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Oceanography and Atmospheric Sciences and Meteorology
Biologically Available Nitrogen; Dinoflagellate Alexandrium Catenella; Dissolved Organic-Matter; Marine-Phytoplankton
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Full-Text Articles in Physical Sciences and Mathematics
Uptake Of Spartina-Derived Humic Nitrogen By Estuarine Phytoplankton In Nonaxenic And Axenic Culture, Jh See, Da Bronk, Aj Lewitus
Uptake Of Spartina-Derived Humic Nitrogen By Estuarine Phytoplankton In Nonaxenic And Axenic Culture, Jh See, Da Bronk, Aj Lewitus
VIMS Articles
Humic substances are a collection of colored organic acids characterized by high molecular weight and low nitrogen (N) content that are thought to be biologically recalcitrant. We examined a suite of nonaxenic estuarine phytoplankton isolates to determine their ability to take up N-15-labeled humic substances formed in the laboratory and supplied as the sole N source. All 17 estuarine and coastal strains took up the added humic N, but the one polar isolate did not. Two of the coastal isolates (Heterosigma akashiwo and Fibrocapsa japonica) could take up the humic N in nonaxenic culture but not in axenic culture, suggesting …