Study of N and C dynamics in aquatic ecosystems Dr Natacha Brion, Dr Marc Elskens, Dr Steven Bouillon, Dr Frank Dehairs, DrS Emilie Chevalier, DrS Sandra.

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Study of N and C dynamics in aquatic ecosystems Dr Natacha Brion, Dr Marc Elskens, Dr Steven Bouillon, Dr Frank Dehairs, DrS Emilie Chevalier, DrS Sandra De Galan, DrS Perrine Mangion, Dr Willy Baeyens

Why ? Living organisms = C, N, H, O, P + trace elements Life or dead of all organisms depends on the availability and usefulness of C and N holding material. Eg: plant: CO 2 and NH 4 or NO 3 and PO 4 Eg: animal: proteins, sugars, lipids

N and C cycles NH4PN DON N2NO3 DICPOC DOC Subdivised by molecule, size, biodegradability, origin etc… Detritus Living autrotrophe Heterotrophe Species Size Etc.. INCREASING COMPLEXITY

Methodological tool I: Study the natural variations of 13 C and 15 N in various C and N pools Considered pools: –Dissolved inorganic (DIN-DIC) –Dissolved organic (DOC-DON) –Particulate organic (SPOM, living organisms) –Particulate inorganic (carbonates) Allows to highlight: –Origin of material –Major transformation pathways –Foodweb chain pathways (who eats who) Type of information: –qualitative –quantitative when combined with a modelling approach

Methodological tool II: Perform incubation experiments with enriched 15 N or 13 C tracers Tracers : dissolved inorganic or organic N and C Incubation: one tracer is added per incubation bottle or a combination of one N and one C tracer in one bottle After incubation: measure the 15 N and/or 13 C in different N and C pools –DIN – DIC pools –DON – DOC pools –PON – POC pools

Use an isotopic mass balance model to compute transformation rates Type of transformation rates that can be measured: NH4PN DON N2NO3 DICPOC DOC

Study of N and C cycle in Northern Tanganyika Lake

Relative role of macrophytes, phytoplankton and sediments in the uptake and release of inorganic nitrogen in a small river N-NH 4 kg N / day

N cycling in the Southern Bight of the North Sea Nitrate + Nitrite µM

N cycling in the Scheldt estuary

TN/day N dynamics in the Zenne river in Brussels

The fate of mangrove carbon and nitrogen in different mangrove ecosystems Studied by looking at natural variations of 15N and 13C in different compartments of the ecosystem

And… N and C cyling oin Southern Ocean N and C cycling in Pacific Ocean N and C cycling in Atlantic Ocean …. And many others