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Microbial biofilm structure and organic matter use in mediterranean streams

River and stream biofilms in mediterranean fluvial ecosystems face both extreme seasonality as well as arrhythmic fluctuations. The hydrological extremes (droughts and floods) impose direct changes in water availability but also in the quantity and quality of organic matter and nutrients that sustain the microbial growth. This review analyzes how these ecological pulses might determine unique properties of biofilms developing in mediterranean streams. The paper brings together data from heterotrophic and autotrophic community structure, and extracellular enzyme activities in biofilms in mediterranean streams. Mediterranean stream biofilms show higher use of peptides during the favorable period for epilithic algae development (spring), and preferential use of cellulose and hemicellulose in autumn as a response to allochthonous input. The drying process causes the reduction in bacterial production and chlorophyll biomass, but the rapid recovery of both autotrophs and heterotrophs with rewetting indicates their adaptability to fluctuations. Bacteria surviving the drought are mainly associated with sediment and leaf litter which serve as "humid refuges". Some algae and cyanobacteria show resistant strategies to cope with the drought stress. The resistance to these fluctuations is strongly linked to the streambed characteristics (e.g., sediment grain size, organic matter accumulation, nutrient content)

This study was funded by the projects CGL2011-30151-C02-01, and SCARCE (Consolider-Ingenio 2010 CSD2009-00065) of the Spanish Ministry of Economy and Competitiveness; the Italy-Spain Exchange Project CNR-CSIC 2006IT0010; and the EU project MIRAGE (FP7-ENV-2007-1 n.211732)

¬© Hydrobiologia, 2013, vol. 719, n√ļm. 1, p. 43-58

Springer Verlag

Author: Romaní i Cornet, Anna M.
Amalfitano, Stefano
Artigas Alejo, Joan
Fazi, Stefano
Sabater, Sergi
Timoner Amer, Xisca
Ylla i Monfort, Irene
Zoppini, Annamaria
Date: 2013
Abstract: River and stream biofilms in mediterranean fluvial ecosystems face both extreme seasonality as well as arrhythmic fluctuations. The hydrological extremes (droughts and floods) impose direct changes in water availability but also in the quantity and quality of organic matter and nutrients that sustain the microbial growth. This review analyzes how these ecological pulses might determine unique properties of biofilms developing in mediterranean streams. The paper brings together data from heterotrophic and autotrophic community structure, and extracellular enzyme activities in biofilms in mediterranean streams. Mediterranean stream biofilms show higher use of peptides during the favorable period for epilithic algae development (spring), and preferential use of cellulose and hemicellulose in autumn as a response to allochthonous input. The drying process causes the reduction in bacterial production and chlorophyll biomass, but the rapid recovery of both autotrophs and heterotrophs with rewetting indicates their adaptability to fluctuations. Bacteria surviving the drought are mainly associated with sediment and leaf litter which serve as "humid refuges". Some algae and cyanobacteria show resistant strategies to cope with the drought stress. The resistance to these fluctuations is strongly linked to the streambed characteristics (e.g., sediment grain size, organic matter accumulation, nutrient content)
This study was funded by the projects CGL2011-30151-C02-01, and SCARCE (Consolider-Ingenio 2010 CSD2009-00065) of the Spanish Ministry of Economy and Competitiveness; the Italy-Spain Exchange Project CNR-CSIC 2006IT0010; and the EU project MIRAGE (FP7-ENV-2007-1 n.211732)
Format: application/pdf
ISSN: 0018-8158 (versió paper)
1573-5117 (versió electrònica)
Document access: http://hdl.handle.net/10256/11551
Language: eng
Publisher: Springer Verlag
Collection: MICINN/PN 2012-2014/CGL2011-30151-C02-01
MICINN/PN 2009-2014/CSD2009-00065
Reproducció digital del document publicat a: http://dx.doi.org/10.1007/s10750-012-1302-y
Articles publicats (D-CCAA)
Is part of: ¬© Hydrobiologia, 2013, vol. 719, n√ļm. 1, p. 43-58
Rights: Tots els drets reservats
Subject: Ecologia microbiana
Microbial ecology
Biofilms
Bacteris
Bacteria
Title: Microbial biofilm structure and organic matter use in mediterranean streams
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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