Tracing a Protist Lineage's Endosymbiotic Origin and Ecological Role
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This capstone traces one photosynthetic dinoflagellate lineage from its secondary endosymbiotic chloroplast origin through its SAR supergroup placement to its ecological role as a coral symbiont.
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A dinoflagellate's ecological role as a coral symbiont depends on the two-step endosymbiotic history traced here— losing sight of either the primary or the secondary event obscures why this one photosynthetic lineage ended up living inside an animal's tissue at all.