Ultraviolet radiation induces reversal of the bioavailability of DOM to marine bacterioplankton

Gregor Obernosterer, R Sempere, G J Herndl

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Abstract

: The effect of solar radiation on the bioavailability of dissolved organic matter (DOM) was investigated during a cruise in the Southern Ocean (similar to 44.5 degreesS, 63 degreesE) in January and February 1999. Seawater was collected in the chlorophyll maximum layer (CML, 30 to 80 m depth) and in deep waters (DW, 200 to 5000 m depth), filtered through 0.2 pm pore-size filters, and exposed to surface solar irradiation for 8 h. The bisavailability of the irradiated DOM and of that in the corresponding dark treatment was subsequently tested in bioassay experiments performed in the dark. Seawater from the CML was also size-fractionated and the effect of solar radiation on the bioavailability of the 2-fold higher in the

Original languageEnglish
Pages (from-to)61-68
Number of pages8
JournalAquatic Microbial Ecology
Volume24
Issue number1
DOIs
Publication statusPublished - 28-Mar-2001
Externally publishedYes

Keywords

  • dissolved organic matter
  • ultraviolet radiation
  • DOM-photoreactivity
  • bacterioplankton
  • Southern Ocean
  • DISSOLVED ORGANIC-MATTER
  • HUMIC SUBSTANCES
  • NATURAL-WATERS
  • CARBONYL-COMPOUNDS
  • BACTERIAL-GROWTH
  • CARBOXYLIC-ACIDS
  • INORGANIC CARBON
  • SEA-WATER
  • SEAWATER
  • OCEAN

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