Advanced

ZOOPLANKTON FEEDING ECOLOGY - GRAZING DURING ENCLOSURE STUDIES OF PHYTOPLANKTON BLOOMS FROM THE WEST-COAST OF SWEDEN

Turner, J. T. and Graneli, Edna LU (1992) In Journal of Experimental Marine Biology and Ecology 157(1). p.19-31
Abstract
The effects of grazing on natural phytoplankton populations was examined during enclosure studies on the effects of nutrients, zooplankton, and ctenophores on phytoplankton bloom dynamics on the west coast of Sweden in May, 1990. Grazers included the copepods Acartia clausi Giesbrecht, Centropages hamatus Lilljeborg, and Oithona similis Claus, and the marine cladoceran Podon polyphemoides Leuckart. These species ingested various diatoms, dinoflagellates and athecate microflagellates, but grazing was minimal. Clearance rates of the copepods were < 1 ml.animal-1.h-1, while those of cladocerans reached 2.5 ml.animal-1.h-1, at microflagellate concentrations of 1442-3519 cells.ml-1. Despite the low levels of copepod and cladoceran grazing,... (More)
The effects of grazing on natural phytoplankton populations was examined during enclosure studies on the effects of nutrients, zooplankton, and ctenophores on phytoplankton bloom dynamics on the west coast of Sweden in May, 1990. Grazers included the copepods Acartia clausi Giesbrecht, Centropages hamatus Lilljeborg, and Oithona similis Claus, and the marine cladoceran Podon polyphemoides Leuckart. These species ingested various diatoms, dinoflagellates and athecate microflagellates, but grazing was minimal. Clearance rates of the copepods were < 1 ml.animal-1.h-1, while those of cladocerans reached 2.5 ml.animal-1.h-1, at microflagellate concentrations of 1442-3519 cells.ml-1. Despite the low levels of copepod and cladoceran grazing, there was considerable removal of Chl a by grazers < 90-mu-m in longest dimension. These micrograzers were present in experimental and control containers. Athecate ciliates < 20-mu-m in longest dimension were abundant (up to 1730 cells.ml-1) in some samples, and these ciliates were the most probable micrograzers. Rates of clearance of these ciliates by A. clausi (0.13-0.81 ml.animal-1.h-1) and C. hamatus (0.46-0.81 ml.animal-1.h-1) were high, even though ciliates were less abundant than most co-occurring phytoplankton taxa. Copepod and cladoceran grazing appeared to have little impact on phytoplankton dynamics. Rather, copepods were selective consumers of the ciliates that were probably the dominant grazers. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
categories
Higher Education
in
Journal of Experimental Marine Biology and Ecology
volume
157
issue
1
pages
19 - 31
publisher
Elsevier
external identifiers
  • scopus:0026565101
ISSN
0022-0981
DOI
10.1016/0022-0981(92)90071-h
language
English
LU publication?
yes
id
9b612152-fa12-4404-9183-92543bb21e4f (old id 7994174)
date added to LUP
2015-09-29 11:52:56
date last changed
2017-07-30 04:39:13
@article{9b612152-fa12-4404-9183-92543bb21e4f,
  abstract     = {The effects of grazing on natural phytoplankton populations was examined during enclosure studies on the effects of nutrients, zooplankton, and ctenophores on phytoplankton bloom dynamics on the west coast of Sweden in May, 1990. Grazers included the copepods Acartia clausi Giesbrecht, Centropages hamatus Lilljeborg, and Oithona similis Claus, and the marine cladoceran Podon polyphemoides Leuckart. These species ingested various diatoms, dinoflagellates and athecate microflagellates, but grazing was minimal. Clearance rates of the copepods were &lt; 1 ml.animal-1.h-1, while those of cladocerans reached 2.5 ml.animal-1.h-1, at microflagellate concentrations of 1442-3519 cells.ml-1. Despite the low levels of copepod and cladoceran grazing, there was considerable removal of Chl a by grazers &lt; 90-mu-m in longest dimension. These micrograzers were present in experimental and control containers. Athecate ciliates &lt; 20-mu-m in longest dimension were abundant (up to 1730 cells.ml-1) in some samples, and these ciliates were the most probable micrograzers. Rates of clearance of these ciliates by A. clausi (0.13-0.81 ml.animal-1.h-1) and C. hamatus (0.46-0.81 ml.animal-1.h-1) were high, even though ciliates were less abundant than most co-occurring phytoplankton taxa. Copepod and cladoceran grazing appeared to have little impact on phytoplankton dynamics. Rather, copepods were selective consumers of the ciliates that were probably the dominant grazers.},
  author       = {Turner, J. T. and Graneli, Edna},
  issn         = {0022-0981},
  language     = {eng},
  number       = {1},
  pages        = {19--31},
  publisher    = {Elsevier},
  series       = {Journal of Experimental Marine Biology and Ecology},
  title        = {ZOOPLANKTON FEEDING ECOLOGY - GRAZING DURING ENCLOSURE STUDIES OF PHYTOPLANKTON BLOOMS FROM THE WEST-COAST OF SWEDEN},
  url          = {http://dx.doi.org/10.1016/0022-0981(92)90071-h},
  volume       = {157},
  year         = {1992},
}