Ecosystem metabolism in a temporary Mediterranean marsh (Donana National Park, SW Spain)
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metabolic balance of the open waters supporting submerged macrophytes of the Donana 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 mu E 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 = 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 = 1.58)
Originalsprog | Engelsk |
---|---|
Tidsskrift | Biogeosciences |
Vol/bind | 8 |
Udgave nummer | 4 |
Sider (fra-til) | 963-971 |
Antal sider | 9 |
ISSN | 1726-4170 |
DOI | |
Status | Udgivet - 2011 |
- AQUATIC ECOSYSTEMS, SALT-MARSH, MACROPHYTES, GROWTH, PHYTOPLANKTON, PRODUCTIVITY, ESTUARY, CARBON
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