Effects of enhanced mid-ultraviolet radiation (290-315 NM) on development and survival of Boreal toad (Bufo boreas boreas) tadpoles Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/np193d01n

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  • More than 3700 fertilized toad eggs were used in a series of studies designed to determine the effects of UV-B radiation (290- 315 nm) on temporal developmental patterns, systematic development and viability prior to metamorphic climax. The eggs were exposed to radiation from either "white-light" fluorescent lamps (Vita-Lite, Duro-Test Corporation, North Bergen, New Jersey) or "white-light" fluorescent lamps plus fluorescent sunlamps (Westinghouse- FS40). Several radiation exposure schedules were utilized (chronic or varied, daily exposures) and, in all but one study, filters were utilized - Kodacel cut-off filters to transmit wavelengths longer than 290 nm and Mylar cut-off filters to transmit wavelengths longer than 315 nm. These filters provided a transmission "window" in the UV-B region. Exposure of the developing tadpoles on a daily basis to eleven or more Sunburn Units of UV-B radiation per day resulted in the development of tadpole populations with lordotic posture, hyperplasia in the presumptive cornea and other dorsal epithelial tissue, increased pigmentation in the presumptive cornea, desquamation of areas of the dorsal surface, and increased mortality. Exposure of the tadpoles on a daily basis to 4.4 Sunburn Units of UV-B radiation per day resulted in a significant lengthening of the time periods required to achieve metamorphic climax. Biological photoreactivation of ultraviolet damage was demonstrable with three groups of tadpoles exposed to comparable daily exposures of UV-B radiation (11.0 Sunburn Units per day) at a comparable rate (1.1 Sunburn Units per hour) from similar sources. The critical differences between the groups was the duration of exposure to UV-A and visible radiation (0, 2 and 4 hours) following the termination of the UV-B exposure.
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