Abstract
Total biomass of the fiddler crabsUca pugnax andU. minax in fourSpartina marshes in the lower Cape Fear River estuary, North Carolina, declined by 65 to 70% between the summers of 1974–1975 and 1976–1977 with no significant decrease in population density; there was evidence of a recovery in summer of 1978 to the 1974–1975 levels. The cause of these fluctuations is unknown, but such a degree of variability in intertidal populations emphasizes the need for caution in using one- or two-year baseline studies to evaluate potential environmental impacts.
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