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Preprints
https://doi.org/10.5194/egusphere-2022-240
https://doi.org/10.5194/egusphere-2022-240
16 Jun 2022
 | 16 Jun 2022

Early life stages of a Mediterranean coral are vulnerable to ocean warming and acidification

Chloe Carbonne, Steeve Comeau, Phoebe T. W. Chan, Keyla Plichon, Jean-Pierre Gattuso, and Núria Teixidó

Abstract. The ability of coral populations to recover from disturbance depends on larval dispersion and recruitment. While ocean warming and acidification effects on adult corals are well documented, information on early life stages is comparatively scarce. Here, we investigate whether ocean warming and acidification can affect the larval and juvenile development of the Mediterranean azooxanthellate coral Astroides calycularis. Larvae and juveniles were raised for 9 months at ambient (23 °C) and warm (26 °C) temperatures and ambient (8.0) and low pH (7.7, on the total scale). The timing of the larvae metamorphosis, growth of the juvenile polyp, and skeletal characteristics of the 9-month-old polyps were monitored. Settlement and metamorphosis were more successful and hastened under a warm temperature. In contrast, low pH delayed the metamorphosis and affected growth of the recruits by reducing the calcified area of attachment to the substrate, as well as by diminishing the skeleton volume and the number of septa. However, skeleton density was higher under low pH and ambient temperature. The warm temperature and low pH treatment had a negative impact on the survival, settlement, and growth of recruits. This study provides evidence of the threat that represents ocean warming and acidification for the larval recruitment and the growth of recruits of A. calycularis.

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Journal article(s) based on this preprint

12 Oct 2022
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Early life stages of a Mediterranean coral are vulnerable to ocean warming and acidification
Chloe Carbonne, Steeve Comeau, Phoebe T. W. Chan, Keyla Plichon, Jean-Pierre Gattuso, and Núria Teixidó
Biogeosciences, 19, 4767–4777, https://doi.org/10.5194/bg-19-4767-2022,https://doi.org/10.5194/bg-19-4767-2022, 2022
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Carbonne et al. identified the concurrent impact of Ocean Acidification as well as ocean warming...
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For the first time, our study highlights the synergistic and additive effects a 9-month warming...
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