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Nitrification and denitrification in a eutrophic lake sediment bioturbated by oligochaetes

Svensson, J M; Enrich-Prast, A and Leonardson, Lars LU (2001) In Aquatic Microbial Ecology 23(2). p.177-186
Abstract
The influence on nitrification and denitrification of oligochaete Limnodrilus sp. and Tubifex tubifex bioturbation was determined in eutrophic lake sediment from the Basin of Lake Ringsjon in southern Sweden. Nitrification and denitrification activity was compared in sieved and in undisturbed sediment cores in laboratory mesocosms at 2 different concentrations of nitrate. Nitrification and total denitrification rates were positively correlated to oligochaete biomass between 0 and 4 g dry weight m(-2) at both 33 and 268 muM nitrate in the inflowing water. Denitrification (d(w)) was relatively more stimulated by the oligochaetes at high concentrations of nitrate in the overlying water than at low nitrate concentrations. Though nitrification... (More)
The influence on nitrification and denitrification of oligochaete Limnodrilus sp. and Tubifex tubifex bioturbation was determined in eutrophic lake sediment from the Basin of Lake Ringsjon in southern Sweden. Nitrification and denitrification activity was compared in sieved and in undisturbed sediment cores in laboratory mesocosms at 2 different concentrations of nitrate. Nitrification and total denitrification rates were positively correlated to oligochaete biomass between 0 and 4 g dry weight m(-2) at both 33 and 268 muM nitrate in the inflowing water. Denitrification (d(w)) was relatively more stimulated by the oligochaetes at high concentrations of nitrate in the overlying water than at low nitrate concentrations. Though nitrification was enhanced by oligochaetes, this tended to reach a maximum between 3 and 5 g of oligochaete dry weight m(-2). Comparison of the enhancement of denitrification by oligochaetes with other similar studies of denitrification in eutrophic sediment bioturbated by tube-dwelling chironomids indicates that at a similar biomass oligochaetes are less effective at mobilizing nitrate to deeper sediment layers. This is explained by the different ways oligochaetes and tube-dwelling chironomids bioturbate the sediment. Sieving and homogenising the sediment had no pronounced effect on rates of denitrification and nitrification compared to undisturbed sediment. (Less)
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organization
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Contribution to journal
publication status
published
subject
in
Aquatic Microbial Ecology
volume
23
issue
2
pages
177 - 186
publisher
Inter-Research
external identifiers
  • scopus:0035977792
ISSN
0948-3055
language
English
LU publication?
yes
id
c2197bc1-b9cf-45f8-9988-1e3e4477bc94 (old id 146683)
alternative location
http://www.int-res.com/articles/ame/23/a023p177.pdf
date added to LUP
2007-06-29 08:04:43
date last changed
2018-03-18 03:38:30
@article{c2197bc1-b9cf-45f8-9988-1e3e4477bc94,
  abstract     = {The influence on nitrification and denitrification of oligochaete Limnodrilus sp. and Tubifex tubifex bioturbation was determined in eutrophic lake sediment from the Basin of Lake Ringsjon in southern Sweden. Nitrification and denitrification activity was compared in sieved and in undisturbed sediment cores in laboratory mesocosms at 2 different concentrations of nitrate. Nitrification and total denitrification rates were positively correlated to oligochaete biomass between 0 and 4 g dry weight m(-2) at both 33 and 268 muM nitrate in the inflowing water. Denitrification (d(w)) was relatively more stimulated by the oligochaetes at high concentrations of nitrate in the overlying water than at low nitrate concentrations. Though nitrification was enhanced by oligochaetes, this tended to reach a maximum between 3 and 5 g of oligochaete dry weight m(-2). Comparison of the enhancement of denitrification by oligochaetes with other similar studies of denitrification in eutrophic sediment bioturbated by tube-dwelling chironomids indicates that at a similar biomass oligochaetes are less effective at mobilizing nitrate to deeper sediment layers. This is explained by the different ways oligochaetes and tube-dwelling chironomids bioturbate the sediment. Sieving and homogenising the sediment had no pronounced effect on rates of denitrification and nitrification compared to undisturbed sediment.},
  author       = {Svensson, J M and Enrich-Prast, A and Leonardson, Lars},
  issn         = {0948-3055},
  language     = {eng},
  number       = {2},
  pages        = {177--186},
  publisher    = {Inter-Research},
  series       = {Aquatic Microbial Ecology},
  title        = {Nitrification and denitrification in a eutrophic lake sediment bioturbated by oligochaetes},
  volume       = {23},
  year         = {2001},
}