Measuring the health of Mt. Tam

Maintaining a healthy, vibrant and diverse Mt. Tam begins with understanding how key ecological resources are faring, and how we can better care for this iconic and beloved place.

One Tam partners and Bay Area scientists have come together to try to answer the question: How healthy are Mt. Tam's natural resources?

Climate-vulnerable Birds

Climate-vulnerable Birds

Photo by Charles Wohlers


The overall condition of climate change-vulnerable birds is Good.

Fully 33 species were considered vulnerable to climate change when using a published assessment for California or by examining projected changes in their local distributions (see References below). Of these, the vast majority were in Good condition in the One Tam area of focus.

This may be because the climatic and vegetation conditions used to project changes due to climate are not yet occurring in the One Tam region, or if they are there is a lag time in bird response. It is also possible that some species can adapt to changing conditions and hence not behave as predicted by changes in climate and vegetation alone.

Results for tidal marsh- and grassland-associated species were uncertain. For tidal marsh species in particular it would be desirable to obtain condition data given the added impact of sea level rise.

Condition, Trend, and Confidence for Climate Change-vulnerable Bird Species Included in This Analysis


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Gardali, T., Seavy, N. E., DiGaudio, R.T., & Comrack, L. A. (2012). A climate change vulnerability assessment of California’s at-risk birds. PLoS ONE, 7(3), e29507. Available from: