Tuolumne County Profile - Community Indicators Project 2008
Tuolumne County Profile Introduction Health and Safety Education and the Arts Natural Resources and Recreation Economy and Infrastructure Appendices Conclusion Acknowledgements

Wildlife - Winter Bird Count

Why is this important?

Bird populations are indicators of the complexity and general biological health of our local ecosystem. Numerous species are adapted to particular areas and habitats. If an area becomes less suited for a species, the number will decrease; if more suited, numbers will increase.

What is the measure?

Audubon Society chapters annually conduct a winter bird count. Teams of birdwatchers select the same date, as near as possible, and survey the same locations each year to tally the types of species and numbers. The total bird count reflects on both local and regional habitats as most species do have some form of migration. Birds will migrate either up or down the Sierra slope, and some migrate long distances to other regions of the Western Hemisphere. The survey is not an exact count of every bird, but it is a sampling procedure of bird populations.

How are we doing?

The annual count shows a variation of 1,000 to 2,000 each year from The Central Sierra Audubon Chapter long-term database on nearly 20,000 birds counted in one day. The average for the last five years is 19,565 birds. This information suggests relative stability in bird populations.

The total eagle counts from Lake Don Pedro show change from year to year. Some of this variation is due to sampling problems from counting birds in small populations. We are witness to Bald Eagles recovering from near extinction as they repopulate our region.

Source(s): http://www.centralsierraaudubon.org/

Tuolumne County
Eagle and Osprey Count - January


Eagle Perched

Community Indicators Project
Tuolumne County - Central Sierra Mountains