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At-Sea Activity and Diving Behavior of a Radio-Tagged Marbled Murrelet in Central California

Laird A. Henkel, Esther E. Burkett and John Y. Takekawa
Waterbirds: The International Journal of Waterbird Biology
Vol. 27, No. 1 (Mar., 2004), pp. 9-12
Published by: Waterbird Society
Stable URL: http://www.jstor.org/stable/1522480
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
At-Sea Activity and Diving Behavior of a Radio-Tagged Marbled Murrelet in Central California
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Abstract

Radio-telemetry was used to continuously monitor the at-sea activity of an adult Marbled Murrelet (Brachyramphus marmoratus) nesting in Santa Cruz County, California. From 05.39 h on 28 May 1997, to 05.14 h on 29 May 1997, the murrelet was followed by tracking teams at Año Nuevo Bay. Between 05.44 h and 20.19 h on 28 May, the bird engaged in eleven dive bouts, with a mean duration of 18.8 ± 5.4 min. Mean dive duration was 24.8 ± 15.7 s; mean surface between dives was 15.2 ± 12.7 s. No dives were initiated after 20.19 h. The bird spent 12.3% of the at-sea period and 23.4% of daylight hours engaged in diving bouts. This relatively small amount of time spent diving allows for considerable flexibility in activity budget.

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