A game-theoretical model of kleptoparasitic behavior in an urban gull (Laridae) population

Article


Spencer, R. and Broom, M. 2018. A game-theoretical model of kleptoparasitic behavior in an urban gull (Laridae) population. Behavioral Ecology. 29 (1), pp. 60-78. https://doi.org/10.1093/beheco/arx125
TypeArticle
TitleA game-theoretical model of kleptoparasitic behavior in an urban gull (Laridae) population
AuthorsSpencer, R. and Broom, M.
Abstract

Kleptoparasitism (food stealing) is a significant behavior for animals that forage in social groups as it permits some individuals to obtain resources while avoiding the costs of searching for their own food. Evolutionary game theory has been used to model kleptoparasitism, with a series of differential equation-based compartmental models providing significant theoretical insights into behavior in kleptoparasitic populations. In this paper, we apply this compartmental modeling approach to kleptoparasitic behavior in a real foraging population of urban gulls (Laridae). Field data was collected on kleptoparasitism and a model developed that incorporated the same kleptoparasitic and defensive strategies available to the study population. Two analyses were conducted: 1) An assessment of whether the density of each behavior in the population was at an equilibrium. 2) An investigation of whether individual foragers were using Evolutionarily Stable Strategies in the correct environmental conditions. The results showed the density of different behaviors in the population could be at an equilibrium at plausible values for handling time and fight duration. Individual foragers used aggressive kleptoparasitic strategies effectively in the correct environmental conditions but some individuals in those same conditions failed to defend food items. This was attributed to the population being composed of 3 species that differed in competitive ability. These competitive differences influenced the strategies that individuals were able to use. Rather than gulls making poor behavioral decisions these results suggest a more complex 3-species model is required to describe the behavior of this population.

LanguageEnglish
PublisherOxford University Press (OUP)
JournalBehavioral Ecology
ISSN1045-2249
Electronic1465-7279
Publication dates
Online17 Oct 2017
Print13 Jan 2018
Publication process dates
Deposited01 Feb 2018
Accepted08 Sep 2017
Output statusPublished
Accepted author manuscript
Copyright Statement

This is a pre-copyedited, author-produced version of an article accepted for publication in Behavioral Ecology following peer review. The version of record Robert Spencer, Mark Broom; A game-theoretical model of kleptoparasitic behavior in an urban gull (Laridae) population, Behavioral Ecology, Volume 29, Issue 1, January/February 2018, Pages 60–78, is available online at: https://doi.org/10.1093/beheco/arx125

Digital Object Identifier (DOI)https://doi.org/10.1093/beheco/arx125
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https://repository.mdx.ac.uk/item/876z2

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