Noise-induced schooling of fish

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2020
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Morris, Richard G.
Amith-Kumar, U. R.
Danny Raj, M.
Rogers, Tim
Rajendran, Harikrishnan
Guttal, Vishwesha
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Nature Physics. Springer Nature. 2020, 16, pp. 488-493. ISSN 1745-2473. eISSN 1745-2481. Available under: doi: 10.1038/s41567-020-0787-y
Zusammenfassung

We report on the dynamics of collective alignment in groups of the cichlid fish Etroplus suratensis. Focusing on small- to intermediate-sized groups (10 ≲ N ≲ 100), we demonstrate that schooling (highly polarized and coherent motion) is noise induced, arising from the intrinsic stochasticity associated with finite numbers of interacting fish. The fewer the fish, the greater the (multiplicative) noise and therefore the greater the likelihood of alignment. Such rare empirical evidence tightly constrains the possible underlying interactions that govern fish alignment, suggesting that E. suratensis either spontaneously change their direction or copy the direction of another fish, without any local averaging (the otherwise canonical mechanism of collective alignment). Our study therefore highlights the importance of stochasticity in behavioural inference. Furthermore, rather than simply obscuring otherwise deterministic dynamics, noise can be fundamental to the characterization of emergent collective behaviours.

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570 Biowissenschaften, Biologie
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ISO 690JHAWAR, Jitesh, Richard G. MORRIS, U. R. AMITH-KUMAR, M. DANNY RAJ, Tim ROGERS, Harikrishnan RAJENDRAN, Vishwesha GUTTAL, 2020. Noise-induced schooling of fish. In: Nature Physics. Springer Nature. 2020, 16, pp. 488-493. ISSN 1745-2473. eISSN 1745-2481. Available under: doi: 10.1038/s41567-020-0787-y
BibTex
@article{Jhawar2020Noise-56029,
  year={2020},
  doi={10.1038/s41567-020-0787-y},
  title={Noise-induced schooling of fish},
  volume={16},
  issn={1745-2473},
  journal={Nature Physics},
  pages={488--493},
  author={Jhawar, Jitesh and Morris, Richard G. and Amith-Kumar, U. R. and Danny Raj, M. and Rogers, Tim and Rajendran, Harikrishnan and Guttal, Vishwesha}
}
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