Publikation: In situ measurements of turbulence in fish shoals
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Datum
2010
Autor:innen
Lorke, Andreas
Probst, Wolfgang Nikolaus
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Open Access Green
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Core Facility der Universität Konstanz
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Limnology and Oceanography. 2010, 55(1), pp. 354-364. eISSN 0024-3590. Available under: doi: 10.4319/lo.2010.55.1.0354
Zusammenfassung
Turbulence was measured in situ within shoals of juvenile perch Perca fluviatilis with a self-contained autonomous microstructure profiler near an artificial reef in Lake Constance, Germany. Depth-averaged dissipation rates of turbulent kinetic energy (TKE) correlated with the density of shoaling fish, providing evidence for fish-induced turbulence in a large and stratified lake. The observed range and the depth-averaged values of TKE dissipation rates associated with fish-generated turbulence were comparable with magnitudes of turbulence typically caused by internal waves or wind forcing. Enhanced turbulence within fish shoals could only be observed during periods of low background turbulence and high fish abundance. The observed rates of dissipation of TKE are about two orders of magnitude smaller than production rates of TKE estimated from empirical models on the basis of observed fish size and swimming speed.
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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
Schlagwörter
echosounder, microstructure profiler, perch, turbulent kinetic energy
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LORKE, Andreas, Wolfgang Nikolaus PROBST, 2010. In situ measurements of turbulence in fish shoals. In: Limnology and Oceanography. 2010, 55(1), pp. 354-364. eISSN 0024-3590. Available under: doi: 10.4319/lo.2010.55.1.0354BibTex
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year={2010},
doi={10.4319/lo.2010.55.1.0354},
title={In situ measurements of turbulence in fish shoals},
number={1},
volume={55},
journal={Limnology and Oceanography},
pages={354--364},
author={Lorke, Andreas and Probst, Wolfgang Nikolaus}
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<dcterms:abstract xml:lang="eng">Turbulence was measured in situ within shoals of juvenile perch Perca fluviatilis with a self-contained autonomous microstructure profiler near an artificial reef in Lake Constance, Germany. Depth-averaged dissipation rates of turbulent kinetic energy (TKE) correlated with the density of shoaling fish, providing evidence for fish-induced turbulence in a large and stratified lake. The observed range and the depth-averaged values of TKE dissipation rates associated with fish-generated turbulence were comparable with magnitudes of turbulence typically caused by internal waves or wind forcing. Enhanced turbulence within fish shoals could only be observed during periods of low background turbulence and high fish abundance. The observed rates of dissipation of TKE are about two orders of magnitude smaller than production rates of TKE estimated from empirical models on the basis of observed fish size and swimming speed.</dcterms:abstract>
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