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The importance of morphological versus chemical defences for the bloom-forming cyanobacterium Microcystis against amoebae grazing

Jeroen Van Wichelen UGent, Ineke van Gremberghe UGent, Pieter Vanormelingen UGent and Wim Vyverman UGent (2012) AQUATIC ECOLOGY. 46(1). p.73-84
abstract
Amoebae grazing can be an important loss factor for blooms of the common cyanobacterium Microcystis. Some Microcystis strains seem to be protected against amoebae grazing, but it is unclear whether this is achieved by their colony morphology or biochemically. These factors were investigated in grazing experiments using two Microcystis-grazing amoebae (Korotnevella sp. and Vannella sp.) and two Microcystis strains with differing colony morphology (aeruginosa and viridis morphotype) and different sensitivity to amoebae grazing. Amoebae did not increase in density and failed to reduce the growth rate of cultures of the amoebae insensitive viridis strain, irrespective of whether the Microcystis strain was colonial or unicellular. This suggests that the extended mucilage matrix surrounding viridis colonies is not the main defence mechanism against amoebae grazing. At the same time, the growth rate of both unicellular and colonial cultures of the amoebae-sensitive aeruginosa strain was heavily reduced by the growing amoebae. The addition of filtered viridis-conditioned medium to aeruginosa cultures significantly decreased both amoebae growth and its effect on aeruginosa growth rates, which indicates that extracellular compounds constitutively produced by viridis are at least partially responsible for their insensitivity to amoebae grazing. These results demonstrate the potential importance of chemical interactions between lower trophic levels (protists) for Microcystis bloom dynamics.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
Biochemicals, Colony morphology, Cyanobacteria, Grazing, Amoebae, Microcystis, COLONY FORMATION, HYPERTROPHIC POND, HERBIVORE DAPHNIA, NAKED AMEBAS, GREEN-ALGA, AERUGINOSA, ZOOPLANKTON, GROWTH, WATER, MUCILAGE
journal title
AQUATIC ECOLOGY
Aquat. Ecol.
volume
46
issue
1
pages
73 - 84
Web of Science type
Article
Web of Science id
000299842700006
JCR category
MARINE & FRESHWATER BIOLOGY
JCR impact factor
1.378 (2012)
JCR rank
51/99 (2012)
JCR quartile
3 (2012)
ISSN
1386-2588
DOI
10.1007/s10452-011-9382-8
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2140580
handle
http://hdl.handle.net/1854/LU-2140580
date created
2012-06-12 13:41:13
date last changed
2012-06-27 14:22:12
@article{2140580,
  abstract     = {Amoebae grazing can be an important loss factor for blooms of the common cyanobacterium Microcystis. Some Microcystis strains seem to be protected against amoebae grazing, but it is unclear whether this is achieved by their colony morphology or biochemically. These factors were investigated in grazing experiments using two Microcystis-grazing amoebae (Korotnevella sp. and Vannella sp.) and two Microcystis strains with differing colony morphology (aeruginosa and viridis morphotype) and different sensitivity to amoebae grazing. Amoebae did not increase in density and failed to reduce the growth rate of cultures of the amoebae insensitive viridis strain, irrespective of whether the Microcystis strain was colonial or unicellular. This suggests that the extended mucilage matrix surrounding viridis colonies is not the main defence mechanism against amoebae grazing. At the same time, the growth rate of both unicellular and colonial cultures of the amoebae-sensitive aeruginosa strain was heavily reduced by the growing amoebae. The addition of filtered viridis-conditioned medium to aeruginosa cultures significantly decreased both amoebae growth and its effect on aeruginosa growth rates, which indicates that extracellular compounds constitutively produced by viridis are at least partially responsible for their insensitivity to amoebae grazing. These results demonstrate the potential importance of chemical interactions between lower trophic levels (protists) for Microcystis bloom dynamics.},
  author       = {Van Wichelen, Jeroen and van Gremberghe, Ineke and Vanormelingen, Pieter and Vyverman, Wim},
  issn         = {1386-2588},
  journal      = {AQUATIC ECOLOGY},
  keyword      = {Biochemicals,Colony morphology,Cyanobacteria,Grazing,Amoebae,Microcystis,COLONY FORMATION,HYPERTROPHIC POND,HERBIVORE DAPHNIA,NAKED AMEBAS,GREEN-ALGA,AERUGINOSA,ZOOPLANKTON,GROWTH,WATER,MUCILAGE},
  language     = {eng},
  number       = {1},
  pages        = {73--84},
  title        = {The importance of morphological versus chemical defences for the bloom-forming cyanobacterium Microcystis against amoebae grazing},
  url          = {http://dx.doi.org/10.1007/s10452-011-9382-8},
  volume       = {46},
  year         = {2012},
}

Chicago
Van Wichelen, Jeroen, Ineke van Gremberghe, Pieter Vanormelingen, and Wim Vyverman. 2012. “The Importance of Morphological Versus Chemical Defences for the Bloom-forming Cyanobacterium Microcystis Against Amoebae Grazing.” Aquatic Ecology 46 (1): 73–84.
APA
Van Wichelen, J., van Gremberghe, I., Vanormelingen, P., & Vyverman, W. (2012). The importance of morphological versus chemical defences for the bloom-forming cyanobacterium Microcystis against amoebae grazing. AQUATIC ECOLOGY, 46(1), 73–84.
Vancouver
1.
Van Wichelen J, van Gremberghe I, Vanormelingen P, Vyverman W. The importance of morphological versus chemical defences for the bloom-forming cyanobacterium Microcystis against amoebae grazing. AQUATIC ECOLOGY. 2012;46(1):73–84.
MLA
Van Wichelen, Jeroen, Ineke van Gremberghe, Pieter Vanormelingen, et al. “The Importance of Morphological Versus Chemical Defences for the Bloom-forming Cyanobacterium Microcystis Against Amoebae Grazing.” AQUATIC ECOLOGY 46.1 (2012): 73–84. Print.