Proportion of marine organic carbon present in self-assembled gels along the subtropical front and its increase in response to reduced pH

Baltar, Federico; Currie, Kim; Meyer, Moana; Verdugo, Pedro

doi:10.1016/j.marchem.2016.05.014

Cited by 6 publications

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“…Los precursores orgánicos disueltos en el mar pueden coagular en condiciones de fuerte turbulencia y pronunciados gradientes de salinidad (Stoderegger y Herndl 1999, Engel 2000, Surge y Lohmann 2002. Otros factores que influyen en la formación o desintegración de las PET son el pH, la disponibilidad de cationes (como Ca 2+ y Mg 2+ ) y la temperatura (Chin et al 1998, Baltar et al 2016. Aunque se sabe poco sobre su arquitectura mecánica y su composición química, las PET son abundantes en polisacáridos ácidos ricos en carbono que contienen algunos grupos reactivos (carboxilo y sulfato de semiéster) (Passow 2002).…”

Section: Introductionunclassified

“…Marine dissolved organic precursors may coagulate under conditions of strong turbulence and pronounced gradients of salinity (Stoderegger and Herndl 1999, Engel 2000, Surge and Lohmann 2002. Other factors that have been shown to influence the formation or disintegration of TEP are pH, cation availability (such as Ca 2+ and Mg 2+ ), and temperature (Chin et al 1998, Baltar et al 2016. Although little is known about the mechanical architecture and chemical composition of TEP, these particles are abundant in carbon-rich acidic polysaccharides that contain some reactive groups (carboxyl and half-ester sulphate) (Passow 2002).…”

Section: Introductionmentioning

confidence: 99%

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Temporal and spatial distribution of transparent exopolymer particles off the northern coast of Baja California, Mexico

Hakspiel-Segura¹

2017

Cienc. Mar.

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Transparent exopolymer particles (TEP) have been reported as a significant fraction of organic microgels in different oceans. No TEP data have been published for the California Current region off Baja California that indicate the potential contribution of this reservoir to the carbon budget. We measured TEP in seawater samples, using the spectrophotometric method with alcian blue stain, and additional environmental and biological variables during 3 seasons at coastal stations between ~1.4 and 12.0 mi offshore, near 31ºN. Concentrations of TEP obtained with 0.45 µm pore size filters showed spatial and temporal distributions with a tendency to increase from offshore to nearshore and from winter to summer, respectively, ranging from undetectable values to 7.18 μg XG eq•mL −1 (median: 0.70). A significant positive correlation was observed between the concentration of TEP and bacterioplankton abundance (P < 0.05), and between total organic carbon and bacterioplankton abundance (P < 0.05). Transparent exopolymer particles also presented a negative correlation with community respiration (P < 0.05), suggesting that TEP provided a physical substrate for settlement of prokaryotic microorganisms but probably did not supply labile carbon. We compared the concentration of alcian blue stainable particles retained by the standard 0.45 μm pore size with the concentration obtained with 0.22 µm filters; the latter showed 1.7 to 64.0 fold (median: 4.1) higher TEP concentrations. This strong dependence of TEP concentration on pore size makes it difficult to define the quantitative contribution of TEP and their precursors to particulate organic matter and their role in the carbon cycle. Further studies on TEP in the Mexican portion of the California Current must corroborate the observed spatial and seasonal trends, and estimate a TEP-to-carbon conversion factor that provides a better approximation to its contribution to the regional carbon budget.

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