The Cascades Frog
(Ram cascadae) and Northern Red-legged Frog (Rana aurora) are the only 2 species in the region that overlap with Oregon Spotted Frogs with which egg mass appearance might be confused; similarity is especially high in the case of the Cascades Frog
(see Briggs 1987).
For a second amphibian, the Cascades frog
- known to be among the least UV-sensitive Pacific Northwest species - the researchers found no instances where eggs received lethal doses.
Most wetlands will have buffers at least 150 feet wide to protect habitat for such species as the northwestern pond turtle (Clemmys marmorata) and the Cascades frog
Others include extinction of the golden toad in Costa Rica, massive egg mortalities of the Cascades frog
in Oregon, and amphibian declines in Europe, South America, Asia, and Africa.
Not far from the Willamette Valley, in the Cascades Range of Oregon, the Cascades frog
(Rana cascadae) and the Western toad (Bufo boreas) are disappearing, even though their habitat has not been significantly disturbed or polluted.
Of those 10, he found that the three with the best ability to repair or resist UV-B radiation were the Pacific tree frog, the Western toad and the Cascades frog
In high-elevation habitats the Oregon Gartersnake also feeds on Cascades Frogs
, and perhaps as a consequence lake basins with the Oregon Gartersnake had significantly lower Cascades Frog
densities than did basins lacking the Oregon Gartersnake (Pope and others 2008).
In the northwestern United States, the Cascades frog
and the western toad are suffering reduced breeding success because of increased levels of ultraviolet-B radiation - now penetrating a thinned ozone layer - which destroys their eggs in the species' high-altitude breeding pools.
Tough and elusive, Cascades frogs
live only in alpine wetlands in the Pacific Northwest and are rarely found below 2,000 feet in elevation.