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Photochemical reactivity of aquatic macrophyte leachates: abiotic transformations and bacterial response

Farjalla, V F; Anesio, Alexandre Magno LU ; Bertilsson, S and Granéli, Wilhelm LU (2001) In Aquatic Microbial Ecology 24(2). p.187-195
Abstract
We evaluated the influence of UV radiation exposure time on abiotic transformations of leachates from 2 aquatic macrophytes: Phragmites australis and Hydrocaris morsus-ranae. In addition, we studied the influence of phototransformations of DOM on bacterial growth. Sterile filtered leachates were exposed to UV radiation for 5, 10, 24, 48, 72 and 120 h or kept in the dark. Dissolved inorganic carbon (DIC), hydrogen peroxide and low molecular weight carboxylic acids (oxalic, formic, malonic and acetic acids) were measured. After UV or dark treatment, the leachates were inoculated with bacteria and incubated in the dark. Based on the observed DIC and hydrogen per oxide formation rates, we concluded that phototransformations are initially more... (More)
We evaluated the influence of UV radiation exposure time on abiotic transformations of leachates from 2 aquatic macrophytes: Phragmites australis and Hydrocaris morsus-ranae. In addition, we studied the influence of phototransformations of DOM on bacterial growth. Sterile filtered leachates were exposed to UV radiation for 5, 10, 24, 48, 72 and 120 h or kept in the dark. Dissolved inorganic carbon (DIC), hydrogen peroxide and low molecular weight carboxylic acids (oxalic, formic, malonic and acetic acids) were measured. After UV or dark treatment, the leachates were inoculated with bacteria and incubated in the dark. Based on the observed DIC and hydrogen per oxide formation rates, we concluded that phototransformations are initially more rapid in H. morsus-ranae DOM than in P. australis DOM. On the other hand, production of DIC after more than 48 h of UV exposure was strongly reduced for H. morsus-ranae DOM, whereas DIC production was only slightly reduced for P. australis DOM. The differences in the photoreactivity between DOM from P. australis and H. morsus-ranae DOM were also reflected in the bacterial growth response to DOM phototransformations. The lowest bacterial growth efficiencies (BGE) were found in the irradiated leachate of P, australis exposed for more than 48 h and in the irradiated leachate of H, morsus-ranae exposed for 10 h, which coincided with the highest concentrations of hydrogen peroxide for both types of leachates. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Aquatic Microbial Ecology
volume
24
issue
2
pages
187 - 195
publisher
Inter-Research
external identifiers
  • scopus:0035972954
ISSN
0948-3055
language
English
LU publication?
yes
id
8657df22-67cc-4fdb-ba7d-c7d1dfc4b39d (old id 146645)
alternative location
http://www.int-res.com/abstracts/ame/v24/n2/p187-195/
date added to LUP
2007-06-28 13:10:45
date last changed
2018-05-29 10:53:50
@article{8657df22-67cc-4fdb-ba7d-c7d1dfc4b39d,
  abstract     = {We evaluated the influence of UV radiation exposure time on abiotic transformations of leachates from 2 aquatic macrophytes: Phragmites australis and Hydrocaris morsus-ranae. In addition, we studied the influence of phototransformations of DOM on bacterial growth. Sterile filtered leachates were exposed to UV radiation for 5, 10, 24, 48, 72 and 120 h or kept in the dark. Dissolved inorganic carbon (DIC), hydrogen peroxide and low molecular weight carboxylic acids (oxalic, formic, malonic and acetic acids) were measured. After UV or dark treatment, the leachates were inoculated with bacteria and incubated in the dark. Based on the observed DIC and hydrogen per oxide formation rates, we concluded that phototransformations are initially more rapid in H. morsus-ranae DOM than in P. australis DOM. On the other hand, production of DIC after more than 48 h of UV exposure was strongly reduced for H. morsus-ranae DOM, whereas DIC production was only slightly reduced for P. australis DOM. The differences in the photoreactivity between DOM from P. australis and H. morsus-ranae DOM were also reflected in the bacterial growth response to DOM phototransformations. The lowest bacterial growth efficiencies (BGE) were found in the irradiated leachate of P, australis exposed for more than 48 h and in the irradiated leachate of H, morsus-ranae exposed for 10 h, which coincided with the highest concentrations of hydrogen peroxide for both types of leachates.},
  author       = {Farjalla, V F and Anesio, Alexandre Magno and Bertilsson, S and Granéli, Wilhelm},
  issn         = {0948-3055},
  language     = {eng},
  number       = {2},
  pages        = {187--195},
  publisher    = {Inter-Research},
  series       = {Aquatic Microbial Ecology},
  title        = {Photochemical reactivity of aquatic macrophyte leachates: abiotic transformations and bacterial response},
  volume       = {24},
  year         = {2001},
}