Abstract
The life history, distribution, and abundance of a numerically dominant harpacticoid copepod, Huntemannia jadensis , was investigated on three intertidal sand beaches in Puget Sound, Washington, from January 1973 to September 1974. Abundance estimates based on five replicate 10 cm 2 core samples at weekly intervals had 95% confidence limits from 50% to 200% of the weekly mean. Most variability in abundance was associated with differences among tidal levels, with additional high variability between stations within a tidal level. Cohorts could be followed at a mean lower low water station on each beach and took about 6 months to mature. Two beachss produced one generation per year in summer, but the third beach had a major cohort in spring and a smaller cohort in winter. Instantaneous rates of population increase ranged from—0.30 to 0.22 per day in field populations. Differences in the sequence of cohort development among the three beaches were of sufficient magnitude that the ecological validity of selecting and single study area as a control site for comparative purpose is questioned.
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