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Coral larvae avoid substratum exploration and settlement in low-oxygen environments

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Abstract

Oxygen is a critical resource that mediates a multitude of essential processes and interactions at multiple scales on coral reefs. In adult corals, it can directly or indirectly impact physiological processes, such as photosynthesis, respiration, and calcification. Moreover, many corals bleach as a consequence of being exposed to low oxygen. The sessile adult phase of corals makes habitat selection crucial for post-settlement survival and thus their pelagic larvae use a diverse array of cues to determine a suitable spot for settlement. However, the effects of oxygen on the early life stages of corals are still poorly known. This study investigated the importance of oxygen as a potential settlement cue and its effect on swimming and settlement behavior of coral larvae of two Acropora species. Two experiments were performed, one investigating coral larval swimming behavior under different oxygen conditions and the other studying coral larval settlement along an oxygen gradient. Bottom exploration, expressed as the percent of A. cytherea and A. pulchra larvae in the bottom section of experimental cylinders, was reduced by 96% and 100%, respectively, in hypoxic water compared to normoxic water. When offered the choice to settle on an otherwise preferred settlement substrate (Titanoderma prototypum) along an oxygen gradient, larvae of both coral species settled almost exclusively on T. prototypum fragments placed in well-oxygenated environments, with settlement rates increasing nonlinearly with oxygen concentrations. These results suggest that low-oxygen areas can negatively influence the settlement success of coral larvae and that oxygen concentration may be used as a cue for coral larval swimming and settlement behavior.

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Acknowledgements

We thank the staff of the CRIOBE research station for logistical support, and Anaïs Martin and Rachael Lamore for help with the collections of gametes during the coral spawning and for help in the lab. HJ was supported by a PhD Grant (CORALINE) from the Laboratoire d’Excellence CORAIL. Additional support was provided by PEPS Exomod CNRS (ALGECO) and ANR (No. ANR-18-CE02-0009-01) to MMN. All research was performed under annual research permits (unnumbered) issued by the French Polynesian Ministry of Research to the CRIOBE.

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  1. EPHE, USR3278 CRIOBE, UPVD-CNRS, PSL Research University, 66860, Perpignan, France

    Hendrikje Jorissen & Maggy M. Nugues

  2. Labex Corail, CRIOBE, 98729, Moorea, French Polynesia

    Maggy M. Nugues

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  1. Hendrikje Jorissen
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Jorissen, H., Nugues, M.M. Coral larvae avoid substratum exploration and settlement in low-oxygen environments. Coral Reefs 40, 31–39 (2021). https://doi.org/10.1007/s00338-020-02013-6

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