An updated assessment of Symbiodinium spp. that associate with common scleractinian corals from Moorea (French Polynesia) reveals high diversity among background symbionts and a novel finding of clade B

PeerJ

article

Héloïse Rouzé¹  Gaël J. Lecellier¹  Denis Saulnier⁴  Serge Planes¹  Yannick Gueguen⁵  Herman H. Wirshing⁶  Véronique Berteaux-Lecellier¹ 

[1] PSL CRIOBE USR3278 CNRS-EPHE-UPVD, Labex CORAIL;Université de Paris Saclay;UMR250/9220 ENTROPIE IRD-CNRS-UR, Labex CORAIL;UMR241 EIO Ifremer-ILM-IRD-UPF, Labex CORAIL;UMR5244 IHPE, CNRS-Ifremer-UM-UPVD, Université de Montpellier;Department of Invertebrate Zoology, Smithsonian National Museum of Natural History

关键词: Corals;    French polynesia;    Clade B;    Symbiodinium;    qPCR;    Flexibility;    Generalist;    Faithful clade;   

DOI  :  10.7717/peerj.2856

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

The adaptative bleaching hypothesis (ABH) states that, depending on the symbiotic flexibility of coral hosts (i.e., the ability of corals to “switch” or “shuffle” their algal symbionts), coral bleaching can lead to a change in the composition of their associated Symbiodinium community and, thus, contribute to the coral’s overall survival. In order to determine the flexibility of corals, molecular tools are required to provide accurate species delineations and to detect low levels of coral-associated Symbiodinium. Here, we used highly sensitive quantitative (real-time) PCR (qPCR) technology to analyse five common coral species from Moorea (French Polynesia), previously screened using only traditional molecular methods, to assess the presence of low-abundance (background) Symbiodinium spp. Similar to other studies, each coral species exhibited a strong specificity to a particular clade, irrespective of the environment. In addition, however, each of the five species harboured at least one additional Symbiodinium clade, among clades A–D, at background levels. Unexpectedly, and for the first time in French Polynesia, clade B was detected as a coral symbiont. These results increase the number of known coral-Symbiodinium associations from corals found in French Polynesia, and likely indicate an underestimation of the ability of the corals in this region to associate with and/or “shuffle” different Symbiodinium clades. Altogether our data suggest that corals from French Polynesia may favor a trade-off between optimizing symbioses with a specific Symbiodinium clade(s), maintaining associations with particular background clades that may play a role in the ability of corals to respond to environmental change.

【 授权许可】

CC BY