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Stimulation of metazooplankton by photochemically modified dissolved organic matter

Daniel, Cesar Bolivar LU ; Granéli, Wilhelm LU ; Kritzberg, Emma LU and Anesio, Alexandre Magno LU (2006) In Limnology and Oceanography 51(1). p.101-108
Abstract
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,... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Limnology and Oceanography
volume
51
issue
1
pages
101 - 108
publisher
ASLO
external identifiers
  • wos:000237399700011
  • scopus:32944465694
ISSN
1939-5590
language
English
LU publication?
yes
id
2d9678f2-9f90-4be5-98a6-64a648e2648c (old id 159567)
alternative location
http://www.aslo.org/lo/pdf/vol_51/issue_1/0101.pdf
date added to LUP
2007-06-28 13:02:21
date last changed
2019-10-13 04:17:11
@article{2d9678f2-9f90-4be5-98a6-64a648e2648c,
  abstract     = {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.},
  author       = {Daniel, Cesar Bolivar and Granéli, Wilhelm and Kritzberg, Emma and Anesio, Alexandre Magno},
  issn         = {1939-5590},
  language     = {eng},
  number       = {1},
  pages        = {101--108},
  publisher    = {ASLO},
  series       = {Limnology and Oceanography},
  title        = {Stimulation of metazooplankton by photochemically modified dissolved organic matter},
  volume       = {51},
  year         = {2006},
}