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Write Your Own Reviews Only registered users can write reviews. Are you sure? Yes No. Much of it was harvested and later developed, but certain areas like Mount Sutro were left with this tightly packed foreign forest. The now acres were designated an Open Space Reserve by its current owner, U. San Francisco, in Despite the main forest being non-native, other native understory plants like ferns, elderberry, and poison oak thrive.
And because of decades of hard work by groups like the Sutro Stewards and the Rotary Club, the summit area in particular is a paradise full of the native plant species our local birds love. Work began by removing the dead and dying trees in target areas of the mountain.
UCSF contracted Golden Gate Audubon Society to perform a bird survey to monitor the impact of the work on bird populations, and starting in , Lepidoptera butterflies and moths were added to the survey. For bird monitoring, UCSF identified 13 plots throughout the Open Space Reserve, representing the different forest types in terms of vegetation health. Twice per month, a surveyor starts one hour after sunrise, visiting each of the 13 plots for a stationary period of minutes per plot.
Each bird seen or heard is documented, as is any important breeding behavior. We hope to find out how bird life changes in response to the vegetation changes. When trees are removed, how does that impact bird populations? How much time passes after major tree work before birds return for key activities like foraging and breeding? Comparing plots against each other, and using the multiple plots to substantiate conclusions from others, do more birds return to the areas with more native trees planted?
But one conclusion is already clear: Mount Sutro is a bird and butterfly oasis. Over the course of the two years, 61 bird species have been observed. Of those, 15 species have been confirmed to be breeding observations of adult birds carrying food or nesting material, and active nest, or dependent fledglings.
Another nine species are possibly or probably breeding documented in suitable nesting habitat, singing in suitable habitat, or carrying out courtship behavior, breeding displays, or copulation. In , 20 species of Lepidoptera were observed on the mountain, out of 34 species found in San Francisco more broadly.
Most remarkably, a rare Pale Tiger Swallowtail was observed on the summit in May.
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