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Título

Production of chromophoric dissolved organic matter by marine phytoplankton

AutorRomera-Castillo, Cristina ; Sarmento, Hugo ; Álvarez-Salgado, Xosé Antón ; Gasol, Josep M. ; Marrasé, Cèlia
Fecha de publicaciónene-2010
EditorAmerican Society of Limnology and Oceanography
CitaciónLimnology and Oceanography 55(1): 446-454 (2010)
ResumenIncubation experiments with axenic cultures of four common phytoplankton species of the genera Chaetoceros, Skeletonema, Prorocentrum, and Micromonas were performed to test for the production of fluorescent dissolved organic matter (FDOM) by marine phytoplankton. Our results prove that the four species exuded both fluorescent protein-like and marine humic–like materials in variable amounts, with more production by the diatoms Chaetoceros sp. and Skeletonema costatum and less by Prorocentrum minimum. Whereas the exudation of protein-like substances by healthy phytoplankton cells has been recognized, the in situ production of marine humic-like substances is still a matter of debate. Using axenic cultures, we demonstrate unequivocally that phytoplankton can directly contribute to the autochthonous production of colored humic-like substances in the ocean. Extrapolation of these findings to the field indicates that about 20% of the marine humic–like substances produced in the highly productive coastal upwelling system of the Rıa de Vigo could originate from growing phytoplankton. Therefore, the exudation of FDOM by marine phytoplankton should be considered in future studies of the dynamics of colored DOM in marine systems
Descripción9 pages, 3 figures, 3 tables
Versión del editorhttp://dx.doi.org/10.4319/lo.2010.55.1.0446
URIhttp://hdl.handle.net/10261/20388
DOI10.4319/lo.2010.55.1.0446
ISSN0024-3590
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