VirusType2
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National Geographic said:Amphibians lead double lives—one in water and one on land. Many begin life with gills, then develop lungs as they age. They are vertebrate animals that include frogs, toads, salamanders, and newts as well as odd, wormlike caecilians (seh-SILL-yuns). They are cold-blooded, using the environment to regulate their body temperature. Early amphibians were the first animals to leave the sea and venture onto land, forming a crucial link from fish to terrestrial reptiles.

“Frogs are often referred to as a barometer or a bellwether because they live both in water and on land, so they are vulnerable to or affected by both environments,” Argo said. “At the same time, amphibians have been on the planet for 360 million years, and as one of the scientists in my film put it, they are tough customers. So you can say they are sensitive to all these environmental pressures, but its not just a light environmental pressure on them, they are just getting everything heaped on them at once, and that seems to be why we are losing them.”
When climates change, and drought happens, breeding ponds and creek beds dry up. Frogs, who breathe air and drink water through their skin, are very sensitive to contaminated water supplies. The last straw, it seems, is the deadly (to frogs, not humans) chytrid fungus that has spread all over the world
"Low frog populations wreak havoc on food chains; fish love tadpoles and everything from small birds to large-land carnivores eat frogs. But the loss is even greater in scope: some species of frogs produce chemicals in their skin that could hold the cures for major diseases; Argo said a new, more powerful and nonaddictive alternative to morphine was recently developed based on chemicals produced by these frogs. Other mysterious creatures, including the Boreal Chorus Frog found in Jackson Hole that actually freezes solid during the winter and thaws back to life in the spring, have capabilities that are still not completely understood by scientists."
BTW I saw that frog freeze for winter then thaw out on a National Geographic special of Alaska. Simply amazing. It's blood produces a sugar of some sort that prevents it's vital organs from freezing.
Chytridiomycosis has been linked to dramatic population declines or even extinctions of amphibian species in western North America, Central America, South America, eastern Australia, and Dominica and Montserrat in the Caribbean. The fungus is capable of causing sporadic deaths in some amphibian populations and 100% mortality in others. There is no effective measure for control of the disease in wild populations. The disease is contributing to a worldwide decline in amphibian populations, a worldwide decline of species that apparently has affected 30% of the amphibian species of the world
Some researchers contend that the focus on chytridiomycosis has made amphibian conservation efforts dangerously myopic. In Guatemala, for example, several thousands of tadpoles perished from an unidentified pathogen distinct from B. dendrobatidis [9]. Such researchers stress the need for a broader understanding of the host-parasite ecology that is contributing to the modern day amphibian declines.
Fungus epidemic
Global warming
Destruction of habitat
Water and Air Pollution
