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GROWTH RESPONSE OF SYMBODINIUM SPP. TO COMBINED TEMPERATURE AND UV RADIATION
Citation:
Rogers, J E. AND D. Marcovich. GROWTH RESPONSE OF SYMBODINIUM SPP. TO COMBINED TEMPERATURE AND UV RADIATION. Presented at ASLO 2004 Summer Meeting, Savannah, GA, June 13 - 18, 2004.
Impact/Purpose:
Conference presentation
Description:
Rogers, J.E. and D. Marcovich. In press. Growth Response of a Coral Symbiont, Symbiodinium sp., to Combined Temperature and UV Radiation Exposure (Abstract). To be presented at the ASLO 2004 Summer Meeting: The Changing Landscapes of Oceans and Freshwater, 13-18 June 2004, Savannah, GA. 1 p. (ERL,GB R985).
The combined effects of temperature and ultraviolet light (UVR; 280-400 nm) on the specific growth rate (SPR) of a clade A (A2) Symbiodinium sp. (JR02F1) was examined. Three temperatures (28, 31, and 33?C) and four levels of UVR (1.2, 7, 12, and 16 W/m2) were used. Individual experiments contained 4 treatments (2 temperatures with plus- and minus-UVR). A 28?C control was paired with either 31 or 33?C. UVR levels were established with 100W UVA lamps. A plexiglass cover provided the minus-UVR treatments. Analysis of the entire data set by Tukey's Studentized Range Test indicated that a significant (p=0.0026) interaction between temperature and UVR). Significant reductions in SPR were observed only at 33?C plus UVR levels of 7 and 12, and no growth was observed at 16 W/m2. The UVR test levels are typical of depths 3 to 20 meters in clear water. These results are consistent with field observations of coral bleaching during extended periods of elevated temperature, under clear skies and doldrum conditions (no wind) which maximize UVR exposure to corals.