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• W2116728106 abstract "Dissolved organic matter (DOM) production was examined in axenic batch cultures of five coastal diatom species. For Chaetoceros decipiens, dissolved organic carbon (DOC) accumulated beginning in late exponential growth as a result of increased cell density. For Cylindrotheca closterium, DOC actually decreased in late exponential growth and reached zero by the end of the experiment. This coincided with continued particulate organic carbon (POC) production and a threefold increase in the per-cell concentration of transparent exopolymer particles after nutrients were depleted. DOC release rates varied between species but were significantly higher for all five species in exponential or transition growth than during stationary growth. On average, 5% of the total fixed C was released as DOC for four of the diatoms, whereas C. decipiens released ,21% of its fixed C as DOC. The percentage of fixed C released as DOC varied little with nutrient availability or diatom growth stage. The DOM produced by some diatom species adheres to filters and is measured in the particulate organic matter (POM) fraction when cells are separated from the medium by filtration. This may be an important problem when diatom species with known benthic life histories are prevalent. In contrast, for species like Chaetoceros that have no benthic life history, DOM release rates estimated by bulk measurements or 14C appear to be accurate. Overall, these results indicate that the species composition of phytoplankton blooms has the potential to influence the relative importance of POM and DOM production and can complicate interpretation of those measurements. Diatoms are ubiquitous in surface water of the world’s oceans. They are capable of fast growth relative to other phytoplankton taxa and are well adapted to form large blooms in high-nutrient coastal systems and in oceanic systems that are subjected to pulses of nutrients (Margalef 1978). Indeed, diatoms are the largest contributor to oceanic primary production and new production (e.g., Dugdale and Wilkerson 1992; Sarthou et al. 2005). Given the magnitude of diatom production relative to other phytoplankton taxa in the ocean, their fate has important implications for global carbon (C) and nitrogen (N) cycles. For instance, diatoms are capable of relatively rapid sinking rates, both as individual cells and in aggregates, and are responsible for a significant portion of the sinking C flux out of the euphotic zone (Smetacek 1985). Diatoms are also an important component of marine food webs, fueling both pelagic (Ryther 1969) and benthic secondary production (Graf 1992). Several recent studies have shown that the dissolved organic matter (DOM) pool may be an important, but overlooked, fate for fixed C and N. For instance, in highproductivity upwelling systems where diatoms dominate" @default.
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• W2116728106 date "2007-03-01" @default.
• W2116728106 modified "2023-10-14" @default.
• W2116728106 title "Release of dissolved organic matter by coastal diatoms" @default.
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• W2116728106 doi "https://doi.org/10.4319/lo.2007.52.2.0798" @default.
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