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Symbiosis between coral reef fauna and microorganisms drives the growth, maintenanceand diversity of coral reef habitats. Sponges, a key faunal component of coral reefs, form complexsymbiotic relationships with microorganisms which may supply over half of their nutritionalrequirements through photosynthesis. The habitat distribution of the coral reef sponge Rhopaloeidesodorabile correlates with light availability, suggestive of photosynthesis. The present study directlyinvestigated the hypothesis that habitat distribution of R. odorabile is correlated with photosynthesis.Results of photorespirometry trials of 30 ind. exposed to light intensities between 0 and 900 μmol photonsm–2 s–1 showed no evidence of photosynthesis. Furthermore, no photopigments were present inthese sponges and no cyanobacteria could be detected within the tissue. These results did not varybetween sponges collected from nutrient rich inner- and mid-shelf reefs, or from oligotrophic outershelfreefs. These findings demonstrate that R. odorabile is not a phototrophic sponge and that habitatdistributions clearly correlated with light can be due to factors other than photosynthesis

Incongruence between the distribution of a common coral reef sponge and photosynthesis