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Responses to fish predation and nutrients by plankton at different levels of taxonomic resolution

Hansson, Lars-Anders LU ; Gyllström, Mikael LU ; Ståhl-Delbanco, Annika LU and Svensson, Marie LU (2004) In Freshwater Biology 49(12). p.1538-1550
Abstract
1. To improve mechanistic understanding of plankton responses to eutrophication, a mesocosm experiment was performed in the shallow littoral zone of a south Swedish lake, in which nutrient and fish gradients were crossed in a fully factorial design. 2. Food chain theory accurately predicted total biomass development of both phyto- and zooplankton. However, separating zooplankton and algae into finer taxonomic groups revealed a variety of responses to both nutrient and fish gradients. 3. That both nutrients and fish are important for phytoplankton dynamics was seen more clearly when viewing each algal group separately, than drawing conclusions only from broad system variables such as chlorophyll a concentration or total phytoplankton... (More)
1. To improve mechanistic understanding of plankton responses to eutrophication, a mesocosm experiment was performed in the shallow littoral zone of a south Swedish lake, in which nutrient and fish gradients were crossed in a fully factorial design. 2. Food chain theory accurately predicted total biomass development of both phyto- and zooplankton. However, separating zooplankton and algae into finer taxonomic groups revealed a variety of responses to both nutrient and fish gradients. 3. That both nutrients and fish are important for phytoplankton dynamics was seen more clearly when viewing each algal group separately, than drawing conclusions only from broad system variables such as chlorophyll a concentration or total phytoplankton biovolume. 4. In some taxa, physiological constraints (e.g. sensitivity to high pH and low concentrations of free CO2) and differences in competitive ability may be more important for the biomass development than fish predation, grazing by herbivorous zooplankton, and nutrient availability. 5. We conclude that food chain theory accurately predicted responses in system variables, such as total zooplankton or algal biomass, which are shaped by the dynamics of certain strong interactors ('keystone species'), such as large cladocerans, cyanobacteria and edible algae (<50 mum), whereas responses at finer taxonomic levels cannot be predicted from current theory. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Freshwater Biology
volume
49
issue
12
pages
1538 - 1550
publisher
Wiley-Blackwell
external identifiers
  • wos:000225316100003
  • scopus:9644277429
ISSN
0046-5070
DOI
10.1111/j.1365-2427.2004.01291.x
language
English
LU publication?
yes
id
3511e954-bad3-48f9-9e38-777e9b6e8eee (old id 136515)
date added to LUP
2007-06-28 13:49:00
date last changed
2017-10-01 04:46:45
@article{3511e954-bad3-48f9-9e38-777e9b6e8eee,
  abstract     = {1. To improve mechanistic understanding of plankton responses to eutrophication, a mesocosm experiment was performed in the shallow littoral zone of a south Swedish lake, in which nutrient and fish gradients were crossed in a fully factorial design. 2. Food chain theory accurately predicted total biomass development of both phyto- and zooplankton. However, separating zooplankton and algae into finer taxonomic groups revealed a variety of responses to both nutrient and fish gradients. 3. That both nutrients and fish are important for phytoplankton dynamics was seen more clearly when viewing each algal group separately, than drawing conclusions only from broad system variables such as chlorophyll a concentration or total phytoplankton biovolume. 4. In some taxa, physiological constraints (e.g. sensitivity to high pH and low concentrations of free CO2) and differences in competitive ability may be more important for the biomass development than fish predation, grazing by herbivorous zooplankton, and nutrient availability. 5. We conclude that food chain theory accurately predicted responses in system variables, such as total zooplankton or algal biomass, which are shaped by the dynamics of certain strong interactors ('keystone species'), such as large cladocerans, cyanobacteria and edible algae (&lt;50 mum), whereas responses at finer taxonomic levels cannot be predicted from current theory.},
  author       = {Hansson, Lars-Anders and Gyllström, Mikael and Ståhl-Delbanco, Annika and Svensson, Marie},
  issn         = {0046-5070},
  language     = {eng},
  number       = {12},
  pages        = {1538--1550},
  publisher    = {Wiley-Blackwell},
  series       = {Freshwater Biology},
  title        = {Responses to fish predation and nutrients by plankton at different levels of taxonomic resolution},
  url          = {http://dx.doi.org/10.1111/j.1365-2427.2004.01291.x},
  volume       = {49},
  year         = {2004},
}