- Journal Article
Rights / licenseIn Copyright - Non-Commercial Use Permitted
We consider Lagrangian velocity differences of zooplankters swimming in still water and in turbulence. Using cumulants, we quantify the intermittency properties of their motion recorded using three-dimensional particle tracking velocimetry. Copepods swimming in still water display an intermittent behaviour characterized by a high probability of small velocity increments, and by stretched exponential tails. Low values arise from their steady cruising behaviour while heavy tails result from frequent relocation jumps. In turbulence, we show that at short time scales, the intermittency signature of active copepods clearly differs from that of the underlying flow, and reflects the frequent relocation jumps displayed by these small animals. Despite these differences, we show that copepods swimming in still and turbulent flow belong to the same intermittency class that can be modelled by a log-stable model with non-analytical cumulant generating function. Intermittency in swimming behaviour and relocation jumps may enable copepods to display oriented, collective motion under strong hydrodynamic conditions and thus, may contribute to the formation of zooplankton patches in energetic environments. Show more
Journal / seriesThe European Physical Journal E
Pages / Article No.
Organisational unit09454 - Holzner, Markus (SNF-Prof.) (ehemalig) / Holzner, Markus (SNF-Prof.) (former)
144645 - Turbulence and Particles in Environmental Fluid Dynamics (TIPFluiD) (SNF)
NotesIt was possible to publish this article open access thanks to a Swiss National Licence with the publisher.
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