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Open Access item Ecosystem metabolism in a temporary Mediterranean marsh (Doñana National Park, SW Spain)
Duarte, Carlos M.
|Publisher:||European Geosciences Union (EGU),|
|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).|
|Appears in Collections:||(IMEDEA) Artículos|
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