Abstract
Although the hydrocoral Millepora alcicornis is a prominent and ecologically relevant amphi-Atlantic reef builder, little attention has been given to its endosymbionts which are also involved in the survival and adaptation success of the species in different environments. In this study, we resolve the genetic relationships between M. alcicornis and its symbionts (Symbiodiniaceae) within both sides and across the Atlantic. The COI and 16S-rDNA regions were selected for the host tissues, and the 23S-rDNA and ITS regions were chosen for the symbionts. Phylogenetic networks consistently showed that host populations from the eastern Atlantic archipelagos (Canary and Cape Verde Islands) were more related to western Atlantic populations than they were between them. However, results for Symbiodiniaceae species varied according to the molecular marker used. Samples from Mexico were grouped as Symbiodinium sp. (formerly Symbiodinium clade A) by both markers. Specimens from Puerto Rico were grouped as either Symbiodinium sp. or Breviolum sp. (formerly Symbiodinium clade B), according to the molecular marker used. Most samples from the eastern Atlantic were identified as Breviolum sp. by both markers, except for one sample from the Canary Islands and two samples from the Cape Verde Islands, which were identified as Cladocopium sp. (formerly Symbiodinium clade C) using ITS-rDNA. These results suggest that these two genera of Symbiodiniaceae may cohabit the same M. alcicornis colony. Because hydrocorals from the Canary Islands were phylogenetically related to the western Atlantic, but symbionts were more related to those of the Cape Verde Islands, the origin of the coral and its symbionts is probably different. This may be explained either by “horizontal” transmission, i.e. acquisition from the environment, or by a change in the dominant symbiont composition within the host. The flexibility of this hydrocoral to select symbionts, depending on environmental conditions, can provide new insight to understand how this coral may face ongoing climate change.
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Acknowledgments
L. Rodríguez was supported by a FPU fellowship (Formación del Profesorado Universitario) from the Spanish Ministry of Education, Culture and Sports (Ref AP2012-3702). The Agencia Canaria de Investigación, Innovación y Sociedad de la Información de la Consejería de Economía, Industria, Comercio y Conocimiento (ACIISI) and Fondo Social Europeo (FSE) Programa Operativo Integrado de Canarias 2014–2020, Eje 3 Tema Prioritario 74 (85%) supported C. López. The research was also supported by the Systematics Research Fund (SRF) award from the Linnean Society and the Systematics Association. In México, the research was supported by UNAM-ICML Project Number 608. We want to thank the laboratory assistance from Anais Redruello, Sandra Sacristan and Lidia Plaza (URJC), and we thank Dr. Luis Parmenio Suescún and Dr. Patricia Thomé for sharing laboratory equipment and scientific advice during the work developed in Mexico (UNAM). We thank Ingrid C. Ortiz González, Dr. Nikolaos V. Schizas and the Department of Marine Sciences at the University of Puerto Rico, and Mayagüez for their support and laboratory assistance in Puerto Rico.
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Rodríguez, L., López, C., Casado-Amezua, P. et al. Genetic relationships of the hydrocoral Millepora alcicornis and its symbionts within and between locations across the Atlantic. Coral Reefs 38, 255–268 (2019). https://doi.org/10.1007/s00338-019-01772-1
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DOI: https://doi.org/10.1007/s00338-019-01772-1