to perform this research at Clipperton Atoll. We would particularly like to thank A. Pey, J. Lancelot and M. Hertau for diving assistance during benthic surveys and C. Wilkinson for language editing services. We thank the editor and an anonymous reviewer for their constructive comments, which greatly improved the manuscript.
Funding
This project has been supported in part through the Tara Pacific Expedition, France Genomique grant number ANR-10-INBS-09, and the Genoscope/CEA. The present work was also supported by Consejo Nacional de Ciencia y Tecnología (CONACYT) postdoctoral fellowship (CVU 410380) to JJATL.
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EEGC conceived the study, performed supervision and funding acquisition. CP collected data. JJATL analyzed data. CP and JJATL wrote original draft. All authors reviewed, edited, approved and revised the final version of this manuscript.
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Pogoreutz, C., Clua, E.E.G. & Tortolero-Langarica, J.J.A. High live coral cover and incidence of a pink-spotted coral phenotype on remote reefs off Clipperton Island, Tropical Eastern Pacific. Mar Biol 169, 115 (2022). https://doi.org/10.1007/s00227-022-04101-3
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DOI: https://doi.org/10.1007/s00227-022-04101-3