First record of the chytrid fungus in Lithobates catesbeianus from Argentina: exotic species and conservation

Chytridiomycosis, a disease caused by the chytrid fungus Batrachochytrium dendrobatidis (B.d.), isrecognized as one of the major factors of amphibian decline. Global trade of amphibians has been identified as oneof the causes of B.d. spread, involving hundreds of species world wide. In this work we detected the presence of B.d.through histological examination on 5 out of 9 analyzed specimens of bullfrogs (Lithobates catesbeianus) from afarm in Santa Fe City (Argentina), deposited since 1993 in the herpetological collection of the Provincial Museum ofNatural Sciences “Florentino Ameghino”. Our finding represents the oldest record of B.d. for Argentina and the firstcase of the chytrid fungus infecting the exotic bullfrog in this country. We emphasize the importance of determiningand monitoring the distribution and spread of B.d in Argentina, particularly in areas where feral bullfrog populationshave already been identified.