 More than three dozen species of amphibians have been studied, with severe effects reported in more than 40 publications in peer-reviewed journals representing authors from North America, Europe and Australia. Experimental enclosure approaches to determine UVB effects on egg stages have been criticized; for example, egg masses were placed at water depths much shallower than is typical for natural oviposition sites. While UVB radiation is an important stressor for amphibians, its effect on the egg stage may have been overstated.
