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Abstract
Determining the annual cycles of Marbled Murrelet (Brachyramphus marmoratus) behavior is crucial both for understanding the life history and for management of this species. In this paper we review available information on the annual patterns of behavior in forests throughout its range, with special emphasis on California. Data were derived from standardized forest surveys. Murrelet activity peaks during the summer (breeding season), is lower during the winter (non-breeding season), and absent or very low during transition periods (pre-alternate and pre-basic molts). Murrelets are regularly detected at some breeding stands even in the non-breeding season, however, birds are rarely observed flying through or below the forest canopy during this period. Vocalizations and flock size exhibit seasonal variation as well. While certain aspects of seasonal activity and behavior patterns conform with our limited understanding of its life history, much of the species’ behavior within the forest remains a mystery. Current guidelines for monitoring the Marbled Murrelet at inland sites restrict surveys for management purposes to the breeding season.
Parent Publication
Citation
O’Donnell, Brian P.; Naslund, Nancy L.; Ralph, C. John. 1995. Chapter 11: Patterns of Seasonal Variation of Activity of Marbled Murrelets in Forested 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. 117-128
