Does temperature and UV exposure history modulate the effects of temperature and UV stress on symbiodinium growth rates?
Temperature and ultraviolet radiation (UVR, 280–400 nm) alone or in combination are known to inhibit the growth of Symbiodinium spp. isolates. This conclusion was drawn from a number of studies having widely different exposure scenarios. Here we have examined the effects of preexposure "acclimation" conditions (photosynthetically active radiation (PAR), UVR, and temperature) on the growth of four Symbiodinium isolates exposed to elevated temperature and UVR combination. The type A2 isolate was the least sensitive to temperature and UVR stress. Preexposure to elevated temperature led to decreased sensitivity to sublethal temperature exposure for one of the three type B1 isolates (B64). For isolate JR22 preexposure to elevated temperature resulted in greater sensitivity to UVR whereas preexposure to elevated temperature plus UVR decreased sensitivity to UVR exposure. For three of the isolates (JR02F1, B146 and JR22) acclimation did not markedly reduce the impacts of either temperature or UVR. For the three isolates JR02F1, B64, and B146 where LL (PAR; 90 μmol m−2 s−1) and HL (PAR; 700 μmol m−2 s−1) acclimated cultures were compared little or no effect of light level was observed in subsequent exposures to temperature and UVR stress. Our results suggest that thermal or UVR stress history, in the context of the coral reef environment, may reduce coral bleaching at sublethal temperatures and UVR levels, but may or may not enhance coral survival near the upper thermal limit for coral lethality.
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Document Type: Research Article
Publication date: 2010-07-01
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