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Emiliania huxleyi (strain B 92/11) was exposed to different nutrient supply, CO2 and temperature conditions in phosphorus controlled chemostats to investigate effects on organic carbon exudation and partitioning between the pools of particulate organic carbon (POC) and dissolved organic carbon (DOC). 14C incubation measurements for primary production (PP) and extracellular release (ER) were performed. Chemical analysis included the amount and composition of high molecular weight (>1 kDa) dissolved combined carbohydrates (HMW-dCCHO), particulate combined carbohydrates (pCCHO) and the carbon content of transparent exopolymer particles (TEP-C). Applied CO2 and temperature conditions were 300, 550 and 900 µatm pCO2 at 14 °C, and additionally 900 µatm pCO2 at 18 °C simulating a greenhouse ocean scenario. Enhanced nutrient stress by reducing the dilution rate (D) from D = 0.3 /d to D = 0.1 /d (D = µ) induced the strongest response in E. huxleyi. At µ = 0.3 /d, PP was significantly higher at elevated CO2 and temperature and DO14C production correlated to PO14C production in all treatments, resulting in similar percentages of extracellular release (PER; (DO14C production/PP) × 100) averaging 3.74 ± 0.94%. At µ = 0.1 /d, PO14C production decreased significantly, while exudation of DO14C increased. Thus, indicating a stronger partitioning from the particulate to the dissolved pool. Maximum PER of 16.3 ± 2.3% were observed at µ = 0.1 /d at elevated CO2 and temperature. While cell densities remained constant within each treatment and throughout the experiment, concentrations of HMW-dCCHO, pCCHO and TEP were generally higher under enhanced nutrient stress. At µ= 0.3 /d, pCCHO concentration increased significantly with elevated CO2 and temperature. At µ = 0.1 /d, the contribution (mol % C) of HMW-dCCHO to DOC was lower at elevated CO2 and temperature while pCCHO and TEP concentrations were higher. This was most pronounced under greenhouse conditions. Our findings suggest a stronger transformation of primary produced DOC into POC by coagulation of exudates under nutrient limitation. Our results further imply that elevated CO2 and temperature will increase exudation by E. huxleyi and may affect organic carbon partitioning in the ocean due to an enhanced transfer of HMW-dCCHO to TEP by aggregation processes.

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PANGAEA - Publishing Network for Geoscientific & Environmental Data  


Borchard, Corinna -  Engel, Anja - 

Id.: 58272146

Idioma: inglés  - 

Versión: 1.0

Estado: Final

Tipo:  text/tab-separated-values, 1269 data points - 

Palabras claveAlkalinity, total -  Arabinose/galactosamine -  Aragonite saturation state -  Bicarbonate ion -  BIOACID -  Biological Impacts of Ocean Acidification -  Bottles or small containers/Aquaria ( 20 L) -  Calcite saturation state -  Calculated using seacarb after Nisumaa et al. (2010) -  Carbohydrates, dissolved hydrolyzable -  Carbohydrates, particulate hydrolyzable -  Carbohydrates, total combined -  Carbon, inorganic, dissolved -  Carbon, organic, dissolved -  Carbonate ion -  Carbonate system computation flag -  Carbon dioxide -  Chromista -  EPOCA -  European Project on Ocean Acidification -  Extracellular release -  Exudation as determined by 14C DOC production -  Fucose -  Fugacity of carbon dioxide (water) at sea surface temperature (wet air) -  Galactose -  Galacturonic acid -  Glucosamine -  Glucose -  Glucuronic acid -  Growth/Morphology -  Growth rate -  Haptophyta -  Laboratory experiment -  Laboratory strains -  Mannose/xylose -  OA -  ICC -  Ocean Acidification International Coordination Centre -  Other metabolic rates -  Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) -  Pelagos -  pH -  Phytoplankton -  Primary production/Photosynthesis -  Primary production of carbon per day -  Primary production of POC as determined by 14C POC production -  Replicate -  Revelle factor -  Rhamnose -  Salinity -  Single species -  Species -  Temperature -  Temperature, water -  Transparent exopolymer particles -  Transparent exopolymer particles/particulate organic carbon ratio -  Treatment - 

Tipo de recurso: Dataset  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: CC-BY: Creative Commons Attribution 3.0 Unported

Formatos:  text/tab-separated-values, 1269 data points - 

Requerimientos técnicos:  Browser: Any - 

Relación: [IsBasedOn] Supplement to: Borchard, Corinna; Engel, Anja (2012): Organic matter exudation by Emiliania huxleyi under simulated future ocean conditions. Biogeosciences, 9(8), 3405-3423, https://doi.org/10.5194/bg-9-3405-2012
[References] Lavigne, Héloise; Gattuso, Jean-Pierre (2011): seacarb: seawater carbonate chemistry with R. R package version 2.4. https://cran.r-project.org/package=seacarb

Fecha de contribución: 17-feb-2018



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