Journal article
Impact of CO2 enrichment on organic matter dynamics during nutrient induced coastal phytoplankton blooms
Journal of Plankton Research
2014
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Source: InCites
Abstract
<p><p id="x-x-p-2">A mesocosm experiment was conducted to investigate the impact of rising<em>f</em>CO<sub>2</sub> on the build-up and decline of organic matter during coastal phytoplankton blooms. Five mesocosms (∼38 m³ each) were deployed in the Baltic Sea during spring (2009) and enriched with CO<sub>2</sub> to yield a gradient of 355–862 µatm. Mesocosms were nutrient fertilized initially to induce phytoplankton bloom development. Changes in particulate and dissolved organic matter concentrations, including dissolved high-molecular weight (>1 kDa) combined carbohydrates, dissolved free and combined amino acids as well as transparent exopolymer particles (TEP), were monitored over 21 days together with bacterial abundance, and hydrolytic extracellular enzyme activities. Overall, organic matter followed well-known bloom dynamics in all CO<sub>2</sub> treatments alike. At high <em>f</em>CO<sub>2,</sub>higher ΔPOC:ΔPON during bloom rise, and higher TEP concentrations during bloom peak, suggested preferential accumulation of carbon-rich components. TEP concentration at bloom peak was significantly related to subsequent sedimentation of particulate organic matter. Bacterial abundance increased during the bloom and was highest at high <em>f</em>CO<sub>2</sub>. We conclude that increasing <em>f</em>CO<sub>2</sub> supports production and exudation of carbon-rich components, enhancing particle aggregation and settling, but also providing substrate and attachment sites for bacteria. More labile organic carbon and higher bacterial abundance can increase rates of oxygen consumption and may intensify the already high risk of oxygen depletion in coastal seas in the future.</p>
Details
- Title
- Impact of CO2 enrichment on organic matter dynamics during nutrient induced coastal phytoplankton blooms
- Creators
- Anja Engel - GEOMAR Helmholtz Centre for Ocean Research Kiel, GermanyJudith Piontek - GEOMAR Helmholtz Centre for Ocean Research Kiel, GermanyHans-Peter Grossart - Department Experimental Limnology, GermanyUlf Riebessell - GEOMAR Helmholtz Centre for Ocean Research Kiel, GermanyKai G Schulz - Southern Cross UniversityMartin Sperling - GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany
- Publication Details
- Journal of Plankton Research
- Identifiers
- 3914; 991012821958002368
- Academic Unit
- Centre for Coastal Biogeochemistry; School of Environment, Science and Engineering; Science; Faculty of Science and Engineering
- Resource Type
- Journal article