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Enhancement of poorly edible phytoplankton by allochthonous dissolved organic material: a modelling study

Stolte, W.; Lindstrom, T. and Graneli, Edna LU (2007) In Aquatic Microbial Ecology 46(3). p.263-272
Abstract
The effect of different input rates of dissolved inorganic (DIN) and organic (DON) nitrogen on a microbial food web was studied with the help of a mathematical model. Three species of phytoplankton were modelled, with trade-off characteristics for maximum per capita growth rate, half-saturation constant and edibility. Bacteria used only DON, while 2 different types of microzooplankton grazed on the bacteria and phytoplankton species. DON stimulated bacterial growth and phytoplankton growth via mineralization of nitrogen by the bacteria. At moderate and high DIN and/or DON input rates, the poorly edible phytoplankton species became the dominant phototroph. However, the biomass of the poorly edible phytoplankton species, and the proportional... (More)
The effect of different input rates of dissolved inorganic (DIN) and organic (DON) nitrogen on a microbial food web was studied with the help of a mathematical model. Three species of phytoplankton were modelled, with trade-off characteristics for maximum per capita growth rate, half-saturation constant and edibility. Bacteria used only DON, while 2 different types of microzooplankton grazed on the bacteria and phytoplankton species. DON stimulated bacterial growth and phytoplankton growth via mineralization of nitrogen by the bacteria. At moderate and high DIN and/or DON input rates, the poorly edible phytoplankton species became the dominant phototroph. However, the biomass of the poorly edible phytoplankton species, and the proportional contribution of this species to total phytoplankton biomass, was more correlated with changes in DON input rates than DIN input rates. Furthermore, the abundance of the poorly edible phytoplankton was most sensitive to changes in the maximum grazing rate of the ciliate. The enhanced mass flow through the heterotrophic members of the food web enhanced the grazing pressure on all members of the microbial community, including phytoplankton, and caused the shift towards a grazing-resistant phytoplankton community. We formulated the testable hypothesis that input of allochthonous dissolved organic nutrients may contribute to blooms of poorly edible algae through food web interactions. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
categories
Higher Education
in
Aquatic Microbial Ecology
volume
46
issue
3
pages
263 - 272
publisher
Inter-Research
external identifiers
  • scopus:34247526433
ISSN
0948-3055
DOI
10.3354/ame046263
language
English
LU publication?
no
id
58dda064-a498-4df1-be5c-2be92bac377c (old id 7994110)
date added to LUP
2015-09-29 12:48:21
date last changed
2017-01-01 06:51:02
@article{58dda064-a498-4df1-be5c-2be92bac377c,
  abstract     = {The effect of different input rates of dissolved inorganic (DIN) and organic (DON) nitrogen on a microbial food web was studied with the help of a mathematical model. Three species of phytoplankton were modelled, with trade-off characteristics for maximum per capita growth rate, half-saturation constant and edibility. Bacteria used only DON, while 2 different types of microzooplankton grazed on the bacteria and phytoplankton species. DON stimulated bacterial growth and phytoplankton growth via mineralization of nitrogen by the bacteria. At moderate and high DIN and/or DON input rates, the poorly edible phytoplankton species became the dominant phototroph. However, the biomass of the poorly edible phytoplankton species, and the proportional contribution of this species to total phytoplankton biomass, was more correlated with changes in DON input rates than DIN input rates. Furthermore, the abundance of the poorly edible phytoplankton was most sensitive to changes in the maximum grazing rate of the ciliate. The enhanced mass flow through the heterotrophic members of the food web enhanced the grazing pressure on all members of the microbial community, including phytoplankton, and caused the shift towards a grazing-resistant phytoplankton community. We formulated the testable hypothesis that input of allochthonous dissolved organic nutrients may contribute to blooms of poorly edible algae through food web interactions.},
  author       = {Stolte, W. and Lindstrom, T. and Graneli, Edna},
  issn         = {0948-3055},
  language     = {eng},
  number       = {3},
  pages        = {263--272},
  publisher    = {Inter-Research},
  series       = {Aquatic Microbial Ecology},
  title        = {Enhancement of poorly edible phytoplankton by allochthonous dissolved organic material: a modelling study},
  url          = {http://dx.doi.org/10.3354/ame046263},
  volume       = {46},
  year         = {2007},
}