Chapter 13: Interannual Differences in Detections of Marbled Murrelets in Some Inland California Stands

Abstract

I compared the mean level of detections of Marbled Murrelets by month over five years at three inland sites in northern California. These areas all have relatively high levels of detections. There were no significant differences in mean detection levels year to year at any site, and for any month with the exception of April at one site. This lack of evidence for significant interannual variation in the number of detections of birds suggests that data from any one of the years would have been sufficient to detect occupancy of these stands by Marbled Murrelets. Caution must be used in applying this result, as interannual variation in detection rates may be greater at sites with relatively few birds, and only three sites were investigated in this study.

Parent Publication

• Ecology and conservation of the Marbled Murrelet

Citation

Ralph, C. John. 1995. Chapter 13: Interannual Differences in Detections of Marbled Murrelets in Some Inland California Stands. In: Ralph, C. John; Hunt, George L., Jr.; Raphael, Martin G.; Piatt, John F., Technical Editors. 1995. Ecology and conservation of the Marbled Murrelet. Gen. Tech. Rep. PSW-GTR-152. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; p. 135-138