16 Jun 2022
16 Jun 2022
Status: this preprint is open for discussion.

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

Chloe Carbonne1, Steeve Comeau1, Phoebe T. W. Chan1, Keyla Plichon1,2, Jean-Pierre Gattuso1,3, and Núria Teixidó1,4 Chloe Carbonne et al.
  • 1Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, 181 chemin du Lazaret, 06230 Villefranche-sur-mer, France
  • 2MSc MARRES, Université Côte d’Azur, Sophia Antipolis Campus, 06103 Nice, France
  • 3Institute for Sustainable Development and International Relations, Sciences Po, 27 rue Saint Guillaume, F-75007 Paris, France
  • 4Stazione Zoologica Anton Dohrn, Ischia Marine Centre, Department of Integrated Marine Ecology, Punta San Pietro, 80077, Ischia (Naples), Italy

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.

Chloe Carbonne et al.

Status: open (until 28 Jul 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Chloe Carbonne et al.


Total article views: 217 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
154 56 7 217 13 2 4
  • HTML: 154
  • PDF: 56
  • XML: 7
  • Total: 217
  • Supplement: 13
  • BibTeX: 2
  • EndNote: 4
Views and downloads (calculated since 16 Jun 2022)
Cumulative views and downloads (calculated since 16 Jun 2022)

Viewed (geographical distribution)

Total article views: 144 (including HTML, PDF, and XML) Thereof 144 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
Latest update: 02 Jul 2022
Short summary
For the first time, our study highlights the synergistic and additive effects a 9-month warming and acidification combined stress on the early life stages of a Mediterranean azooxanthellate coral, Astroides calycularis. Our results predict a decrease of dispersion, settlement, post-settlement growth and survival under future global change and that larvae and recruits of A. calycularis are stages of interest for this Mediterranean coral resistance, resilience and conservation.