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| Titel |
Phytoplankton responses and associated carbon cycling during shipboard carbonate chemistry manipulation experiments conducted around Northwest European shelf seas |
| VerfasserIn |
S. Richier, E. P. Achterberg, C. Dumousseaud, A. J. Poulton, D. J. Suggett, T. Tyrrell, M. V. Zubkov, C. M. Moore |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 17 ; Nr. 11, no. 17 (2014-09-09), S.4733-4752 |
| Datensatznummer |
250117580
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| Publikation (Nr.) |
 copernicus.org/bg-11-4733-2014.pdf |
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| Zusammenfassung |
| The ongoing oceanic uptake of anthropogenic carbon dioxide (CO2) is
significantly altering the carbonate chemistry of seawater, a phenomenon
referred to as ocean acidification. Experimental manipulations have been
increasingly used to gauge how continued ocean acidification will potentially
impact marine ecosystems and their associated biogeochemical cycles in the
future; however, results amongst studies, particularly when performed on
natural communities, are highly variable, which may reflect
community/environment-specific responses or inconsistencies in experimental
approach. To investigate the potential for identification of more generic
responses and greater experimentally reproducibility, we devised and
implemented a series (n = 8) of short-term (2–4 days) multi-level (≥4 conditions) carbonate chemistry/nutrient manipulation experiments on a
range of natural microbial communities sampled in Northwest European shelf
seas. Carbonate chemistry manipulations and resulting biological responses
were found to be highly reproducible within individual experiments and to a
lesser extent between geographically separated experiments. Statistically
robust reproducible physiological responses of phytoplankton to increasing
pCO2, characterised by a suppression of net growth for small-sized
cells (<10 μm), were observed in the majority of the
experiments, irrespective of natural or manipulated nutrient status.
Remaining between-experiment variability was potentially linked to initial
community structure and/or other site-specific environmental factors.
Analysis of carbon cycling within the experiments revealed the expected
increased sensitivity of carbonate chemistry to biological processes at
higher pCO2 and hence lower buffer capacity. The results thus
emphasise how biogeochemical feedbacks may be altered in the future
ocean. |
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