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Pathogenesis of Chytridiomycosis, a Cause of Catastrophic Amphibian Declines
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Pathogenesis of Chytridiomycosis, a Cause of Catastrophic Amphibian Declines
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Journal Article
Pathogenesis of Chytridiomycosis, a Cause of Catastrophic Amphibian Declines
2009
Overview
The pathogen Batrachochytrium dendrobatidis (Bd), which causes the skin disease chytridiomycosis, is one of the few highly virulent fungi in vertebrates and has been implicated in worldwide amphibian declines. However, the mechanism by which Bd causes death has not been determined. We show that Bd infection is associated with pathophysiological changes that lead to mortality in green tree frogs (Litoria caerulea). In diseased individuals, electrolyte transport across the epidermis was inhibited by >50%, plasma sodium and potassium concentrations were respectively reduced by approximately 20% and approximately 50%, and asystolic cardiac arrest resulted in death. Because the skin is critical in maintaining amphibian homeostasis, disruption to cutaneous function may be the mechanism by which Bd produces morbidity and mortality across a wide range of phylogenetically distant amphibian taxa.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Animal, plant and microbial ecology
/ Animals
/ Anura
/ Batrachochytrium dendrobatidis
/ Biological and medical sciences
/ Chloride Channels - metabolism
/ Chytridiomycota - pathogenicity
/ Conservation, protection and management of environment and wildlife
/ death
/ Dermatomycoses - drug therapy
/ Dermatomycoses - microbiology
/ Dermatomycoses - physiopathology
/ Electrolytes - administration & dosage
/ Frogs
/ Fundamental and applied biological sciences. Psychology
/ fungi
/ Heart Arrest - physiopathology
/ Litoria
/ Parks, reserves, wildlife conservation. Endangered species: population survey and restocking
/ Skin
/ Sodium
/ Sodium Channels - metabolism
