The blue-sided tree frog has suffered a precipitous decline in its population, with an estimated 50 percent or more loss in population since the 1990s. Some factors believed to have contributed to this sharp decline are the international pet trade, the fungal disease chytridiomycosis, and larvae predation by an introduced fish species (1).
The blue-sided tree frog is a popular species in the international pet trade, along with other frogs in the genus Agalychnis. In 2007, the United States alone was reported to have imported 221,960 Agalychnis frogs over the previous decade (4).
Another major threat to this species comes from chytridiomycosis, an aggressive fungal disease that prevents respiration in amphibians. The fungus that causes chytridiomycosis can be found in most habitats suitable for the blue-sided tree frog. The blue-sided tree frog is now limited to the disturbed and polluted habitats surrounding San José, purportedly due to the frog’s greater ability than the fungus to withstand pollution (1).
In addition to these threats, populations of the blue-sided tree frog face another obstacle in an introduced fish, Xiphophorus hellerii, which preys on the larvae of the frog (1).