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dc.contributor.author
Sommer, Tobias
dc.contributor.author
Danza, Francesco
dc.contributor.author
Berg, Jasmine
dc.contributor.author
Sengupta, Anupam
dc.contributor.author
Constantinescu, George
dc.contributor.author
Tokyay, Talia
dc.contributor.author
Bürgmann, Helmut
dc.contributor.author
Dressler, Y.
dc.contributor.author
Sepúlveda Steiner, Oscar
dc.contributor.author
Schubert, Carsten
dc.contributor.author
Tonolla, Mauro
dc.contributor.author
Wüest, Alfred
dc.date.accessioned
2017-12-01T11:06:23Z
dc.date.available
2017-10-28T02:35:37Z
dc.date.available
2017-12-01T11:06:23Z
dc.date.issued
2017-09-28
dc.identifier.issn
0094-8276
dc.identifier.issn
1944-8007
dc.identifier.other
10.1002/2017GL074868
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/201937
dc.identifier.doi
10.3929/ethz-b-000201937
dc.description.abstract
Swimming organisms can enhance mixing in their natural environments by creating eddies in their wake and by dragging water along. However, these mixing mechanisms are inefficient for microorganisms, because swimming-induced variations in velocity, temperature, and dissolved substances are evened out before they can be advected. In bioconvection, however, microorganisms induce water movement not by propulsion directly but by locally changing the fluid density, which drives convection. Observations of bioconvection have so far mainly been limited to laboratory settings. We report the first observation and quantification of bioconvection within a stratified natural water body. Using in situ measurements, laboratory experiments, and numerical simulations, we demonstrate that the bacterium Chromatium okenii is capable of mixing 0.3 to 1.2 m thick water layers at around 12 m water depth in the Alpine Lake Cadagno (Switzerland). As many species are capable of driving bioconvection, this phenomenon potentially plays a role in species distributions and influences large-scale phenomena like algal blooms.
en_US
dc.language.iso
en
en_US
dc.publisher
American Geophysical Union; Wiley
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject
Chromatium okenii
en_US
dc.subject
Cadagno
en_US
dc.subject
Bioconvection
en_US
dc.subject
Biogenic mixing
en_US
dc.subject
Microstructure
en_US
dc.title
Bacteria-induced mixing in natural waters
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2017-09-22
ethz.journal.title
Geophysical Research Letters
ethz.journal.volume
44
en_US
ethz.journal.issue
18
en_US
ethz.journal.abbreviated
Geophys. res. lett.
ethz.pages.start
9424
en_US
ethz.pages.end
9432
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-10-28T02:35:38Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-12-01T11:06:29Z
ethz.rosetta.lastUpdated
2018-08-03T03:17:04Z
ethz.rosetta.versionExported
true
ethz.COinS
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