Technical Evidence Review: Post-Release Survival Dynamics of Captive-Bred Atelopus Species
1. The Global Chytrid Crisis and the Atelopus Emergency The global decline of amphibians represents the most severe threat to vertebrate biodiversity in the modern era. Central to this collapse is the Neotropical genus Atelopus (Harlequin frogs), which has served as a primary victim and biological indicator of the panzootic. The emergency is driven by chytridiomycosis, an infectious disease caused by the aquatic fungal pathogen Batrachochytrium dendrobatidis (Bd). Since its virulent spread through Central America, Bd has systematically decimated populations, necessitating the establishment of captive assurance colonies as a final safeguard against total extinction. Chytrid Impact Profile Scale of Decline: Bd is associated with the estimated extinction of 90 species and has caused population declines exceeding 90% in at least 124 other amphibian species globally. Physiological Mechanism: The fungus infects the keratinized layers of the skin, leading to hyperkeratosis and sloug...