Effects of rising temperature and pCO2 on bacterial degradation processes in marine systems.

Piontek, J., Händel, N. and Engel, Anja (2007) Effects of rising temperature and pCO2 on bacterial degradation processes in marine systems. [Talk] In: EGU General Assembly 2007. , 15.-20.04.2007, Vienna, Austria .

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Abstract

The amount of CO2 being stored in the ocean is mainly controlled by the balance between primary production, calcification and microbial decomposition of organic matter. Recent studies demonstrated effects of rising temperature and pCO2 on phytoplankton cells and related changes in the biogeochemistry of particulate matter. However, little is known about the potential influence of climate change on microbial activities and degradation processes.We tested the effects of increasing temperature and decreasing pH on the degradation of organic matter in a series of chemostat- and batchexperiments with natural phytoplankton communities (dominated by diatoms or coccolithophores) as degradable organic matter. First results showed that rising temperature as well as seawater acidification affected bacteria abundance and growth rates, and also the potential degradation of organic matter as derived from changes in the activities of polysaccharide- and protein-degrading exoenzymes (e.g. beta-glucosidase, leucine-aminopeptidase). Variations in the microbial degradation activity during our experiments were related to changes in the biogeochemistry of dissolved and particulate
organic matter. These findings show the necessity to include the response of marine bacteria to climate changes when estimating the future carbon cycle.

Document Type: Conference or Workshop Item (Talk)
Keywords: Marine Biology; bacteria; marine systems
Date Deposited: 10 Oct 2011 11:17
Last Modified: 09 Aug 2019 11:45
URI: https://oceanrep.geomar.de/id/eprint/12308

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