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Whirligig beetles as corralled active Brownian particles

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Devereux, Harvey L., Twomey, Colin R., Turner, Matthew S. and Thutupalli, Shashi (2021) Whirligig beetles as corralled active Brownian particles. Journal of The Royal Society Interface, 18 (177). 20210114. doi:10.1098/rsif.2021.0114 ISSN 1742-5689.

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Official URL: http://dx.doi.org/10.1098/rsif.2021.0114

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Abstract

We study the collective dynamics of groups of whirligig beetles Dineutus discolor (Coleoptera: Gyrinidae) swimming freely on the surface of water. We extract individual trajectories for each beetle, including positions and orientations, and use this to discover (i) a density-dependent speed scaling like v ∼ ρ−ν with ν ≈ 0.4 over two orders of magnitude in density (ii) an inertial delay for velocity alignment of approximately 13 ms and (iii) coexisting high and low-density phases, consistent with motility-induced phase separation (MIPS). We modify a standard active Brownian particle (ABP) model to a corralled ABP (CABP) model that functions in open space by incorporating a density-dependent reorientation of the beetles, towards the cluster. We use our new model to test our hypothesis that an motility-induced phase separation (MIPS) (or a MIPS like effect) can explain the co-occurrence of high- and low-density phases we see in our data. The fitted model then successfully recovers a MIPS-like condensed phase for N = 200 and the absence of such a phase for smaller group sizes N = 50, 100.

Item Type: Journal Article
Subjects: Q Science > QL Zoology
Divisions: Faculty of Science, Engineering and Medicine > Science > Mathematics
Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Gyrinidae , Biology -- Mathematical models, Brownian motion processes, Insects -- Behavior
Journal or Publication Title: Journal of The Royal Society Interface
Publisher: The Royal Society Publishing
ISSN: 1742-5689
Official Date: 14 April 2021
Dates:
DateEvent
14 April 2021Published
23 March 2021Accepted
Volume: 18
Number: 177
Article Number: 20210114
DOI: 10.1098/rsif.2021.0114
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 20 April 2021
Date of first compliant Open Access: 21 April 2021
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/L015374/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
DGE-0646086National Science Foundationhttp://dx.doi.org/10.13039/501100008982
12-R&D-TFR-5.04-0800Department of Atomic Energy, Government of Indiahttp://dx.doi.org/10.13039/501100001502
12-R&D-TFR-5.10-1100Department of Atomic Energy, Government of Indiahttp://dx.doi.org/10.13039/501100001502
287975Simons Foundationhttp://dx.doi.org/10.13039/100000893
UNSPECIFIEDMax-Planck-Gesellschafthttp://dx.doi.org/10.13039/501100004189
UNSPECIFIEDLeverhulme Trusthttp://dx.doi.org/10.13039/501100000275
UNSPECIFIEDJapan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691

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