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Native turtles return to Yosemite after removal of invasive bullfrogs
- Scientists from UC Davis studied the removal of invasive American bullfrogs at Yosemite National Park from 2016 to 2022 to observe native turtle recovery.
- The bullfrog invasive population, introduced in the 1950s and well-established by the 1970s, preyed on young turtles and disrupted native species in the park.
- After near eradication of bullfrogs at two of four study sites, researchers documented increases in northwestern pond turtles, including juvenile sightings starting in 2019.
- Senior author Brian Todd explained that American bullfrogs are considered highly invasive worldwide because they consume a wide variety of prey, basically anything small enough to fit into their mouths.
- The study suggests removing bullfrogs in priority conservation areas could help restore native turtle populations and freshwater ecosystem health despite challenges in eradication.
12 Articles
12 Articles
Good News Network
Natural History WanderingsNative Turtles Return to Yosemite After Being Overrun by Invasive Bullfrogs from the East
In Yosemite National Park, the eradication of non-native American bullfrogs has led to the return of California’s only native turtle species. The northwestern pond turtle has been proposed as a threatened species according to the US Endangered Species List, and their biggest threat is a frog from east of the Rockies. A UC Davis Ph.D. […] The post Native Turtles Return to Yosemite After Being Overrun by Invasive Bullfrogs from the East appeared f…
Removal of Invasive Bullfrogs Leads to Increase of Native Pond Turtles in Yosemite, Study Finds
By reversing a takeover by non-native species, native species have a chance at recovery in their natural habitats, according to a new study led by scientists from the University of California, Davis (UC Davis). The study, published in the journal Biological Conservation, explored how removing invasive bullfrogs could affect the native western pond turtles, which have experienced a major decline in their range. As UC Davis reported, the turtles h…
Officials celebrate astounding feat after removing more than 36,000 invasive lizards in mere months: 'A lot of people bought them as cute little pets'
Taiwan officials announced a huge win in the battle against invasive green iguanas in the country, removing thousands of the animals in just four months. Taiwan's Forestry and Nature Conservation Agency (FNCA) reported that it had removed 36,543 green iguanas in 2025 up until April, triple the number in the same period in 2024, according to Taiwan News. The FNCA utilized an app originally designed for reporting natural disasters threatening cro…
Native turtles return to Yosemite after removal of invasive bullfrogs
The call of American bullfrogs was deafening when scientists from the University of California, Davis, first began researching the impact of invasive bullfrogs on native northwestern pond turtles at Yosemite National Park.
American Bullfrog Removal Leads To Pond Turtle Recovery In Yosemite National Park - Reptiles Magazine
The American bullfrog (Rana catesbeiana) is an invasive species in Yosemite National Park, and they have eating the juvenile native Northwestern pond turtles (Actinemys marmorata) in the park, according to a study on the effects invasive bullfrogs have on the turtle populations in the park. Researchers at the University of California, Davis monitored the turtle populations from 2016 to 2022 at two sites in the park that also have bullfrogs prese…
The introduction of a species of invasive frogs into Yosemite Park The introduction of species into a living environment has not only good sides, especially when the latter is invasive. This is the case of American bull frogs, which were introduced in the 1950s into Yosemite Park, located in the Sierra Nevada Mountains, eastern California. Endemic of the North American East, this frog, also known as ouaouaron, is described by Brian Todd, lead au…
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