Stimulation of metazooplankton by photochemically modified dissolved organic matter

Alexandre Magno Anesio, C. Daniel, W. Graneli, E. S. Kritzberg

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18 Citations (SciVal)


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 (bacteria1proto1metazooplankton) was 47+/-5 and 37+/-5 mg carbon (C) L21 in microcosms with UVexposed and unaltered eutrophic water DOM and 15+/-4 and 11+/-2 mg C L21 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.
Original languageEnglish
Pages (from-to)101-108
Number of pages8
JournalLimnology and Oceanography
Issue number1
Publication statusPublished - 2006


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