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Exploration of riffle-scale interactions between abiotic variables and microbial assemblages in the hyporheic zone

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Molecular methods were applied to explore the composition of hyporheic bacterial assemblages and their possible interaction with interstitial physicochemical variables. Hyporheic flows on a riffle were manipulated (a downwelling zone was converted to an upwelling zone and vice versa) in order to examine the influence of vertical flow patterns on microbial assemblages. Bacterial assemblages were heterogeneously distributed throughout the riffle, the greatest similarity among them occurring at similar depths rather than in areas of similar flow regimes (upwelling versus downwelling). There was no correlation between the measured physicochemical variables and the microbial assemblages, with the exception of depth and sediment particle size. The flow manipulation in the original downwelling zone appeared to have had an effect on the microbial assemblages, although this influence may have been primarily due to a change in temperature in the manipulated region rather than an alteration of the vertical-flow direction per se.

Des méthodes moléculaires nous ont servi à explorer la composition des peuplements hyporhéiques de bactéries et leurs interactions possibles avec les variables physicochimiques du milieu interstitiel. Nous avons manipulé l'écoulement hyporhéique dans une zone de rapides (une zone d'enfoncement des eaux a été transformée en zone de remontée et inversement) afin d'étudier l'influence des patterns d'écoulement vertical sur les peuplements microbiens. Les peuplements microbiens se répartissent de façon hétérogène dans la zone de rapides et les plus fortes similarités entre les peuplements s'observent aux profondeurs semblables plutôt que dans les zones à régime d'écoulement similaire (enfoncement ou remontée). Il n'y a pas de corrélation entre les peuplements microbiens et les variables physicochimiques mesurées, sauf la profondeur et la taille des particules du sédiment. La manipulation de l'écoulement dans la zone originale d'enfoncement de l'eau semble avoir eu un effet sur le peuplement microbien, bien que l'influence puisse peut-être s'expliquer plus par le changement de température dans la région manipulée que par le changement de l'écoulement vertical en lui-même.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2005

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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