TY - JOUR
T1 - Stimulation of metazooplankton by photochemically modified dissolved organic matter
AU - Anesio, Alexandre Magno
AU - Daniel, C.
AU - Graneli, W.
AU - Kritzberg, E. S.
N1 - Daniel, C., Graneli, W., Kritzberg, E. S., Anesio, A. M. (2006). Stimulation of metazooplankton by photochemically modified dissolved organic matter. Limnology and Oceanography, 51, (1), 101-108.
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
U2 - 10.4319/lo.2006.51.1.0101
DO - 10.4319/lo.2006.51.1.0101
M3 - Article
SN - 1939-5590
VL - 51
SP - 101
EP - 108
JO - Limnology and Oceanography
JF - Limnology and Oceanography
IS - 1
ER -