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Size-selective predation on pelagic microorganisms in Arctic freshwaters

Bertilsson, S; Hansson, Lars-Anders LU ; Granéli, Wilhelm LU and Philibert, A (2003) In Journal of Plankton Research 25(6). p.621-631
Abstract
Herbivorous zooplankton may have a pronounced influence on pelagic microorganisms in Arctic freshwaters. We quantified experimentally the size-selective feeding of several zooplankton groups on pelagic microorganisms in high Arctic tundra systems. Our experiments and field study focused on dominant herbivores in Arctic freshwaters, including the cladoceran Dophnia, the copepod Diaptomus and the anostracan Branchinecta, and their effects on prey ranging in size from bacteria to large phytoplankton. Grazing experiments showed that Dophnia were effective predators on all types of prey, whereas Diaptomus grazed preferentially on larger phytoplankton with low clearance rates for bacterial cells. Further analysis by flow cytometry indicated that... (More)
Herbivorous zooplankton may have a pronounced influence on pelagic microorganisms in Arctic freshwaters. We quantified experimentally the size-selective feeding of several zooplankton groups on pelagic microorganisms in high Arctic tundra systems. Our experiments and field study focused on dominant herbivores in Arctic freshwaters, including the cladoceran Dophnia, the copepod Diaptomus and the anostracan Branchinecta, and their effects on prey ranging in size from bacteria to large phytoplankton. Grazing experiments showed that Dophnia were effective predators on all types of prey, whereas Diaptomus grazed preferentially on larger phytoplankton with low clearance rates for bacterial cells. Further analysis by flow cytometry indicated that Diaptomus grazed selectively on the largest bacteria. In contrast to the results obtained in the controlled experiments, Arctic lakes and ponds with a zooplankton community dominated by Dophnia had a higher bacterial production and abundance than systems not dominated by this grazer. This may indicate that the stimulatory effect of grazers on bacterial growth is more pronounced in natural systems, or that factors other than zooplankton grazing are more important in regulating bacterial abundance and production in natural systems. Although Arctic waters differ considerably from temperate systems with respect to temperature and light regime, herbivore-prey dynamics as well as the bacterial response to temperature appear to be similar between the climatic regions. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Plankton Research
volume
25
issue
6
pages
621 - 631
publisher
Oxford University Press
external identifiers
  • wos:000183553300004
  • scopus:0037792053
ISSN
0142-7873
DOI
10.1093/plankt/25.6.621
language
English
LU publication?
yes
id
173512b9-d0e5-4619-a5ec-c560a4cc82cd (old id 136812)
date added to LUP
2007-06-28 12:25:56
date last changed
2018-01-07 09:38:02
@article{173512b9-d0e5-4619-a5ec-c560a4cc82cd,
  abstract     = {Herbivorous zooplankton may have a pronounced influence on pelagic microorganisms in Arctic freshwaters. We quantified experimentally the size-selective feeding of several zooplankton groups on pelagic microorganisms in high Arctic tundra systems. Our experiments and field study focused on dominant herbivores in Arctic freshwaters, including the cladoceran Dophnia, the copepod Diaptomus and the anostracan Branchinecta, and their effects on prey ranging in size from bacteria to large phytoplankton. Grazing experiments showed that Dophnia were effective predators on all types of prey, whereas Diaptomus grazed preferentially on larger phytoplankton with low clearance rates for bacterial cells. Further analysis by flow cytometry indicated that Diaptomus grazed selectively on the largest bacteria. In contrast to the results obtained in the controlled experiments, Arctic lakes and ponds with a zooplankton community dominated by Dophnia had a higher bacterial production and abundance than systems not dominated by this grazer. This may indicate that the stimulatory effect of grazers on bacterial growth is more pronounced in natural systems, or that factors other than zooplankton grazing are more important in regulating bacterial abundance and production in natural systems. Although Arctic waters differ considerably from temperate systems with respect to temperature and light regime, herbivore-prey dynamics as well as the bacterial response to temperature appear to be similar between the climatic regions.},
  author       = {Bertilsson, S and Hansson, Lars-Anders and Granéli, Wilhelm and Philibert, A},
  issn         = {0142-7873},
  language     = {eng},
  number       = {6},
  pages        = {621--631},
  publisher    = {Oxford University Press},
  series       = {Journal of Plankton Research},
  title        = {Size-selective predation on pelagic microorganisms in Arctic freshwaters},
  url          = {http://dx.doi.org/10.1093/plankt/25.6.621},
  volume       = {25},
  year         = {2003},
}