Incorporation of strontium (90Sr2+) into the skeleton of the hermatypic coralGalaxea fascicularis

✍ Scribed by Ip, Y. K. ;Krishnaveni, P.

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 434 KB
• Volume: 258
• Category: Article
• ISSN: 0022-104X
• DOI: 10.1002/jez.1402580219

✦ Synopsis

Abstract

The rate of ^90^Sr^2+^ deposition in Galaxea fascicularis was linear with respect to Sr^2+^ concentration (0.01–20 mM) and refractory to DCMU (1 μM), an inhibitor of photosynthesis. The deposition rate of ^90^Sr^2+^ in polyps incubated under a light intensity of 200 μE.m^−2^ s^−2^ was not significantly different from that in polyps incubated in total darkness. The deposition rate of ^45^Ca^2+^ (1–20 μM), on the other hand, exhibited saturation kinetics. In addition, it was DCMU sensitive and enhanced by light. Our results therefore support observations reported elsewhere that K~sr~^A^ is inversely correlated with growth rate in reef corals. However, Sr^2+^ and Ca^2+^ deposition in G. fascicularis does not appear to involve similar biochemical mechanisms.