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• W2072681002 abstract "AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 48:169-174 (2007) - doi:10.3354/ame048169 Effects of microcurrents in the boundary layer on the attachment of benthic heterotrophic nanoflagellates Marlene Willkomm1,2, Annette Schlüssel1, Ellen Reiz1, Hartmut Arndt1,* 1Department of General Ecology and Limnology, Zoological Institute, University of Cologne, 50923 Cologne, Germany 2Working Group Limnology, Institute of Ecology, Friedrich-Schiller-University Jena, 07745 Jena, Germany *Corresponding author. Email: hartmut.arndt@uni-koeln.de ABSTRACT: Surfaces in running water are covered by a boundary layer. Virtually nothing is known about the importance of water currents in the microenvironment of nanofauna. Many questions have been partially answered concerning the effect of surface topography on the hydrodynamics in the vicinity of macrofauna; however, investigations of the 2 to 5 µm water layer where nanoprotists live have been neglected. In the present study, we show that the flow velocity at a distance of a few micrometres from the substrate is high enough to be very effective regarding the detachment of nanoprotists. We analysed the impact of flow velocity (detachment from substrate) on 8 nanoflagellate taxa (Entosiphon, Cercomonas, Codonosiga, Anthophysa, Bodo, Neobodo, Apusomonas, Spumella) with different abilities to crawl and attach to the surface. A Plexiglas disc was used to generate a defined flow velocity on the surface of a Petri dish microcosm. Laminar flow in the boundary layer was found between 0 and 700 µm above the substratum. The effect of 4 different flow velocities on heterotrophic flagellates was investigated (0.3, 0.6, 0.9 and 1.2 m s–1 at 5 mm above the substratum, corresponding to flow velocities of 0.001 to 0.004 m s–1 at 10 µm above the substratum). The colourless, gliding euglenid Entosiphon sulcatum showed the highest resistance towards high flow velocities. Another species, the crawling cercomonad Cercomonas crassicauda, had the weakest attachment. Small changes in the micro-topography of the substrate (e.g. Ancylus shells) may significantly influence spatial distribution of nanoflagellates. KEY WORDS: Heterotrophic nanoflagellates · Boundary layer · Microcurrents · Biofilm · Flow velocity · Topography Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 48, No. 2. Online publication date: July 10, 2007 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2007 Inter-Research." @default.
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• W2072681002 title "Effects of microcurrents in the boundary layer on the attachment of benthic heterotrophic nanoflagellates" @default.
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• W2072681002 doi "https://doi.org/10.3354/ame048169" @default.
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