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Preliminary estimates of harbor porpoise abundance in California from 1999 and 2002
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  • Description:
    Abundance estimates of harbor porpoise in California waters based on 1999 and 2002 summer/autumn aerial line-transect surveys are presented. Pooled estimates of abundance (CVs in parentheses) for both survey years by area are: Morro Bay, N= 1,656 (0.39); Monterey Bay, N = 1,613 (0.42); San Francisco-Russian River, N = 8,521 (0.38); and Northern California, N = 12,889 (0.38). A total of 24,679 (0.37) porpoise are estimated in California waters, the highest total to date from aerial line-transect surveys in this region. An updated abundance for the Northern California/Southern Oregon stock will not be available until results from 2002/2003 surveys in southern Oregon are available. No statistically significant differences in abundance were found for the periods 1997-99 and 1999-2002 for any of the stocks/areas.
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