The effect of external nutrient resources on the optical properties and photosynthetic efficiency of Stylophora pistillata

Autor: Zvy Dubinsky, Noga Stambler, Leonard Muscatine, Paul G. Falkowski, Moshe Ben-Zion, L. R. McCloskey
Rok vydání: 1990
Předmět:
Zdroj: Proceedings of the Royal Society of London. B. Biological Sciences. 239:231-246
ISSN: 0080-4649
DOI: 10.1098/rspb.1990.0015
Popis: Enrichment of the hermatypic Red Sea coral Stylophora pistillata with dissolved inorganic nitrogen, inorganic nitrogen + phosphorus, and feed­ing on Artemia , all led to increases in areal pigmentation in comparison with control colonies. These increases, unlike photoadaptive ones, resulted from growth in cell numbers ranging from × 2.75 in the Artemia -fed to × 4.85 in the N + P-enriched corals. The treated corals absorbed 51-85% of incident light, whereas the controls absorbed only 33%. Areal photosynthesis increased with treatment, although to a lesser degree than absorptivity. This difference resulted in reduced photosynthetic effici­encies in the treated colonies. Photosynthetic rates, calculated on a percell basis, were inversely correlated with algal densities, indicating poss­ible competition among the algae for CO 2 .
Databáze: OpenAIRE