, Volume 163, Issue 3-4, pp 153-163

DNA divergency and speciation inSymbiodinium (Dinophyceae)

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Relationship among symbiotic dinoflagellates of the genusSymbiodinium derived from seven different host species has been studied by means of DNA/DNA hybridization. DNA homologies range from about 70 to 30%D. Highest homology is regarded as subspecific level. Based on the characteristics of DNA and phenotypes,Symbiodinium microadriaticum subsp.microadriaticum is separated fromSymbiodinium microadriaticum subsp.condylactis. Lowest homology occurs at the methodical background, and is similar to that obtained with DNA of algae belonging to different classes. The data are in excellent agreement with DNA base composition, karyotypes, and morpohological as well as biochemical markers, emphasizing speciation among these gymnodinioid zooxanthellae.

Dedicated to DrRobert K. Trench, Professor of Biology and Geology, University of California at Santa Barbara, whose work initiated recognition of speciation in zooxanthellae.