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| Titel |
Experimentally determined temperature thresholds for Arctic plankton community metabolism |
| VerfasserIn |
J. M. Holding, C. M. Duarte, J. M. Arrieta, R. Vaquer-Sunyer, A. Coello-Camba, P. Wassmann, S. Agustí  |
| 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 ; 10, no. 1 ; Nr. 10, no. 1 (2013-01-23), S.357-370 |
| Datensatznummer |
250017477
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| Publikation (Nr.) |
 copernicus.org/bg-10-357-2013.pdf |
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| Zusammenfassung |
| Climate warming is especially severe in the Arctic, where the average
temperature is increasing 0.4 °C per decade, two to three times
higher than the global average rate. Furthermore, the Arctic has lost more
than half of its summer ice extent since 1980 and predictions suggest that
the Arctic will be ice free in the summer as early as 2050, which could
increase the rate of warming. Predictions based on the metabolic theory of
ecology assume that temperature increase will enhance metabolic rates and
thus both the rate of primary production and respiration will increase.
However, these predictions do not consider the specific metabolic balance of
the communities. We tested, experimentally, the response of Arctic plankton
communities to seawater temperature spanning from 1 °C to
10 °C. Two types of communities were tested, open-ocean Arctic
communities from water collected in the Barents Sea and Atlantic influenced
fjord communities from water collected in the Svalbard fjord system.
Metabolic rates did indeed increase as suggested by metabolic theory, however
these results suggest an experimental temperature threshold of 5 °C,
beyond which the metabolism of plankton communities shifts from autotrophic
to heterotrophic. This threshold is also validated by field measurements
across a range of temperatures which suggested a temperature 5.4 °C
beyond which Arctic plankton communities switch to heterotrophy. Barents Sea
communities showed a much clearer threshold response to temperature
manipulations than fjord communities. |
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