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Microbial food-web components in two hypertrophic human-impacted Pampean shallow lakes: interactive effects of environmental, hydrological, and temporal drivers

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Abstract

Few studies have intensively assessed the dynamic of all planktonic components and their microbial communities in hypertrophic shallow lakes. The aim of this work was to study the potential drivers shaping the microbial food-web components (heterotrophic bacteria and strictly phototrophic microplankton). Thus, we studied the monthly abundances and functional groups of the different planktonic food-web components (heterotrophic bacteria, picocyanobacteria, picoeukaryotes, heterotrophic flagellates, ciliates, phytoplankton, zooplankton) in two interconnected and hypertrophic Pampean shallow lakes (Gómez and Carpincho) during dry–wet periods (27-month study). We hypothesized that temporal (intra and inter-annual) factors exert a major role in shaping the microbial food-web components in both lakes. Both shallow lakes showed similar dynamic in the environmental variables, that followed inter-annual and seasonal variations. In Gómez, the variation of microbial components was mainly explained by a combination of environmental, predation, and temporal factors (38.2%), whereas in Carpincho by pure temporal drivers (31.8%). Microbial and predator components were significantly different between dry and wet periods. The connection and closeness between both lakes seem not to play a major role in the factors driving the microbial component abundances. These lakes are strongly influenced by temporal factors, which regulate not only the microbial components, but also the physical, chemical, and biological variables.

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Acknowledgements

We thank Viviana Lobato for her aid during sampling campaigns and Irina Izaguirre for her general support. This study was supported by the National Council of Scientific and Technical Research (Network project for the assessment and monitoring of Pampean shallow lakes, PAMPA2) and the National Agency of Scientific and Technical Promotion (PICT 2014-0918).

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Authors and Affiliations

  1. Centro de Investigaciones y transferencia del Noroeste de la Provincia de Buenos Aires (CITNOBA, CONICET-UNNOBA-UNSADA), 6000, Junín, Argentina

    M. R. Schiaffino & C. Li Puma

  2. Instituto de Investigaciones Biotecnológicas-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

    N. Diovisalvi, P. Fermani, L. Lagomarsino & M. V. Quiroga

  3. Dirección General de Estadística Universitaria, Universidad Nacional de Rosario (UNR), Rosario, Argentina

    D. Marfetán Molina

  4. Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA) - Centro Científico Tecnológico CONICET - Patagonia Norte, Bariloche, Argentina

    G. L. Pérez

Authors
  1. M. R. Schiaffino
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  2. N. Diovisalvi
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  3. D. Marfetán Molina
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  4. P. Fermani
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  5. C. Li Puma
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  6. L. Lagomarsino
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  7. M. V. Quiroga
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  8. G. L. Pérez
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Corresponding author

Correspondence to M. R. Schiaffino.

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Handling editor: Stefano Amalfitano

Electronic supplementary material

Below is the link to the electronic supplementary material.

10750_2018_3874_MOESM1_ESM.eps

Supplementary Fig. 1. Correlations between the microbial component similarity matrices (Bray–Curtis) and the water level difference matrices (Euclidean distances) in Gómez (a) and Carpincho (b) using Mantel tests. Supplementary material 1 (EPS 4613 kb)

10750_2018_3874_MOESM2_ESM.eps

Supplementary Fig. 2. Temporal variation of values along the significant (P < 0.05) axes of canonical asymmetric eigenvector maps (AEM) models of the Napierian-transformed microbial community matrix, constructed using forward selection of positive (black curves) and negatives (red curves) AEM. AEM were selected at the 0.05 level. Supplementary material 2 (EPS 6645 kb)

Supplementary material 3 (DOCX 46 kb)

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Schiaffino, M.R., Diovisalvi, N., Marfetán Molina, D. et al. Microbial food-web components in two hypertrophic human-impacted Pampean shallow lakes: interactive effects of environmental, hydrological, and temporal drivers. Hydrobiologia 830, 255–276 (2019). https://doi.org/10.1007/s10750-018-3874-7

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  • DOI: https://doi.org/10.1007/s10750-018-3874-7

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