The relationship between epilithic biofilm stability and its associated meiofauna under two patterns of flood disturbance

Habitat stability is an important driver of ecological community composition and development. River epilithic biofilms are particularly unstable habitats for the establishment of benthic communities because they are regularly disturbed by floods. Our aim was to determine the influence of habitat ins...

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Bibliographic Details
Published in:Freshwater science 2012-03, Vol.31 (1), p.38-50
Main Authors: Majdi, Nabil, Mialet, Benoît, Boyer, Stéphanie, Tackx, Michèle, Leflaive, Joséphine, Boulêtreau, Stéphanie, Ten-Hage, Loïc, Julien, Frédéric, Fernandez, Robert, Buffan-Dubau, Evelyne
Format: Article
Language:English
Subjects:
benthic organisms
biofilm
Biofilms
Biomass
Cobbles
community development
community structure
Cyanobacteria
Diatoms
Floods
Flow velocity
habitat stability
habitats
hydrodynamics
hydrologic factors
meiobenthos
microalgae
Nematoda
Nematode larvae
Nematodes
periphyton
Pigments
recolonization
resilience
rivers
Rotifera
rotifers
sediments
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Summary:Habitat stability is an important driver of ecological community composition and development. River epilithic biofilms are particularly unstable habitats for the establishment of benthic communities because they are regularly disturbed by floods. Our aim was to determine the influence of habitat instability on meiobenthic organisms. We hypothesized that hydrologic variables are the most important predictors of meiofauna distribution. We monitored epilithic communities (meiofauna and microalgae) with a high sampling frequency during 2 sampling periods with contrasting hydrodynamic patterns in a temperate river (the Garonne, France). Nematodes and rotifers dominated meiofaunal assemblages. The critical flow velocity threshold for their maintenance in the biofilm was ∼30 cm/s, a result suggesting that meiofauna can resist higher flow velocity within the biofilm than within sediments. Nematode distribution was primarily influenced by the duration of undisturbed periods, whereas rotifer distribution was also correlated with the thickness of the biofilm. During the periods after floods, rotifers were faster colonizers than nematodes. Collectively, our results show that flow regime was an essential driver for biofilm community development.
ISSN:2161-9549
2161-9565
2161-9565
DOI:10.1899/11-073.1