@ARTICLE{TreeBASE2Ref17362, author = {Scott R. Santos and Tonya L. Shearer and Andrew R. Hannes and Mary Alice Coffroth}, title = {Fine-scale specificity and diversity in the most prevalent lineage of symbiotic dinoflagellates (Symbiodinium, Dinophyceae) in the Caribbean.}, year = {2003}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Molecular Ecology}, volume = {}, number = {}, pages = {}, abstract = {The success of coral reefs is due to obligate mutualistic symbioses involving invertebrates and photosynthetic dinoflagellate symbionts belonging to the genus Symbiodinum. In the Caribbean, the vast majority of octocorals and other invertebrate hosts associate with Symbiodinium clade B, and more selectively, with a single lineage of this clade, Symbiodinium B1/B184. Although Symbiodinium B1/B184 represents the most prevalent Symbiodinium in the Caribbean, it is unknown whether it represents a single evolutionary lineage or is comprised of distinct sublineages. To explore this question, the flanking regions of two polymorphic microsatellites were sequenced from a series of Symbiodinium clade B cultures along with Symbiodinium B1/B184 populations of the octocorals Pseudopterogorgia elisabethae, P. bipinnata, and Gorgonia ventalina. Seven distinct sequence variants, referred to as phylotypes, were identified from these samples and their phylogenetic relationships inferred. Five of the phylotypes belonged to Symbiodinium B1/B184, providing the first evidence that the lineage is comprised of distinct sublineages. Furthermore, identification of specific Symbiodinium B1/B184 phylotypes associated with sympatric P. elisabethae and P. bipinnata at San Salvador, Bahamas, demonstrate unequivocally the existence of fine-scale specificity between Caribbean octocorals and these algae. Taken together, this study exemplifies the complex nature of Symbiodinium biodiversity and specificity.} }

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