Bull and Hayes looked at the possible effects that the presence of cattle can have on the reproduction of the Columbia spotted frog. They searched for the presence and abundance of egg masses along grazed and ungrazed ponds as well as the amount of recently metamorphed frogs. The authors found no difference in the abundance of egg masses between grazed and ungrazed sites. They actually found that 6/8 of the most productive sites were in ponds within grazed areas. Bull and Hayes concluded that their study revealed no negative effects of grazing on the Columbia spotted frog, but emphasized that further research is necessary, with a special focus on the effects at varying grazing intensities and times.
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