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| Titel |
Long-term effects of elevated pCO2 and temperature on microbial abundance and respiration in mesopelagic waters of the NW Mediterranean Sea |
| VerfasserIn |
Markus Weinbauer, Jinwen Liu, Chiaki Motegi, Karine Nedoncelle, Cornelia Maier, Marie Luiza Pedrotti, Minhan Dai, Jean-Pierre Gattuso |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055440
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| Zusammenfassung |
| Mesopelagic communities are subject to higher pCO2 levels than surface ones. Some studies have been performed on the combined effects of elevated pCO2 and temperature on surface pelagic communities but nothing is known in the mesopelagic zone. We investigated the effects of elevated pCO2 and temperature on microbial abundance and respiration community composition and related variables in long-term (2 months) experiments with mesopelagic waters (300 m depth) collected off the Bay of Villefranche, NW Mediterranean. Two experiments were conducted with two temperatures (13 and 16ºC) and two pCO2 levels (ambient pCO2, 400 µatm; elevated pCO2, 1000 µatm). The abundance of viruses, prokaryotes and flagellates were measured together with the concentration of transparent exopolymeric particle (TEP) and microbial respiration. Abundances and TEP concentrations (as far analysed) were not or only slightly affected by the treatments. Microbial respiration increased with temperature and decreased -in one experiment- with elevated pCO2. The fact that no clear cause-effect relationship could be detected for all treatments could be due to the different communities present at the start of the experiments (see companion abstract by Motegi et al.). Overall, we temperature and pCO2 changes could affect microbial respiration and that temperature changes had a stronger and more consistent effect. |
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