| speciation and biosynthetic variation in four dictyoceratid sponges and their cyanobacterial symbiont, oscillatoria spongeliae. | four species of marine sponges (phylum porifera, order dictyoceratida), which contain the filamentous cyanobacterial symbiont oscillatoria spongeliae, were collected from four locations in palau. the halogenated natural products associated with the symbiont were characterized from each sample, revealing that each species contained either chlorinated peptides, brominated diphenyl ethers, or no halogenated compounds. analysis of the host sponges and the symbionts indicated that each species of spo ... | 2005 | 15797223 |