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Predation on schooling fish is shaped by encounters between prey during school formation using an Ideal Gas Model of animal movement

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  • de Kerckhove, Derrick T.
  • Shuter, Brian J.

Abstract

Fish schools reduce their predators' encounter rates not only by performing evasive maneuvers but also by increasing distances between prey patches. However, a similar challenge applies to isolated prey fish seeking refuge during periods of diel school formation. We demonstrate with an Ideal Gas movement model that as the stock sizes of a fish who forms schools daily decreases, school densities do not change, yet their average sizes become smaller and the numbers of isolated prey increases dramatically. In this scenario, predator encounter rates remain remarkably equivalent across a few orders of magnitude in stock sizes, with a marginal peak at intermediate prey densities. However, even slight benefits from predator evasion maneuvers would decrease predation rates on larger schools substantially. In support we found empirically that higher proportions of prey fish fail to join schools at low stock sizes and that predator consumption rates decline as prey stock size increases.

Suggested Citation

  • de Kerckhove, Derrick T. & Shuter, Brian J., 2022. "Predation on schooling fish is shaped by encounters between prey during school formation using an Ideal Gas Model of animal movement," Ecological Modelling, Elsevier, vol. 470(C).
  • Handle: RePEc:eee:ecomod:v:470:y:2022:i:c:s0304380022001193
    DOI: 10.1016/j.ecolmodel.2022.110008
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    References listed on IDEAS

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    1. Derrick T. de Kerckhove & Scott Milne & Brian J. Shuter & Peter A. Abrams, 2015. "Ideal gas model adequately describes movement and school formation in a pelagic freshwater fish," Behavioral Ecology, International Society for Behavioral Ecology, vol. 26(4), pages 1236-1247.
    2. Willis, Jay, 2008. "Simulation model of universal law of school size distribution applied to southern bluefin tuna (Thunnus maccoyii) in the Great Australian Bight," Ecological Modelling, Elsevier, vol. 213(1), pages 33-44.
    3. John M. Fryxell & Anna Mosser & Anthony R. E. Sinclair & Craig Packer, 2007. "Group formation stabilizes predator–prey dynamics," Nature, Nature, vol. 449(7165), pages 1041-1043, October.
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