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How healthy are Mt. Tam's natural resources?

 

Grassland Birds

Savanah Sparrow
Savanah Sparrow, of the Grassland Birds I Photo by Ken Schneider
Condition: Unknown
Trend: Unknown
Confidence: Unknown

Summary

The overall condition of grassland-associated birds is Unknown.

Point Blue Conservation Science was unable to assess patterns of abundance from 1996 to 2013 because data were insufficient for grassland-associated birds (see References below). This is likely because the data are primarily from Marin Municipal Water District lands of which grassland acreage is low and because grassland birds naturally occur in relatively low densities.

The need for a standardized monitoring program that covers all One Tam agency lands was identified as a critical data gap through this health assessment process. Because grassland birds are declining both regionally and statewide, additional surveys should be implemented to determine the condition of grassland birds in the One Tam region.

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References:

Cormier, R.L., Seavy, N.E. & Humple. D.L. (2014). Abundance patterns of landbirds in the Marin Municipal Water District: 1996 to 2013. Point Blue Report. Available here

Pitkin, M. & Wood, J. (Eds). (2011). The State of the Birds, San Francisco Bay. PRBO Conservation Science and the San Francisco Bay Joint Venture. Available from: http://data.prbo.org/sfstateofthebirds/uploads/State-of-the-Birds-San-Francisco-Bay-2011.pdf.

Shuford, W. D., & Gardali, T. (eds.). (2008). California Bird Species of Special Concern: A ranked assessment of species, subspecies, and distinct populations of birds of immediate conservation concern in California. Studies of Western Birds 1. Camarillo, CA: Western Field Ornithologists, and, Sacramento: California Department of Fish and Game. Available from https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=10513

Condition, Trend, and Confidence for Grassland Bird Species Included in This Analysis