Overall, results obtained in this study have shown that phosphate enrichment mainly affected the coral symbionts, by decreasing their C:P and N:P ratios, while increasing their carbon, nitrogen, and phosphorus contents, as well as their specific growth rate, maximal photosynthetic efficiency of the PSII, and rate of photosynthesis normalized to chlorophyll content. Phosphate enrichment also affected the skeletal compartment, by increasing the skeletal growth and the P/Ca ratio. Conversely, few changes were observed in the animal host tissue.
The Godinot et al., 2011 citation leads to “Tissue and skeletal changes in the scleractinian coral Stylophora pistillata Esper 1797 under phosphate enrichment” is also interesting.
Here are the authors’ own highlights:
- We examined P enrichment’s impact on calcification and tissue composition in corals.
- We assessed a possible phosphorus limitation in symbiotic zooxanthellae.
- Photosynthetic efficiency, CNP contents, and specific growth of symbionts increased.
- Results indicated a phosphorus limitation of zooxanthellae growth in hospite.
- Skeletal growth rates and phosphorus incorporation into the skeleton also increased.
We’re making a new post for that story now. 🙂