Abstract
Abstract As part of the Department of Energy Ocean Margins Program, we examined the spatial and temporal variability in primary production and phytoplankton pigments during two cruises to the shelf waters between the Chesapeake Bay and Cape Hatteras. The first cruise was conducted in March 1996, reflecting well-mixed conditions just prior to the spring transition, while the second cruise was conducted during July 1996 when the water column was more stratified. During each cruise, primary production and high performance liquid chromatography (HPLC) pigments for the whole community and In March, production ranged from 0.50 to 0.65 g C m−2 d−1, with 52–62% of the production attributed to the smaller size fraction. About 50% of the total chlorophyll a (chl a) was found in the >8-μm size fraction. Pigment composition was dominated by chlorophylls a, c1 and c2, and fucoxanthin, indicating the importance of diatoms. In July, production was more variable, ranging from 0.38 to 2.09 g C m−2 d−1, with 41–83% of production attributed to the
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