Ready, Set, Reintroduce!

Originally posted on the San Francisco Bay Area National Parks Science and Learning Blog

The Presidio’s Mountain Lake restoration is moving forward this year with several native species reintroductions. The Sierran chorus frog (Pseudacris sierra), is slated to be the first species reintroduced. This species was extirpated from the Presidio sometime in the 20th century and, although common throughout its range, has become very rare in the city of San Francisco. The first phase of the reintroduction will take place in February, when chorus frog egg masses will be placed in protective enclosures to keep them safe from predators as they acclimate to Mountain Lake. The tadpoles that hatch in those enclosures will then be released into Mountain Lake in March. Later in the year, threespine stickleback and the Western Pond turtles will also be reintroduced to the lake.

Underwater view of a Pacific chorus frog.


Reintroduction projects offer a wide range of opportunities for scientific exploration and citizen science engagement, so the Presidio Trust has been partnering with several organizations and institutions to broaden impact and expand knowledge in the fields of reintroduction biology and urban ecology. For instance, partners at Stanford University just published research on the potential to achieve improved water quality from the reintroduction of freshwater mussels, and the California Academy of Sciences produced an excellent video on the Mountain Lake restoration, including upcoming species reintroductions. Keep an eye on the Presidio Trust website and social media for more reintroduction-related news and events throughout 2015. It’s an exciting time in the history of Mountain Lake!

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