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Cyanobacterial chemical warfare alters zooplankton commuinty composition

Hansson, Lars-Anders LU ; Gustafsson, Susanne LU ; Rengefors, Karin LU and Bomark, Lina (2007) In Freshwater Biology 52(7). p.1290-1301
Abstract
1) Toxic algal blooms widely affect our use of water resources both with respect to drinking water and recreation. However, it is not only humans, but also organisms living in freshwater and marine ecosystems, that may be affected by algal toxins.

2) In order to assess if cyanobacterial toxins affect the composition of natural zooplankton communities, we quantified the temporal fluctuations in microcystin concentration and zooplankton community composition in six lakes.

3) Microcystin concentrations generally showed a bimodal pattern with peaks in early summer and in autumn, and total zooplankton biomass was negatively correlated with microcystin concentrations. Separating the zooplankton assemblages into finer... (More)
1) Toxic algal blooms widely affect our use of water resources both with respect to drinking water and recreation. However, it is not only humans, but also organisms living in freshwater and marine ecosystems, that may be affected by algal toxins.

2) In order to assess if cyanobacterial toxins affect the composition of natural zooplankton communities, we quantified the temporal fluctuations in microcystin concentration and zooplankton community composition in six lakes.

3) Microcystin concentrations generally showed a bimodal pattern with peaks in early summer and in autumn, and total zooplankton biomass was negatively correlated with microcystin concentrations. Separating the zooplankton assemblages into finer taxonomic groups revealed that high microcystin concentrations were negatively correlated with Daphnia and calanoid copepods, but positively correlated with small, relatively inefficient phytoplankton feeders such as cyclopoid copepods, Bosmina and rotifers.

4) In a complementary, mechanistic laboratory experiment using the natural phytoplankton communities from the six lakes, we showed that changes in in situ levels of microcystin were coupled with reduced adult size and diminished juvenile biomass in Daphnia.

5) We argue that in eutrophic lakes, large unselective herbivores, such as Daphnia, are ”sandwiched” between high fish predation and toxic food (cyanobacteria). In combination, these two mechanisms may explain why the zooplankton community in eutrophic lakes is generally comprised of small forms (e.g. rotifers and Bosmina) and selective raptorial feeders, such as cyclopoid copepods, whereas large, unselective herbivores, such as Daphnia, are rare. Hence, this cyanobacterial chemical warfare against herbivores may add to our knowledge on population and community dynamics among zooplankton in eutrophic systems. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
microcystin, cyanobacteria, Daphnia, zooplankton, toxin
in
Freshwater Biology
volume
52
issue
7
pages
1290 - 1301
publisher
Wiley-Blackwell
external identifiers
  • wos:000247127200010
  • scopus:34249881633
ISSN
0046-5070
DOI
10.1111/j.1365-2427.2007.01765.x
language
English
LU publication?
yes
id
09e4638f-a48f-43cf-918b-eb4270f027ce (old id 696824)
date added to LUP
2007-12-07 13:25:27
date last changed
2017-11-05 04:31:16
@article{09e4638f-a48f-43cf-918b-eb4270f027ce,
  abstract     = {1) Toxic algal blooms widely affect our use of water resources both with respect to drinking water and recreation. However, it is not only humans, but also organisms living in freshwater and marine ecosystems, that may be affected by algal toxins. <br/><br>
2) In order to assess if cyanobacterial toxins affect the composition of natural zooplankton communities, we quantified the temporal fluctuations in microcystin concentration and zooplankton community composition in six lakes. <br/><br>
3) Microcystin concentrations generally showed a bimodal pattern with peaks in early summer and in autumn, and total zooplankton biomass was negatively correlated with microcystin concentrations. Separating the zooplankton assemblages into finer taxonomic groups revealed that high microcystin concentrations were negatively correlated with Daphnia and calanoid copepods, but positively correlated with small, relatively inefficient phytoplankton feeders such as cyclopoid copepods, Bosmina and rotifers.<br/><br>
4) In a complementary, mechanistic laboratory experiment using the natural phytoplankton communities from the six lakes, we showed that changes in in situ levels of microcystin were coupled with reduced adult size and diminished juvenile biomass in Daphnia. <br/><br>
5) We argue that in eutrophic lakes, large unselective herbivores, such as Daphnia, are ”sandwiched” between high fish predation and toxic food (cyanobacteria). In combination, these two mechanisms may explain why the zooplankton community in eutrophic lakes is generally comprised of small forms (e.g. rotifers and Bosmina) and selective raptorial feeders, such as cyclopoid copepods, whereas large, unselective herbivores, such as Daphnia, are rare. Hence, this cyanobacterial chemical warfare against herbivores may add to our knowledge on population and community dynamics among zooplankton in eutrophic systems.},
  author       = {Hansson, Lars-Anders and Gustafsson, Susanne and Rengefors, Karin and Bomark, Lina},
  issn         = {0046-5070},
  keyword      = {microcystin,cyanobacteria,Daphnia,zooplankton,toxin},
  language     = {eng},
  number       = {7},
  pages        = {1290--1301},
  publisher    = {Wiley-Blackwell},
  series       = {Freshwater Biology},
  title        = {Cyanobacterial chemical warfare alters zooplankton commuinty composition},
  url          = {http://dx.doi.org/10.1111/j.1365-2427.2007.01765.x},
  volume       = {52},
  year         = {2007},
}