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Strong effects of amoebae grazing on the biomass and genetic structure of a Microcystis bloom (Cyanobacteria)

(2010) ENVIRONMENTAL MICROBIOLOGY. 12(10). p.2797-2813
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Abstract
Despite its importance for bloom toxicity, the factors determining the population structure of cyanobacterial blooms are poorly understood. Here, we report the results of a two-year field survey of the population dynamics of Microcystis blooms in a small hypertrophic urban pond. Microscopic enumeration of Microcystis and its predators and parasites was combined with pigment and microcystin analysis and denaturing gradient gel electrophoresis of the ITS rDNA region to assess population dynamics and structure. Two main Microcystis morpho- and ITS types were revealed, corresponding to M. aeruginosa and M. viridis. In both years, high population densities of naked amoebae grazing on Microcystis coincided with rapid decreases in Microcystis biomass. In one year, there was a shift from heavily infested M. aeruginosa to the less-infested M. viridis, allowing the bloom to rapidly recover. The preference of amoebae for M. aeruginosa was confirmed by grazing experiments, in which several amoeba strains were capable of grazing down a strain of M. aeruginosa, but not of M. viridis. Zooplankton and chytrid parasites appeared to be of minor importance for these strong and fast reductions in Microcystis biomass. These findings demonstrate a strong impact of small protozoan grazers on the biomass and genetic structure of Microcystis blooms.
Keywords
HARMFUL ALGAL BLOOMS, FRESH-WATER POND, PLANKTONIC NAKED AMEBAS, GRADIENT GEL-ELECTROPHORESIS, HYPERTROPHIC POND, BIOLOGICAL-CONTROL, GREEN-ALGA, AERUGINOSA CYANOBACTERIA, RIBOSOMAL-RNA, ANNUAL CYCLE

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Chicago
Van Wichelen, Jeroen, Ineke van Gremberghe, Pieter Vanormelingen, Ann-Eline Debeer, Bruno Leporcq, Diana Menzel, Geoffrey A Codd, Jean-Pierre Descy, and Wim Vyverman. 2010. “Strong Effects of Amoebae Grazing on the Biomass and Genetic Structure of a Microcystis Bloom (Cyanobacteria).” Environmental Microbiology 12 (10): 2797–2813.
APA
Van Wichelen, J., van Gremberghe, I., Vanormelingen, P., Debeer, A.-E., Leporcq, B., Menzel, D., Codd, G. A., et al. (2010). Strong effects of amoebae grazing on the biomass and genetic structure of a Microcystis bloom (Cyanobacteria). ENVIRONMENTAL MICROBIOLOGY, 12(10), 2797–2813.
Vancouver
1.
Van Wichelen J, van Gremberghe I, Vanormelingen P, Debeer A-E, Leporcq B, Menzel D, et al. Strong effects of amoebae grazing on the biomass and genetic structure of a Microcystis bloom (Cyanobacteria). ENVIRONMENTAL MICROBIOLOGY. 2010;12(10):2797–813.
MLA
Van Wichelen, Jeroen, Ineke van Gremberghe, Pieter Vanormelingen, et al. “Strong Effects of Amoebae Grazing on the Biomass and Genetic Structure of a Microcystis Bloom (Cyanobacteria).” ENVIRONMENTAL MICROBIOLOGY 12.10 (2010): 2797–2813. Print.
@article{1245741,
  abstract     = {Despite its importance for bloom toxicity, the factors determining the population structure of cyanobacterial blooms are poorly understood. Here, we report the results of a two-year field survey of the population dynamics of Microcystis blooms in a small hypertrophic urban pond. Microscopic enumeration of Microcystis and its predators and parasites was combined with pigment and microcystin analysis and denaturing gradient gel electrophoresis of the ITS rDNA region to assess population dynamics and structure. Two main Microcystis morpho- and ITS types were revealed, corresponding to M. aeruginosa and M. viridis. In both years, high population densities of naked amoebae grazing on Microcystis coincided with rapid decreases in Microcystis biomass. In one year, there was a shift from heavily infested M. aeruginosa to the less-infested M. viridis, allowing the bloom to rapidly recover. The preference of amoebae for M. aeruginosa was confirmed by grazing experiments, in which several amoeba strains were capable of grazing down a strain of M. aeruginosa, but not of M. viridis. Zooplankton and chytrid parasites appeared to be of minor importance for these strong and fast reductions in Microcystis biomass. These findings demonstrate a strong impact of small protozoan grazers on the biomass and genetic structure of Microcystis blooms.},
  author       = {Van Wichelen, Jeroen and van Gremberghe, Ineke and Vanormelingen, Pieter and Debeer, Ann-Eline and Leporcq, Bruno and Menzel, Diana and Codd, Geoffrey A and Descy, Jean-Pierre and Vyverman, Wim},
  issn         = {1462-2912},
  journal      = {ENVIRONMENTAL MICROBIOLOGY},
  keywords     = {HARMFUL ALGAL BLOOMS,FRESH-WATER POND,PLANKTONIC NAKED AMEBAS,GRADIENT GEL-ELECTROPHORESIS,HYPERTROPHIC POND,BIOLOGICAL-CONTROL,GREEN-ALGA,AERUGINOSA CYANOBACTERIA,RIBOSOMAL-RNA,ANNUAL CYCLE},
  language     = {eng},
  number       = {10},
  pages        = {2797--2813},
  title        = {Strong effects of amoebae grazing on the biomass and genetic structure of a Microcystis bloom (Cyanobacteria)},
  url          = {http://dx.doi.org/10.1111/j.1462-2920.2010.02249.x},
  volume       = {12},
  year         = {2010},
}

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