TY - JOUR

T1 - "Trojan sparrows'

T2 - evolutionary consequences of dishonest invasion for the badges-of-status model

AU - Owens, I. P.F.

AU - Hartley, I. R.

PY - 1991/1/1

Y1 - 1991/1/1

N2 - An adapted game-theory model for the "badges of status' hypothesis is introduced, and factors influencing the formation of "honest' stable population states are investigated. The stability of these states is then studied when two "dishonest' mutant strategies, "cheat' and "Trojan sparrow', are evoked. The honest population states are stable against invasion by the cheat strategy if social control of deception, in the form of punishment from aggressive individuals, is sufficiently severe. The Trojan-sparrow strategy is successful for invading honest population states under all conditons, which indicates that the conventional badges-of-status model is fundamentally evolutionarily unstable in the absence of constraints limiting phenotypes to honesty. Without honest phenotypic limitation mixed fighting strategies should evolve but individuals will not display accurate information regarding their aggressive intent, and dominance hierarchies will be based on true measures of resource-holding potential and not badge size. Hence, the conventional badges-of-status theory can be reduced to the conventional hawk-dove model and cannot be used to explain the evolution of mixed fighting strategies without honest phenotype limitation. The authors identify the reproductive trade-off, honest "handicap', and/or genetic and/or pleiotropic constraints under which badges of status may prove evolutionarily stable by the limitation of the strategy set to honesty. -Authors

AB - An adapted game-theory model for the "badges of status' hypothesis is introduced, and factors influencing the formation of "honest' stable population states are investigated. The stability of these states is then studied when two "dishonest' mutant strategies, "cheat' and "Trojan sparrow', are evoked. The honest population states are stable against invasion by the cheat strategy if social control of deception, in the form of punishment from aggressive individuals, is sufficiently severe. The Trojan-sparrow strategy is successful for invading honest population states under all conditons, which indicates that the conventional badges-of-status model is fundamentally evolutionarily unstable in the absence of constraints limiting phenotypes to honesty. Without honest phenotypic limitation mixed fighting strategies should evolve but individuals will not display accurate information regarding their aggressive intent, and dominance hierarchies will be based on true measures of resource-holding potential and not badge size. Hence, the conventional badges-of-status theory can be reduced to the conventional hawk-dove model and cannot be used to explain the evolution of mixed fighting strategies without honest phenotype limitation. The authors identify the reproductive trade-off, honest "handicap', and/or genetic and/or pleiotropic constraints under which badges of status may prove evolutionarily stable by the limitation of the strategy set to honesty. -Authors

U2 - 10.1086/285277

DO - 10.1086/285277

M3 - Journal article

AN - SCOPUS:0026305564

VL - 138

SP - 1187

EP - 1205

JO - American Naturalist

JF - American Naturalist

SN - 0003-0147

IS - 5

ER -