No reduction in aggression after loss of a broodmate: a test of the brood size hypothesis

  title={No reduction in aggression after loss of a broodmate: a test of the brood size hypothesis},
  author={Hugh Drummond and Cristina Rodr{\'i}guez},
  journal={Behavioral Ecology and Sociobiology},
In some vertebrate species, parents create a large brood or litter then, in the event of unfavourable ecological conditions, apparently allow the number of offspring to be adaptively reduced through siblicide. But how is sibling aggression regulated so that deaths occur only in unfavourable conditions? One proposed mechanism is brood size-dependent aggression. Two experiments tested for this mechanism by reducing three-chick broods of blue-footed boobies either during or after the period of… 
Sibling aggression and brood reduction: a review
It is concluded that more aspects must be considered in the design of future studies in order to understand the potential evolutionary sense of aggressive behaviour among siblings, especially those concerning food allocation decisions by parents.
Broodmate aggression and life history variation in accipitrid birds of prey
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Until the 1960s and 1970s, evolutionary biologistsenvisioned family interactions as harmonious, withparents maximizing the number of surviving off-spring (Lack 1947). However, after the developmentof
Comportamiento Agresivo Entre Polluelos de Pelecanus Occidentalis Murphyi (Aves: Pelecanidae) en el Parque Nacional Natural Gorgona: Relación con Etapas Tempranas de Desarrollo, Tamaño de Nidada y Alimentación
En muchas especies de aves nidicolas los hermanos compiten agresivamente por el alimento. En el pelicano comun este comportamiento lleva en ocasiones al fratricidio y es determinante para la


The Role of Brood Size in Regulating Egret Sibling Aggression
It is proposed that species probably do best by relying on current food amount for the truncation of sibling fighting whenever that cue allows an accurate assessment of pending competition, with brood size used mainly as an alternative or backup system.
The function of hatching asynchrony in the blue-footed booby
The results suggest that natural asynchrony makes brood reduction more efficient and decreases the costs of sibling aggression to parents, in terms of their future survival or fecundity, as proposed by Mock and Ploger (1987).
A revaluation of the role of food in broodmate aggression
There is no convincing evidence that the prey size hypothesis can explain variation among species or during development, and studies showing that heron chicks are more aggressive when prey are small are inconclusive because they did not exclude food deprivation as an alternative explanation.
The control and function of agonism in avian broodmates
Buffered Development: Resilience after Aggressive Subordination in Infancy
Exercising dominance throughout infancy apparently does not fortify a chick for the future and may incur a long‐term cost, and suffering violent subordination throughout infancy has little or no prejudicial effect and may even steel a chicks for adult life.
Does brood reduction provide nestling survivors with a food bonus?
To test the assumption that parental deliveries of food remain constant, and to determine how brood reduction affected seniors, food deliveries to control and experimentally reduced broods of brown pelicans were compared.
Dominance in Vertebrate Broods and Litters
  • H. Drummond
  • Biology, Psychology
    The Quarterly Review of Biology
  • 2006
An evolutionary framework in which the species‐typical dominance relationship is determined by feeding mode, confinement, cost of subordination, and capacity for individual recognition, can be extended to mammalian litters and account for the aggression‐submission and aggression‐resistance observed in distinct populations of spotted hyenas.
Parent-offspring cooperation in the blue-footed boody (Sula nebouxii): social roles in infanticial brood reduction
Reproduction in the blue-footed boody was examined for evidence of parent-offspring conflict over infanticidal reduction of the brood, and provisional tolerance of the junior chick by its underweight senior sib is consistent with “self-sacrifice” to increase the latter's inclusive fitness.
Training siblings to be submissive losers: dominance between booby nestlings