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 Teixidó1,4Chloe Carbonne et al.Chloe Carbonne1,Steeve Comeau1,Phoebe T. W. Chan1,Keyla Plichon1,2,Jean-Pierre Gattuso1,3,and Núria Teixidó1,4
Received: 20 Apr 2022 – Discussion started: 16 Jun 2022
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.
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.
For the first time, our study highlights the synergistic and additive effects a 9-month warming...