Amphibian Chytrid Disease and Population Welfare

Chytridiomycosis, caused by the fungus Batrachochytrium dendrobatidis, has caused the extinction or severe decline of hundreds of amphibian species and causes individual welfare harm at mass scale.

Key Facts

Bd chytrid fungus has caused the greatest vertebrate extinction wave in recorded history
Over 500 amphibian species have declined significantly due to chytridiomycosis
The disease causes thickening of the skin, impairing ion regulation and causing cardiac arrest
UK native species are less susceptible than tropical frogs but still affected
Biosecurity at field sites - decontaminating boots and equipment - reduces spread between populations
Captive insurance populations of critically affected species are maintained in zoos globally

Welfare Considerations

Chytrid disease causes serious welfare harm in affected amphibians. Skin thickening from fungal infection disrupts the osmoregulation that frogs and salamanders depend on for survival - they effectively die from electrolyte imbalance as their skin function fails. This is a slow, debilitating process. Wild populations experiencing disease front spread may see mass mortality events affecting thousands of individuals simultaneously. Biosecurity measures prevent iatrogenic spread by humans - visiting multiple amphibian sites without decontamination can introduce the pathogen to previously unaffected populations, causing preventable welfare harm at scale.

What You Can Do

Decontaminate boots and field equipment between amphibian monitoring sites
Support Amphibian Ark's captive assurance colony programme for critically affected species
Report UK amphibian disease or die-off events to ARC for monitoring
Back probiotics research that may help amphibians resist Bd infection
Avoid introducing amphibians from one water body to another