Many amphibians are considered key species or marker species. And these animals are particularly sensitive to their environment and ecosystem. They are called this because their well being as a species generally represents how their current environment is doing, if they are stressed so is their habitat and this is generally directed towards biodiversity, because variety means an easier life. And since biodiversity over the past several years as been declining so has the amphibians, at a rather severe rate.
"Loss of Biodiversity and Extinctions." - Global Issues. N.p., n.d. Web. 09 Mar. 2016.
"Loss of Biodiversity and Extinctions." - Global Issues. N.p., n.d. Web. 09 Mar. 2016.