Potential effects of ocean acidification on microbial organic matter degradation during an offshore mesocosm experiment
Microbiological processes play a major role in biogeochemical cycling of organic matter in the ocean. However, little is known about the direct effects of ocean acidification on heterotrophic activity and, hence organic matter cycling through the microbial loop. To elucidate whether future ocean aci...
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ftoceanrep:oai:oceanrep.geomar.de:12344 2023-05-15T17:49:47+02:00 Potential effects of ocean acidification on microbial organic matter degradation during an offshore mesocosm experiment Lunau, M. Wurst, M. Piontek, J. Grossart, H. P. Riebesell, Ulf Engel, Anja 2008 https://oceanrep.geomar.de/id/eprint/12344/ unknown Lunau, M., Wurst, M., Piontek, J., Grossart, H. P., Riebesell, U. and Engel, A. (2008) Potential effects of ocean acidification on microbial organic matter degradation during an offshore mesocosm experiment. [Poster] In: ASLO Ocean Sciences Meeting. , 02.-07.03.2008, Orlando, USA . Conference or Workshop Item NonPeerReviewed 2008 ftoceanrep 2023-04-07T15:00:40Z Microbiological processes play a major role in biogeochemical cycling of organic matter in the ocean. However, little is known about the direct effects of ocean acidification on heterotrophic activity and, hence organic matter cycling through the microbial loop. To elucidate whether future ocean acidification will directly effect microbial organic matter degradation, a study was conducted examining the impact of decreasing pH on bacterial hydrolytic enzyme activities. Different acid treatments were used to induce different pCO2 environments in offshore mesocosms during a series of short time experiments. The study was carried out in the Baltic Sea in July 2007 in the frame of the SOPRAN (Surface Ocean PRocesses in the ANthropocene) project. Based on kinetic measurements, maximum turn-over rates (Vmax) and half-saturation constant (Km) were calculated for glucosidases, peptidases and phosphatase. A decrease in pH led to a significant increase in carbohydrate maximum turn-over rates accompanied by a decrease of peptide degradation. Possible implications of this short time changes in heterotrophic organic matter turnover due to acidification will be discussed. Conference Object Ocean acidification OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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Microbiological processes play a major role in biogeochemical cycling of organic matter in the ocean. However, little is known about the direct effects of ocean acidification on heterotrophic activity and, hence organic matter cycling through the microbial loop. To elucidate whether future ocean acidification will directly effect microbial organic matter degradation, a study was conducted examining the impact of decreasing pH on bacterial hydrolytic enzyme activities. Different acid treatments were used to induce different pCO2 environments in offshore mesocosms during a series of short time experiments. The study was carried out in the Baltic Sea in July 2007 in the frame of the SOPRAN (Surface Ocean PRocesses in the ANthropocene) project. Based on kinetic measurements, maximum turn-over rates (Vmax) and half-saturation constant (Km) were calculated for glucosidases, peptidases and phosphatase. A decrease in pH led to a significant increase in carbohydrate maximum turn-over rates accompanied by a decrease of peptide degradation. Possible implications of this short time changes in heterotrophic organic matter turnover due to acidification will be discussed. |
format |
Conference Object |
author |
Lunau, M. Wurst, M. Piontek, J. Grossart, H. P. Riebesell, Ulf Engel, Anja |
spellingShingle |
Lunau, M. Wurst, M. Piontek, J. Grossart, H. P. Riebesell, Ulf Engel, Anja Potential effects of ocean acidification on microbial organic matter degradation during an offshore mesocosm experiment |
author_facet |
Lunau, M. Wurst, M. Piontek, J. Grossart, H. P. Riebesell, Ulf Engel, Anja |
author_sort |
Lunau, M. |
title |
Potential effects of ocean acidification on microbial organic matter degradation during an offshore mesocosm experiment |
title_short |
Potential effects of ocean acidification on microbial organic matter degradation during an offshore mesocosm experiment |
title_full |
Potential effects of ocean acidification on microbial organic matter degradation during an offshore mesocosm experiment |
title_fullStr |
Potential effects of ocean acidification on microbial organic matter degradation during an offshore mesocosm experiment |
title_full_unstemmed |
Potential effects of ocean acidification on microbial organic matter degradation during an offshore mesocosm experiment |
title_sort |
potential effects of ocean acidification on microbial organic matter degradation during an offshore mesocosm experiment |
publishDate |
2008 |
url |
https://oceanrep.geomar.de/id/eprint/12344/ |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
Lunau, M., Wurst, M., Piontek, J., Grossart, H. P., Riebesell, U. and Engel, A. (2008) Potential effects of ocean acidification on microbial organic matter degradation during an offshore mesocosm experiment. [Poster] In: ASLO Ocean Sciences Meeting. , 02.-07.03.2008, Orlando, USA . |
_version_ |
1766156236698419200 |