Population trends of the common murre (Uria aalge californica)

Information and Technology Report 2000-0012-2
By: , and 
Edited by: David Allen ManuwalHarry R. CarterTara S. Zimmerman, and Dennis L. Orthmeyer



Population trends for the common murre (Uria aalge californica) were determined from available whole-colony counts of murres in California, Oregon, Washington, and British Columbia from 1800 to 1995.From 1800 to 1978, historical counts were sporadic and not standardized. From 1979 to 1995, standardized whole-colony counts from aerial photographs were conducted in many years in California, Oregon, and Washington. In contrast, no aerial photographs of murre colonies in British Columbia have been taken and only a few other whole-colony counts have been conducted. Direct comparisons and statistical treatment of whole-colony counts were conducted using 1979-95 data. Complete data for all colonies were available only in 1988-89 when the breeding murre population was estimated to be 1.1 million, about 5-8% of the world population and 13-28% of the Pacific Ocean population. A summary of various natural and anthropogenic factors affecting murre populations in western North America since 1800, and particularly in 1979-95, also is provided.

Publication type Report
Publication Subtype Federal Government Series
Title Population trends of the common murre (Uria aalge californica)
Series title Information and Technology Report
Series number 2000-0012
Chapter 2
Volume 1
Year Published 2001
Language English
Publisher U.S. Fish and Wildlife Service
Contributing office(s) Western Ecological Research Center
Description 100 p.
Larger Work Type Report
Larger Work Subtype Federal Government Series
Larger Work Title Biology and conservation of the common murre in California, Oregon, Washington, and British Columbia. Volume 1: Natural history and population trends (Information and Technology Report 2002-0012)
First page 33
Last page 132
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