Summary
To summarize, Common Murres bred at only two of six historically documented
colonies in British Colombia, Canada in 2003 and 2004. Numbers at Triangle
Island, the larger of the two active colonies, were about 27% lower in 2003 than in
1989. The lower number may reflect a true population decline, but if so, one of
unknown cause and timing. In addition, the distribution of breeding birds around
Triangle Island changed between 1989 and 2003: a number of small satellite
colonies were abandoned, but more birds bred on the main colony. That
redistribution may reflect changes in the raptor population and behavioural
dynamics.
http://www.marineornithology.org/PDF/33_1/33_1_67-69.pdf
Notes
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