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Predation impact of ciliated and flagellated protozoa during a summer bloom of brown sulfur bacteria in a meromictic coastal lake.(Report)

Sacca, Alessandro ; Borrego, Carles M. ; Renda, Rossella ; Triado - Margarit, Xavier ; Bruni, Vivia ; Guglielmo, Letterio

FEMS Microbiology Ecology, Oct, 2009, Vol.70(1), p.42(12) [Periódico revisado por pares]

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  • Título:
    Predation impact of ciliated and flagellated protozoa during a summer bloom of brown sulfur bacteria in a meromictic coastal lake.(Report)
  • Autor: Sacca, Alessandro ; Borrego, Carles M. ; Renda, Rossella ; Triado - Margarit, Xavier ; Bruni, Vivia ; Guglielmo, Letterio
  • Assuntos: Sulfur -- Physiological Aspects ; Sulfur Compounds -- Physiological Aspects ; Fluorescence -- Physiological Aspects ; Photosynthesis -- Physiological Aspects ; Chlorophyll -- Physiological Aspects ; Ecology -- Physiological Aspects
  • É parte de: FEMS Microbiology Ecology, Oct, 2009, Vol.70(1), p.42(12)
  • Descrição: To authenticate to the full-text of this article, please visit this link: http://dx.doi.org/10.1111/j.1574-6941.2009.00735.x Byline: Alessandro Sacca (1), Carles M. Borrego (2), Rossella Renda (3), Xavier Triado-Margarit (2), Vivia Bruni (1), Letterio Guglielmo (1) Keywords: grazing; planktonic protozoa; meromictic lake; anoxic environment; sulfur bacteria; bacteriochlorophyll Abstract: Abstract Anaerobic phagotrophic protozoa may play an important role in the carbon flux of chemically stratified environments, especially when phototrophic sulfur bacteria account for a high proportion of the primary production. To test this assumption, we investigated the vertical and temporal distribution of microbial heterotrophs and of autotrophic picoplankton throughout the water column of the meromictic coastal lake Faro (Sicily, Italy), in the summer of 2004, coinciding with a bloom of brown-colored green sulfur bacteria. We also assessed the grazing impact of ciliated and flagellated protozoa within the sulfur bacteria plate using a modification of the fluorescently labeled bacteria uptake approach, attempting to minimize the biases intrinsic to the technique and to preserve the in situ anoxic conditions. Significant correlations were observed between ciliate biomass and bacteriochlorophyll e concentration, and between heterotrophic nanoflagellate biomass and chlorophyll a concentration in the water column. The major predators of anaerobic picoplankton were pleuronematine ciliates and cryptomonad flagellates, with clearances of 26.6 and 9.5 nL per cell h.sup.-1, respectively, and a cumulative impact on the picoplankton gross growth rate ranging between 36% and 72%. We concluded that protozoan grazing channels a large proportion of anaerobic picoplankton production to higher trophic levels without restraining photosynthetic bacteria productivity. Author Affiliation: (1)Department of Animal Biology and Marine Ecology, University of Messina, Messina, Italy (2)Group of Molecular Microbial Ecology, Institute of Aquatic Ecology, University of Girona, Girona, Spain (3)Department of Physiology, University of Messina, Messina, Italy Article History: Received 9 February 2009; revised 16 June 2009; accepted 17 June 2009.Final version published online 20 July 2009. Article note: Correspondence: Alessandro Sacca, Department of Animal Biology and Marine Ecology, University of Messina, Salita Sperone 31, S. Agata, 98166 Messina, Italy. Tel.:+39 90 676 5522; fax: +39 90 393 409; e-mail: asacca@unime.it
  • Idioma: English

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