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Bacterial growth on photochemically transformed leachates from aquatic and terrestrial primary producers

Författare:
  • Alexandre Magno Anesio
  • J Theil-Nielsen
  • Wilhelm Granéli
Publiceringsår: 2000
Språk: Engelska
Sidor: 200-208
Publikation/Tidskrift/Serie: Microbial Ecology
Volym: 40
Nummer: 3
Dokumenttyp: Artikel i tidskrift
Förlag: Springer

Abstract english

We measured bacterial growth on phototransformed dissolved organic matter (DOM) leached from eight different primary producers. Leachates (10 mg C liter(-1)) were exposed to artificial UVA + UVB radiation, or kept in darkness, for 20 h. DOM solutions were subsequently inoculated with lake water bacteria. Photoproduction of dissolved inorganic carbon (DIC), ranging from 3 to 16 mug C liter(-1) h(-1), and changes in the absorptive characteristics of the DOM were observed for all leachates upon UV irradiation. The effects of irradiation exposure on DOM bioavailability varied greatly, depending on leachate and type of bacterial growth criterion. Bacterial carbon utilization (biomass production plus respiration) over the entire incubation period (120 h) was enhanced by UV radiation of leachate from the terrestrial leaves, relative to carbon utilization in non-irradiated leachates. Conversely, carbon utilization was reduced by radiation of the leachates from aquatic macrophytes. In a separate experiment, the stable C and N isotope composition of bacteria grown on irradiated and non-irradiated DOM was estimated. Bacterial growth on UV-irradiated DOM was enriched in C-13 relative to the bacteria in the non-irradiated treatments; this result may be explained by selective assimilation of photochemically produced, isotopically enriched labile compounds.

Keywords

  • Ecology

Other

Published
  • ISSN: 1432-184X
Wilhelm Granéli
E-post: wilhelm [dot] graneli [at] biol [dot] lu [dot] se

Professor emeritus

Akvatisk ekologi

+46 70 279 82 34

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Forskargrupp

Akvatisk ekologi