Chytrid Infections Exhibit Historical Spread and Contemporary Seasonality in a Declining Stream-Breeding Frog

For the stream-dwelling foothill yellow-legged frog, Rana boylii, chytrid Infections’ (Bd) role in the species’ changing abundance across its endemic range (California and Oregon, USA) is not well-understood.

Through a holistic assessment of relationships between infection risk, geographical context and time, we identify the locations and time periods where Bd mitigation and monitoring will be critical for conservation of this imperilled species.