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Temporal Dynamics of River Biofilm in Constant Flows: A Case Study in a Riverside Laboratory Flume

Boulêtreau, Stéphanie and Sellali, Mehdi and Elosegi, Arturo and Nicaise, Yvan and Bercovitz, Yvan and Moulin, Frédéric and Eiff, Olivier and Sauvage, Sabine and Sanchez-Pérez, José-Miguel and Garabétian, Frédéric Temporal Dynamics of River Biofilm in Constant Flows: A Case Study in a Riverside Laboratory Flume. (2010) International Review of Hydrobiology, vol. 95 (n°2). pp. 156-170. ISSN 1434-2944

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Official URL: http://dx.doi.org/10.1002/iroh.200911203

Abstract

A 15-week experiment was performed in a riverside laboratory flume (with diverted river water) to check variations of river biofilm structure (biomass, algal and bacterial compositions) and function (community gross primary production GPP and respiration) under constant flow while water quality went through natural temporal variations. One major suspended matter pulse coinciding with one river flood was recorded after 10 weeks of experiment. Epilithic biofilm first exhibited a 10-week typical pattern of biomass accrual reaching 33 g ash-free dry matter (AFDM) m–2 and 487 mg chlorophyll-a m–2 and then, experienced a shift to dominance of loss processes (loss of 60% AFDM and 80% chlorophyll-a) coinciding with the main suspended matter pulse. Algal diversity remained low and constant during the experiment: Fragilaria capucina and Encyonema minutum always contribute over 80% of cell counts. DGGE banding patterns discriminated between two groups that corresponded to samples before and after biomass loss, indicating major changes in the bacterial community composition. GPP/R remained high during the experiment, suggesting that photoautotrophic metabolism prevailed and detachment was not autogenic (i.e., due to algal senescence or driven by heterotrophic processes within the biofilm). Observational results suggested that silt deposition into the biofilm matrix could have triggered biomass loss.

Item Type:Article
Additional Information:Thanks to John Wiley & Sons editor. The definitive version is available athttp://onlinelibrary.wiley.com/doi/10.1002/iroh.200911203/abstract
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Université de Bordeaux 1 (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Universidad del País Vasco - Euskal Herriko Unibertsitatea (SPAIN)
Other partners > Ecole Pratique des Hautes Etudes - EPHE (FRANCE)
Other partners > Université Montesquieu - Bordeaux 4 (FRANCE)
Laboratory name:
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Deposited By:Nadia Kelmouss

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