Preliminary estimates of harbor porpoise abundance in California waters from 2002 to 2007
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Preliminary estimates of harbor porpoise abundance in California waters from 2002 to 2007
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    "Four stocks of harbor porpoise are currently recognized in California waters, including one trans-boundary stock with Oregon. The stocks (from south to north) are: (1) Morro Bay, from Point Conception to Point Sur; (2) Monterey Bay, from Point Sur to Pigeon Point; (3) San Francisco-Russian River, from Pigeon Point to Point Arena; and (4) Northern California-Southern Oregon, from Point Arena to Lincoln City, Oregon (Figure 1). Stock boundaries are based on lines of evidence from molecular genetic differences (Chivers et al. 2002), pollutant concentration differences (Calambokidis and Barlow 1991), and density minima observed from aerial surveys (Forney 1991; 1995; 1999b). This document presents preliminary estimates of abundance for the Morro Bay, Monterey Bay, San Francisco-Russian River, and the Northern California portion of the Northern California-Southern Oregon stocks of harbor porpoise from 2002 to 2007 aerial line-transect surveys. Abundance for the entire Northern California-Southern Oregon stock will be estimated after results from 2002 and 2003 aerial line-transect surveys in southern Oregon are available. Previous estimates of abundance for these California stocks/strata are presented in Carretta and Forney (2004)"--Introduction.
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