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BIOLOGICAL WEIGHING FUNCTIONS FOR THE EFFECTS OF UV ON THE GROWTH OF CLADE A, B AND C SYMBIODINOUM ISOLATES CULTURED NEAR THEIR THERMAL LIMIT
Citation:
ROGERS, J. E. AND D. T. MARCOVICH. BIOLOGICAL WEIGHING FUNCTIONS FOR THE EFFECTS OF UV ON THE GROWTH OF CLADE A, B AND C SYMBIODINOUM ISOLATES CULTURED NEAR THEIR THERMAL LIMIT. Presented at 2007 ASLO Aquatic Sciences Meeting, Santa Fe, NM, February 04 - 09, 2007.
Impact/Purpose:
Conference abstract
Description:
Ultraviolet radiation (UV), especially at elevated temperatures, is known to adversely inhibit growth and photosynthetic activity of Symbiodinium spp., however the relative contributions of individual UV wavelengths to inhibition is not well understood. In this study, a series of exclusion filters was utilized to examine the effects of increasing UV bandwidth (280nm to 400 nm) on the growth of four Symbiodinium isolates cultured at temperatures within 1° C to 2° C of their thermal limit for growth. UV levels were selected from the range generally found with depth in high clarity waters of the tropics. Results from the exposures were used to develop biological weighting functions for growth inhibition. Growth near the thermal limit decreased as the exposure bandwidth increased over the range of exclusion filters; little change in growth was observed in the absence of UV or at lower reference temperature with UV exposure. Growth inhibition spanned wavelengths 290 nm to 340 nm with wavelengths near 315 being the most influential. Growth inhibition resulting primarily from UVB (280 – 320 nm) exposure is consistent with DNA damage being a major factor contributing to the reduction in growth