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Stimulation of metazooplankton by photochemically modified dissolved organic matter

Author:
  • Cesar Bolivar Daniel
  • Wilhelm Granéli
  • Emma Kritzberg
  • Alexandre Magno Anesio
Publishing year: 2006
Language: English
Pages: 101-108
Publication/Series: Limnology and Oceanography
Volume: 51
Issue: 1
Document type: Journal article
Publisher: ASLO

Abstract english

We examined the response of bacteria and proto- and metazooplankton to photomodified dissolved organic matter (DOM). Sterile filtered water from a eutrophic and a humic lake, that was either exposed to artificial ultraviolet (UV) radiation or kept dark, was added to semicontinuous laboratory microcosms that lasted for 7 weeks. Bacterial production responded positively to photochemical modification of DOM regardless of lake type. Final heterotrophic biomass (bacteria + proto + metazooplankton) was 47 +/- 5 and 37 +/- 5 mu g carbon (C) L-1 in microcosms with UV-exposed and unaltered eutrophic water DOM and 15 +/- 4 and 11 +/- 2 mu g C L-1 in microcosms with UV-exposed and unaltered humic water DOM, respectively. For the eutrophic water, there were no significant differences in proto- or metazooplankton biomasses between microcosms receiving UV-exposed or nonexposed DOM. Differences between eutrophic water microcosms were not significant when flagellates, ciliates, cladocerans, and copepods were examined separately. In microcosms with UV-exposed humic water, biomasses of heterotrophic flagellates, rotifers, nauplii, and cladocerans were higher than in those with nonexposed DOM. Higher final metazooplankton biomass following addition of UV-exposed humic water indicates that photochemically modified DOM can be effectively transferred through the microbial loop.

Keywords

  • Ecology

Other

Published
  • ISSN: 1939-5590
Wilhelm Granéli
E-mail: wilhelm [dot] graneli [at] biol [dot] lu [dot] se

Professor emeritus

Aquatic ecology

+46 70 279 82 34

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