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Biofilm functional responses to the rehydration of a dry intermittent stream

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Abstract

Intermittent water flow regimes characterize streams in many world regions, especially those with arid and semiarid climates. During cease to flow conditions, biofilms on streambed sediments may be exposed to desiccation. Environmental conditions and resource availability change with desiccation and may influence biofilm functioning and whole stream ecosystem processes. Rainfall events during the nonflow phase can rehydrate streambed sediments, but the effect of these pulses on biofilm functioning is unclear. This study aimed to analyze the effects of a rehydration event on biofilm functional diversity during the nonflow period in a subtropical Australian stream. Biofilms from three different stream pools on the same reach; one permanently water-covered and the other two differing in their desiccation time were studied. Biofilms initially differed owing to the time they were exposed to dry conditions but rehydration events significantly increased biofilm functional diversity, producing a “reset” effect on the desiccation exposure, as after that bacterial functioning decreased again because of the new dry conditions. The observed rapid biofilm responses to rehydration during flow intermittency might be essential in sustaining biofilm functional diversity in intermittent streams.

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Acknowledgments

The authors thank Lars Pelzer for field assistance. Xisca Timoner was recipient of a PhD fellowship from the Spanish Ministry of science and technology (AP-2007-01945). This research was funded by the projects SCARCE (CONSOLIDER-INGENIO CSD2009-00065), and the CARBONET (CGL2011-30474-C02-01) of the Spanish Ministry of Science and Innovation.

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Authors and Affiliations

  1. Catalan Institute for Water Research (ICRA), Science and Technology Park of the University of Girona, Carrer Emili Grahit 101, H2O Building, 17003, Girona, Spain

    Xisca Timoner, V. Acuña & S. Sabater

  2. Institute of Aquatic Ecology, University of Girona, Campus Montilivi s/n, 17003, Girona, Spain

    Xisca Timoner & S. Sabater

  3. Australian Rivers Institute, Griffith University, Nathan Campus, 170 Kessels Road, Nathan, Brisbane, QLD, 4111, Australia

    L. Frampton, P. Pollard & S. E. Bunn

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  1. Xisca Timoner
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  2. V. Acuña
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  3. L. Frampton
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  5. S. Sabater
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Correspondence to Xisca Timoner.

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Handling editor: Stefano Amalfitano

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Timoner, X., Acuña, V., Frampton, L. et al. Biofilm functional responses to the rehydration of a dry intermittent stream. Hydrobiologia 727, 185–195 (2014). https://doi.org/10.1007/s10750-013-1802-4

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