Temperature thresholds for Arctic plankton community metabolism: an experimental assessment

J. M. Holding, C. M. Duarte, J. M. Arrieta, A. Coello, P. Wassmann, S. Agustí
2011 Biogeosciences Discussions  
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 its summer ice extent since 1980 and predictions suggest that the Arctic will be ice free in the summer as early as 2050, which 5 could increase rate of warming. Predictions based on the metabolic theory of ecology assume that temperature increase will enhance metabolic rates
more » ... 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 10 15 to heterotrophic. Barents Sea communities showed a much clearer threshold response to temperature manipulations than fjord communities. 2001), compared to the entire ice-covered Arctic interior (31 × 10 12 g C yr −1 ; Katlin and Anderson 2005). This relatively high CO 2 sinking capability is owed in part to the high 25 biological production in this area (Loeng et al., 2005). The European
doi:10.5194/bgd-8-11285-2011 fatcat:qvi5fdzmfjhudiavjbye6m67zy