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Microbial pelagic metabolism and CDOM characterization in a phytoplankton-dominated versus a macrophyte-dominated shallow lake

  • ARGENTINE PAMPEAN SHALLOW LAKES
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Abstract

Dominant primary producer in macrophyte- or phytoplankton-dominated shallow lakes might imply differences in dissolved organic carbon (DOC) composition. We compared chromophoric dissolved organic matter (CDOM), plankton respiration (R), and bacterial (BP) and primary production (PP), in two contrasting shallow lakes. We hypothesized that DOC from the macrophyte-dominated lake would be qualitatively inferior, so that it can support a lower yield than DOC from the phytoplankton-dominated one. Macrophyte-dominated lake had more humic and aromatic CDOM, though molecular weight was similar in both lakes. A clear synchronism between lakes was observed in mean depth and several CDOM absorption coefficients, suggesting an external driver of the variation in DOC concentration and CDOM quality. The positive BP-PP and BP-Chl-a correlations in the macrophyte-dominated lake point out to a dependence of bacteria on phytoplankton for a supply of labile DOC. In turn, BP in the phytoplankton-dominated lake was balanced with grazing by HF (heterotrophic flagellates). The significantly higher HB:DOC and HF:DOC carbon ratios in the phytoplankton-dominated lake also suggest that better DOC quality would mean relatively more efficient C transfer to higher trophic levels. According to PP:BP and PP:R ratios both lakes should be considered autotrophic, although the macrophyte-dominated lake would be comparatively more heterotrophic.

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Acknowledgment

This study was supported by the Argentine network for the assessment and monitoring of Pampean shallow lakes (PAMPA2—CONICET), ANPCyT (PICT-2011-1029), CONICET (PIP-01301), and UNSAM (SC08/043). We thank Roberto Escaray for field assistance and nitrogen estimations, Carla Passerini for the measurement of primary and bacterial productions, and Patricia Rodriguez for help with the scintillation counter.

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  1. Departamento de Ciencias Básicas, Universidad Nacional de Luján (UNLu) - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), CC 221, (B6700ZBA) Luján, Buenos Aires, Argentina

    A. Torremorell

  2. Instituto Investigaciones en Biodiversidad y Medio Ambiente (INIBIOMA), Universidad Nacional del Comahue (UNComa) - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Quintral 1250, (R8400FRF) Bariloche, Río Negro, Argentina

    G. Pérez & C. Queimaliños

  3. Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomus (IIB-INTECH), Universidad Nacional de San Martín (UNSAM) - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Intendente Marino Km 8,200, (B7130IWA) Chascomús, Buenos Aires, Argentina

    L. Lagomarsino, P. Huber, J. Bustingorry, P. Fermani, M. E. Llames & F. Unrein

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  1. A. Torremorell
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  8. M. E. Llames
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  9. F. Unrein
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Correspondence to F. Unrein.

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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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Torremorell, A., Pérez, G., Lagomarsino, L. et al. Microbial pelagic metabolism and CDOM characterization in a phytoplankton-dominated versus a macrophyte-dominated shallow lake. Hydrobiologia 752, 203–221 (2015). https://doi.org/10.1007/s10750-014-2057-4

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  • DOI: https://doi.org/10.1007/s10750-014-2057-4

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