Fig. 16.22 (a) Location of CalCOFI sampling lines in the southern California (SoCal)
region (Point Conception to San Diego and seaward to 124°W). (b) Time-series of
zooplankton displacement volume estimates from CalCOFI samples in the SoCal
region. Total volume (•);volume of animals <5 cm long ( ); vertical double lines are
standard errors; vertical bars are suggested times of regime shifts, less certain,
especially for the California Current in 1989 (dot–dash). (Graph by M. Ohman.) (c)
Sea-surface temperature time-series from SoCal, showing the step-like increase of the
1970s. (d) Time-series of annual means of the Pacific Decadal Oscillation index. (b &
c from Mackas & Beaugrand 2010; d plotted from tables maintained by Nathan
Mantua: http://jisao.washington.edu/pdo/PDO.latest.)
Rebstock (2001a & b) reanalyzed a selected set of southern California CalCOFI
samples from 49 years, estimating the abundance of dominant copepod species. She
found that species composition did not vary in the long term, although there were