Distribution of chiorophylls and phaeopigments in the Northwestern Atlantic Ocean |
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| Authors: | Trees Charles C; Bidigare Robert R; Brooks James M |
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| Institution: | Department of Oceanography, Texas A&M University, College Station TX 77843, USA
1Present address: Visibility Laboratory, P003, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA |
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| Abstract: | During a cruise in the Northwestern Atlantic the distributionsof chlorophylls and phaeopigments were investigated in relationto mesoscale features by high-performance liquid chromatography.Samples were collected from hydrographic Stations and from twoContinuous underway sampling systems fished simultaneously atthe surface (2 m) and at deeper (30–90 m) depths. Highestpigment concentrations were associated with the transitionalzones between Slope Water, the Gulf Stream and Northern SargassoSea. Chlorophyll b occurred in 47% of the samples analyzed andthe dominant chlorophyll a degradation product was phaeophorbidea. Chlorophyllide a was usually found at low concentrationsand phaeophytin a levels were undetectable. Concentrations ofthe various chlorophylls and their degradation products wereused to infer Changes in taxonomic composition, phytoplanktonbiomass and zooplankton grazing pressure across several frontalzones. |
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