Type of Document:
Winter bird population surveys were conducted at Olema Marsh from 1984-1991. These surveys used spot mapping to quantify the total number of individuals encountered on each of several (usually eight) complete surveys of the marsh. To generate more current information on bird use in Olema Marsh and to more effectively measure the densities and occurrence of wintering marsh birds, we conducted a series of point counts in January-February of 2005. Additional point-count surveys were conducted during the previous spring and autumn periods. Although we included detection distances in all counts to allow for the estimation of detection probabilities and bird densities, this report presents only the uncorrected point-count totals as indices of species abundances.
Stallcup, R. W., and J. P. Kelly. 2005. Point-count surveys of bird use in Olema Marsh: Winter 2005. A report to the Point Reyes National Seashore. ACR Tech. Rpt. 2004-2-2. Audubon Canyon Ranch, P.O. Box 808, Marshall, CA 94940.