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Microbial abundance patterns along a transparency gradient suggest a weak coupling between heterotrophic bacteria and flagellates in eutrophic shallow Pampean lakes

  • ARGENTINE PAMPEAN SHALLOW LAKES
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Abstract

The aim of this work was to study the components of the microbial food web and the degree of coupling between heterotrophic bacteria (HB) and heterotrophic flagellates (HF) in different shallow lakes of the Pampa Plain over a wide range of water transparency and nutrient levels. We hypothesized that not all microorganisms (i.e., HB, HF) equally increase with nutrient levels, thus, resulting in a weaker degree of coupling between HB and HF in more eutrophic waters. During the spring–summer 2009–2011, we sampled 40 Pampean lakes situated in different watershed of Buenos Aires Province. Abundances of most microbial components were very high, even higher than those reported in the literature. HB as well as picocyanobacteria (Pcy) increases with trophic state, while no clear relationship was found between protist (HF or ciliates) and Chl-a concentrations or nutrient levels. Photosynthetic picoplankton was generally dominated by phycocyanin-rich Pcy. Lakes with high HB and low HF were abundant, which suggest these components were weakly coupled. Based on the abundance of microorganisms, we do not accumulate enough evidence to segregate Pampean lakes into two discrete groups (clear vs turbid).

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Acknowledgments

We thank Anselmo Reggiardo for his helpful comments and Josep M. Gasol for sharing the original data set from Gasol (1994). We also acknowledge the Editor in chief and two anonymous reviewers for their valuable comments on the manuscript. This work was supported by The Argentinean network for the assessment and monitoring of Pampean shallow lakes (PAMPA2), and by Agencia Nacional de Promoción Científica y Tecnológica, PICT (PICT07-00429).

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Authors and Affiliations

  1. Laboratorio de Ecología y Fotobiología Acuática, Instituto Tecnológico de Chascomús, (IIB-INTECH), Universidad Nacional de San Martín (UNSAM), Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET), CC 164, B7130IWA, Chascomús, Provincia de Buenos Aires, Argentina

    Paulina Fermani, Ana Torremorell, Leonardo Lagomarsino, Roberto Escaray & Fernando Unrein

  2. Programa de Ecología de Protistas, Departamento de Ciencias Básicas, Universidad Nacional de Luján, Luján, Provincia de Buenos Aires, Argentina

    Ana Torremorell

  3. Laboratorio de Fotobiología Instituto INIBIOMA (CRUB Comahue, CONICET), CP 8400, Bariloche, Río Negro, Argentina

    Gonzalo Pérez

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  1. Paulina Fermani
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  2. Ana Torremorell
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  3. Leonardo Lagomarsino
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  4. Roberto Escaray
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  5. Fernando Unrein
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  6. Gonzalo Pérez
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Correspondence to Leonardo Lagomarsino.

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Guest editors: I. Izaguirre, L. A. Miranda, G. M. E. Perillo, M. C. Piccolo & H. E. Zagarese / Shallow Lakes from the Central Plains of Argentina

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Fermani, P., Torremorell, A., Lagomarsino, L. et al. Microbial abundance patterns along a transparency gradient suggest a weak coupling between heterotrophic bacteria and flagellates in eutrophic shallow Pampean lakes. Hydrobiologia 752, 103–123 (2015). https://doi.org/10.1007/s10750-014-2019-x

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  • DOI: https://doi.org/10.1007/s10750-014-2019-x

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