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    Author(s): Nancy L. Naslund; Brian P. O’Donnell
    Date: 1995
    Source: 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. 129-134
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (267 KB)

    Description

    Patterns in the daily activity of Marbled Murrelets (Brachyramphus marmoratus) at inland sites has been studied throughout their range from California to Alaska. Murrelets are most active at inland sites around dawn, and to a lesser degree, at dusk. Throughout their range, peak levels of activity (detections) occur in the hour around dawn, but detections begin progressively earlier as one moves from south to north, corresponding to changing daylight regimes (e.g., California: 45 minutes before to 75 minutes after sunrise; Alaska: 90 minutes before to 40 minutes after sunrise). Timing of dawn detections also varies seasonally in relation to changing sunrise times. The duration of morning activity periods varies seasonally, being longest (2 hours) during summer and shortest (<1 hour) in winter. In all areas, weather conditions affect the timing, duration, and level of murrelet activity. In general, activity tends to begin later, last longer, and reach peak levels on cloudy or foggy mornings. The frequency of different behaviors varies throughout the morning period of activity. Murrelets tend to fly below the canopy more before sunrise than after, and group sizes become larger after sunrise. Early detections tend to include more silent birds, solitary calls, and wing sounds than later detections.

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    Citation

    Naslund, Nancy L.; O’Donnell, Brian P. 1995. Chapter 12: Daily Patterns of Marbled Murrelet Activity at Inland Sites. 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. 129-134

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