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Net primary productivity in coral reef sponges
Science (New York, N.Y.)
|January 28, 1983
Summary
Most common sponges in the Great Barrier Reef harbor symbiotic cyanobacteria. Six species are net primary producers, generating more oxygen via photosynthesis than they consume through respiration.
Area of Science:
- Marine biology
- Symbiosis
- Coral reef ecology
Background:
- Coral reef invertebrates, particularly sponges, often host symbiotic microorganisms.
- Cyanobacteria are known primary producers in marine ecosystems.
Purpose of the Study:
- To investigate the prevalence and ecological significance of symbiotic cyanobacteria in common sponge species.
- To determine the net primary productivity of sponges hosting cyanobacteria.
Main Methods:
- Field surveys of sponge species on Davies Reef fore-reef slope.
- Measurement of oxygen production (photosynthesis) and consumption (respiration) in sponge tissues.
Main Results:
- Nine out of ten common sponge species harbored symbiotic cyanobacteria.
- Six of these species were identified as net primary producers.
- Photosynthesis rates were, on average, three times higher than respiration rates.
Conclusions:
- Symbiotic cyanobacteria are widespread in Great Barrier Reef sponges.
- These symbioses contribute significantly to sponge primary productivity and reef ecosystems.
- Morphological adaptations like flattening enhance light capture for phototrophic nutrition in sessile invertebrates.
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