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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
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Official URL: http://dx.doi.org/10.1098/rsif.2021.0114
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 | |||||||||||||||||||||||||||
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| Subjects: | Q Science > QL Zoology | |||||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics Faculty of Science, Engineering and Medicine > Science > Physics |
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| 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 | |||||||||||||||||||||||||||
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| 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 | |||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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