Experimentally determined temperature thresholds for Arctic plankton community metabolism.

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dc.contributor.author Holding, J.
dc.contributor.author Duarte Quesada, Carlos M.
dc.contributor.author Arrieta, J.M.
dc.contributor.author Vaquer-Sunyer, Raquel
dc.contributor.author Coello-Camba, A.
dc.contributor.author Wassmann, P.
dc.contributor.author Agustí, S.
dc.date.accessioned 2015-09-18T12:45:31Z
dc.date.available 2015-09-18T12:45:31Z
dc.date.issued 2013
dc.identifier.citation 1726-4170
dc.identifier.uri http://hdl.handle.net/11201/1258
dc.description.abstract Climate warming is especially severe in the Arctic, where the average temperature is increasing 0.4 degrees 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 degrees C to 10 degrees 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 degrees 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 degrees C beyond which Arctic plankton communities switch to heterotrophy. Barents Sea communities showed a much clearer threshold response to temperature manipulations than fjord communities.
dc.language.iso eng
dc.publisher European Geosciences Union (EGU) / Copernicus Publications
dc.relation.isformatof Reproducció del document publicat a: 10.5194/bg-10-357-2013
dc.relation.ispartof Biogeosciences, 2013, vol. 10, p. 357-370
dc.rights cc-by (c) Holding, J. et al., 2013
dc.rights.uri http://creativecommons.org/licenses/by/3.0/es
dc.title Experimentally determined temperature thresholds for Arctic plankton community metabolism.
dc.type info:eu-repo/semantics/article
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2015-09-18T12:45:31Z
dc.subject.keywords Gross primary production
dc.subject.keywords climate change
dc.subject.keywords Arctic Ocean
dc.subject.keywords threshold
dc.subject.keywords Respiration
dc.rights.accessRights info:eu-repo/semantics/openAccess

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cc-by (c) Holding, J. et al., 2013 Except where otherwise noted, this item's license is described as cc-by (c) Holding, J. et al., 2013

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