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Dynamics of a benthic microbial community in a riverine environment subject to hydrological fluctuations (Mulargia River, Italy)

  • Global Change and River Ecosystems
  • Chapter
Global Change and River Ecosystems—Implications for Structure, Function and Ecosystem Services

Part of the book series: Developments in Hydrobiology 215 ((DIHY,volume 215))

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Abstract

Temporary rivers are characterized by recurrent dry phases, and global warming will stress their hydrology by amplifying extreme events. Microbial degradation and transformation of organic matter (OM) in riverbed sediment are key processes with regard to carbon and nutrient fluxes. In this study, we describe structural and functional changes of benthic microbial communities in a riverine environment subject to hydrological fluctuation. Sampling was carried out in the outlet section of the Mulargia River (Sardinia, Italy) under various water regimes, including one flood event. Overall, sediments were characterized by low bacterial cell abundance (range 0.6–1.8 × 109 cell g−1) as a consequence of their low nutrient and OM concentrations. No major differences were found in the community composition. Alpha-Proteobacteria dominated during the whole year (range 21–30%) followed by Beta-Proteobacteria, Gamma-Proteobacteria, and Cytophaga-Flavobacteria which always contributed <18%. Planctomycetes and Firmicutes were found in smaller amounts (<7%). In spring, when the highest total organic carbon content was also detected (0.42% w/w), both bacterial abundance and C production (BCP, 170 nmol C h−1 g−1) reached relatively high values. During the flood event, an increase in BCP and the highest values of community respiration (CR, 74 nmol C h−1 g−1) were observed. Moreover, most of the extracellular enzyme activities (EEA) changed significantly during the flood. The variation of the water flow itself can explain part of these changes and other factors also come into play. The presence of different patterns of functional parameters could suggest that the quality of the OM could be the major driving force in nutrient flux.

Guest editors: R. J. Stevenson, S. Sabater / Global Change and River Ecosystems – Implications for Structure, Function and Ecosystem Services

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  1. Water Research Institute (IRSA-CNR), Via Salaria Km 29.300, 00015, CP 10, Monterotondo, Rome, Italy

    Annamaria Zoppini, Stefano Amalfitano, Stefano Fazi & Alberto Puddu

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  1. Annamaria Zoppini
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  2. Stefano Amalfitano
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Correspondence to Annamaria Zoppini .

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  1. Center for Water Sciences, Department of Zoology, University of Michigan, East Lansing, USA

    R. Jan Stevenson

  2. Institute of Aquatic Ecology at the University of Girona, Girona, Spain

    Sergi Sabater

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Zoppini, A., Amalfitano, S., Fazi, S., Puddu, A. (2010). Dynamics of a benthic microbial community in a riverine environment subject to hydrological fluctuations (Mulargia River, Italy). In: Stevenson, R.J., Sabater, S. (eds) Global Change and River Ecosystems—Implications for Structure, Function and Ecosystem Services. Developments in Hydrobiology 215, vol 215. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0608-8_4

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