Yosemite Toad Strategy Changes After Fungal Discovery

Managers now release older captive-reared toads to combat winter fungal infections in the Sierra Nevada.

Updated on Oct. 20, 2026 in National Parks

A small Yosemite toad sits on a mossy granite rock near a clear, cold alpine stream in the Sierra Nevada mountains. — Yosemite National Park managers have adjusted their reintroduction strategy for the threatened Yosemite toad to improve survival rates against fungal infections. AI Illustration. Upload story photo >

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Researchers discovered that young Yosemite toads face high infection rates from the fungus Batrachochytrium dendrobatidis during winter dormancy. As a result, park managers have adjusted their reintroduction strategy to keep captive-reared toads longer before release.

Why it matters

The change aims to improve survival rates, as older toads are less susceptible to the deadly fungus that has contributed to the species' decline. Protecting these amphibians is critical, as the population remains at only half of its historical occupancy.

Researchers analyzed 1,800 skin samples across six study sites in the Sierra Nevada mountains. The species inhabits elevations reaching 12,000 feet, with current occupancy levels currently at approximately 50% of historical ranges.

The players

Yosemite National Park

This protected area in the Sierra Nevada mountains serves as a primary research site for threatened toad species conservation.

UCLA

This academic institution conducted the research on fungal infection patterns within the toad populations.

The details

The Yosemite toad, which gained federal threatened status in 2014, has been monitored by Yosemite National Park since 2009. Data collected between 2021 and 2023 showed that juvenile toads are particularly vulnerable when emerging from their winter sleep.

Yosemite began monitoring toad populations in 2009.
The species received federal threatened status in 2014.
Researchers collected 1,800 skin samples from 2021 through 2023.
UCLA issued a research announcement on October 1, 2026.

The Big Picture

This research follows the conservation framework established by the Endangered Species Act's threatened status provisions for the Yosemite toad. It adapts current management practices to account for emerging environmental stressors identified during the study period.

Visitors to high-elevation areas in Madera and Mariposa counties should adhere to all posted signage to protect sensitive, federally designated critical habitats. These measures help prevent the accidental spread of pathogens into the alpine environments where these threatened toads reside.

The takeaway

Wildlife management requires adaptive strategies as environmental factors like fungal diseases shift over time. Monitoring and adjusting reintroduction programs is vital for the survival of endangered species in protected mountain habitats.