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Open Access item Ecosystem metabolism in a temporary Mediterranean marsh (Doñana National Park, SW Spain)

Authors:Geertz-Hansen, Ole
Montes, C.
Duarte, Carlos M.
Sand-Jensen, K.
Marbà, Núria
Grillas, P.
Issue Date:2011
Publisher:European Geosciences Union
Citation:Biogeosciences 8: 963- 971 (2011)
Abstract:The metabolic balance of the open waters supporting submerged macrophytes of the Doñana marsh (SW Spain) was investigated in spring, when community production is highest. The marsh community (benthic + pelagic) was net autotrophic with net community production rates averaging 0.61 g C m -2 d-1, and gross production rates exceeding community respiration rates by, on average, 43%. Net community production increased greatly with increasing irradiance, with the threshold irradiance for communities to become net autotrophic ranging from 42 to 255 μE m -2 s-1, with net heterotrophic at lower irradiance. Examination of the contributions of the benthic and the pelagic compartments showed the pelagic compartment to be strongly heterotrophic (average P/R ratio Combining double low line 0.27), indicating that the metabolism of the pelagic compartment is highly subsidised by excess organic carbon produced in the strongly autotrophic benthic compartment (average P/R Combining double low line 1.58). © 2011 Author(s).
Identifiers:doi: 10.5194/bg-8-963-2011
issn: 1726-4170
Appears in Collections:(IMEDEA) Artículos

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