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Like other reef-building corals, members of the genus Acropora form obligate endosymbioses with dinoflagellates (zooxanthellae) belonging to the genus Symbiodinium. Both Symbiodinium and its hosts are diverse assemblages, and the relationships between host and algal genotypes are unclear. In this study, we determined phylogenetic relationships between Symbiodinium isolates from a wide range of Acropora species and plotted the algal genotypes onto a molecular phylogeny of 28 Acropora species, using the same samples for the host and symbiont genotyping. In addition, we performed a preliminary survey of zooxanthella distribution in Acropora species from the central Great Barrier Reef. Three of the four known major zooxanthellae clades were represented in the 168 samples examined, and within the major clade C, three distinct subclades were identified. No evidence was found for coevolution, but several clear patterns of specificity were identified. Moreover, composition of the zooxanthella pool varied among locales and in one host species we found light-related patterns of zooxanthella distribution.

proceedings - royal society. biological sciences/proceedings - royal society. biological sciences

Patterns of coral–dinoflagellate associations in <i>Acropora</i> : significance of local availability and physiology of <i>Symbiodinium</i> strains and host–symbiont selectivity

Patterns of coral–dinoflagellate associations in Acropora : significance of local availability and physiology of Symbiodinium strains and host–symbiont selectivity