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. … But the ponds of Yosemite sound different today, with a chorus of native species making themselves heard. The researchers’ study, published in the May issue of the journal Biological Conservation, found that as the park was depopulated of bullfrogs, northwestern pond turtles began to return. The study suggests that removing invasive bullfrogs may be necessary in priority conservation areas to help pond turtle populations recover. 

Other invasive and endangered species news:

• AP News: A rare olive-colored fish that exists only in Nevada could soon be listed as an endangered species​
• Gunnison Country Times (Colo.): Aquatic nuisance species: What are they, why we care and what we do about them​