Use of 15N and 13C tracers to determine the effects of light, temperature, and DIN levels on the N and C uptake of freshwater macrophytes.

Nathalie Brion, Cristina Barron, Frank Dehairs

Research output: Chapter in Book/Report/Conference proceedingMeeting abstract (Book)

Abstract

In order to identify major environmental factors controlling inorganic nitrogen and carbon uptake by freshwater macrophyte species, we performed incubation experiments of macrophyte specimens in the presence of 15N-ammonium or -nitrate, and 13C-bicarbonate. Experiments where performed in specially designed whole plant incubators, which allow the isolation of the water-shoot phase from the sediment-root phase of specimens. The incubators where placed in a thermostatic cabinet with controlled light and temperature. Results showed that the 2 tested macrophyte species (Potamogeton natans and Callitriche platycarpa) had a preference for ammonium. Major factors controlling the N uptake are ammonium concentration and temperature, while major factors affecting C uptake are light and temperature. Additionally we could demonstrate that macrophytes used excess amounts of ammonium compared to biomass needs, while they were unable to satisfy their N needs with nitrate as only DIN source.
Original languageEnglish
Title of host publicationASLO Aquatic Science meeting 2009
Publication statusPublished - 2009
EventFinds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet - Stockholm, Sweden
Duration: 21 Sep 200925 Sep 2009

Conference

ConferenceFinds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet
CountrySweden
CityStockholm
Period21/09/0925/09/09

Keywords

  • macrophyte
  • river
  • freshwater
  • ammonium
  • nitrate
  • translocation

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