Paul Stephen Corn
1998
<p><span>Field exposures of </span><i>Bufo boreas</i><span> embryos to fractions of ambient UV-B radiation at two sites in Rocky Mountain National Park, Colorado, USA, were conducted to evaluate UV-B as a possible cause of recent severe declines of this species. There were no differences in hatching success of </span><i>B. boreas</i><span> embryos exposed to 0–100% of ambient UV-B radiation at either study site, results that are different from those of recent studies in Oregon that found increased mortality of </span><i>B. boreas</i><span> embryos exposed to ambient UV-B. The reasons for these differing results are not apparent, and several possible explanations exist, including differences in experimental design, presence or absence of a pathogenic fungus, and geographic genetic variation. </span><i>Bufo boreas</i><span> embryos were probably not receiving higher doses of UV-B radiation during the experiments in Oregon compared to the experiments in this study. Results of this study do not support UV-B radiation alone as the cause of the decline of </span><i>B. boreas</i><span> during the past 20 yr in the southern Rocky Mountains, but UV-B cannot be dismissed because of the contradictory results from other studies.</span></p>
application/pdf
10.1890/1051-0761(1998)008[0018:EOUROB]2.0.CO;2
en
Ecological Society of America
Effects of ultraviolet radiation on boreal toads in Colorado
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