Producers and scroungers: A general model and its application to captive flocks of house sparrows

  title={Producers and scroungers: A general model and its application to captive flocks of house sparrows},
  author={Christopher J. Barnard and Richard M. Sibly},
  journal={Animal Behaviour},
Producers, Scroungers, and Group Foraging
A model that reconciles information-sharing and producer-scrounger models of group foraging and an opportunistic forager that can both produce and scrounge but with reduced efficiency is developed.
Producers, scroungers and the price of a free meal
A model of social foraging acknowledging the finder's advantage and foraging role asymmetries among individuals but incorporating the possibility that producers and scroungers differ in vigilance level and in vulnerability to predators is presented, allowing simultaneous examination of both foraging benefits and anti-predatory aspects of grouping behaviour.
Early experience affects producer–scrounger foraging tendencies in the house sparrow
Effects of ecology and prey characteristics on the use of alternative social foraging tactics in crows, Corvus caurinus
  • R. Ha, J. Ha
  • Environmental Science
    Animal Behaviour
  • 2003
The producer–scrounger model assumes that producers are animals that search for food, and scroungers are animals that steal food found by producers. By following foraging decisions made by
A test of the producer-scrounger foraging game in captive flocks of spice finches, Loncbura punctulata
It is suggested that spice finches can alter their allocation to each foraging alternative by experience and that the producer-scrounger game is a realistic model for predicting group foraging decisions.
A field investigation of scrounging in semipalmated sandpipers
  • G. Beauchamp
  • Environmental Science
    Behavioral Ecology and Sociobiology
  • 2014
The results show unequal payoffs for producing and scrounging in this system and suggest that low success in finding patches elicited scrounge, a measure of foraging payoffs.
Phenotypic Correlates of Scrounging Behavior in Zebra Finches: Role of Foraging Efficiency and Dominance
A link between boldness, foraging efficiency and the choice of foraging tactics in small flocks of zebra finches is suggested, suggesting that birds that arrived later on the foraging grid foraged less efficiently when scrounging was prevented and used scounging to a greater extent when allowed.
Zebra finches in poor condition produce more and consume more food in a producer–scrounger game
This study assessed the influence of natural variation in body condition on the differential use of social foraging tactics and their resulting payoffs in zebra finches and found the producer tactic was found to yield more consistent and predictable rewards across trials than the scrounger tactic.
Patch exploitation in a producer-scrounger system: test of a hypothesis using flocks of spice finches (Lonchura punctulata)
An extension of the marginal value theorem of patch exploitation that includes the producer-scrounger dynamics is developed and the results show that the producers of a patch often leave as scroungers join their food discoveries because the payoffs from leaving exceed those from staying.


Foraging Behavior of the Starling (Sturnus vulgaris) in Maryland
A study designed to provide baseline information on the foraging behaviors of this species throughout a year, as well as a more detailed analysis of foraging strategies of Starling flocks under various environmental conditions, and introduces a technique, the fixed grid, which appears generally useful for delineating the foragers of open-ground feeders.
The Food Searching Behaviour of Two European Thrushes. Ii: the Adaptiveness of the Search Patterns
Although there were suggestions of differing capture rates, unforeseen errors in experimental procedure did not allow firm conclusions on the effects of thrush predation on the different prey distributions within each density, it is suggested that the increases in move lengths were an adaptive reaction by the blackbirds to increases in prey detectability.
Kleptoparasitism in birds
The Food Searching Behaviour of Two European Thrushes
1. The movement path of a predator will clearly be an important determinant of its ability to encounter and subsequently attack suitable prey items. Previous work on this aspect of searching
Feeding rates, search paths, and surveillance for predators in great-tailed grackle flocks
Although they were not strongly influenced by flocking, feeding and search behaviour of grackle was strongly affected by the sex of the grackles, the season, and the local feeding area, and grackle feeding behaviour seemed less closely adjusted to flocking than to other environmental factors.
Geometry for the selfish herd.
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  • Environmental Science
    Journal of theoretical biology
  • 1971
Relative Fecundity and Parental Effort in Communally Nesting Anis, Crotophaga sulcirostris
The amount of parental care performed by each bird is correlated with relative egg ownership for both sexes and the contribution of eggs to the communal clutch by females of the group is significantly skewed.
The concept of social dominance.
The theory of games and the evolution of animal conflicts.
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  • Psychology
    Journal of theoretical biology
  • 1974