2015
DOI: 10.1242/jeb.121707
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Simultaneous measurement of 3D zooplankton trajectories and surrounding fluid velocity field in complex flows

Abstract: We describe an automated, volumetric particle image velocimetry (PIV) and tracking method that measures time-resolved, 3D zooplankton trajectories and surrounding volumetric fluid velocity fields simultaneously and non-intrusively. The method is demonstrated for groups of copepods flowing past a wall-mounted cylinder. We show that copepods execute escape responses when subjected to a strain rate threshold upstream of a cylinder, but the same threshold range elicits no escape responses in the turbulent wake dow… Show more

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Cited by 13 publications
(9 citation statements)
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“…Since escape reactions in calanoid copepods are usually much more powerful, e.g., 150 mm or more in E. affinis ( 8 , 32 ) and also shorter than relocation jumps ( 35 , 36 ), these results suggest that these organisms, when swimming in quasi-homogeneous and isotropic turbulence, do not in most cases perform escape jumps when sensing localized turbulence events. This observation is consistent with a recent study on the behavior of Acartia tonsa swimming freely in a recirculating channel ( 37 ). The authors observed powerful escape jumps in the laminar region directly upstream of a cylinder in response to strain rates as low as 0.25 , but not in its turbulent wake, despite fluctuating strain rates up to 20 .…”
Section: Resultssupporting
confidence: 93%
“…Since escape reactions in calanoid copepods are usually much more powerful, e.g., 150 mm or more in E. affinis ( 8 , 32 ) and also shorter than relocation jumps ( 35 , 36 ), these results suggest that these organisms, when swimming in quasi-homogeneous and isotropic turbulence, do not in most cases perform escape jumps when sensing localized turbulence events. This observation is consistent with a recent study on the behavior of Acartia tonsa swimming freely in a recirculating channel ( 37 ). The authors observed powerful escape jumps in the laminar region directly upstream of a cylinder in response to strain rates as low as 0.25 , but not in its turbulent wake, despite fluctuating strain rates up to 20 .…”
Section: Resultssupporting
confidence: 93%
“…Nikoueeyan and Naughton, 2018;Dussol et al, 2016). As an alternative to MSV, it is possible to use two sources of illumination and multiple cameras to simultaneously acquire the different channels (Adhikari et al, 2015). However, such a system results in higher cost and greater computational time for image registration of the different camera views relative to MSV.…”
Section: Resultsmentioning
confidence: 99%
“…Outside the fluid dynamics field, trajectory data is employed in other fields such as human crowd tracking [11], biology applications [12,13,14], medicine and other fields. All may benefit from this package, which is agnostic of the source of the particle database.…”
Section: Operating Systemmentioning
confidence: 99%