Evidence of kin-selected tolerance by nestlings in a siblicidal bird

  title={Evidence of kin-selected tolerance by nestlings in a siblicidal bird},
  author={D. John Anderson and Robert E. Ricklefs},
  journal={Behavioral Ecology and Sociobiology},
Behaviorally dominant members of blue-footed booby (Sula nebouxii) broods can effect siblicide by restricting access of subordinate siblings to parents providing food. In spite of their capacity for siblicide, dominant chicks permit subordinates to feed during short-term food shortage; in fact, the proportion of the food that the dominant takes is independent of the total amount delivered in older chicks. A model of optimal food distribution suggests that dominant chicks maximize their… 
Sibling Competition and the Evolution of Brood Size and Development Rate in Birds
Future studies of parent-offspring relationships should include evolutionary responses to competition between siblings and parental mechanisms for controlling these responses.
Begging Versus Aggression in Avian Broodmate Competition
Observations of boobies and diverse species suggest that aggression limits the effectiveness of begging by subordinate young by confining its timing, location or form.
Experimental manipulation of brood reduction and parental care in cooperatively breeding white-winged choughs
The hypothesis that choughs must breed in groups because they cannot provide enough food to nestlings without help is supported, as hatching asynchrony and behavioural control over brood reduction allow ch Doughs to maximize offspring production according to group size and food availability.
Desperado siblings: uncontrollably aggressive junior chicks
According to the desperado sibling hypothesis, chicks of obligately siblicidal species kill their junior broodmates as early as possible because junior broodmates face dire ecological prospects and
Costs of growing up as a subordinate sibling are passed to the next generation in blue‐footed boobies
Delayed costs to blue‐footed booby fledglings of junior status in the brood, which involves aggressive subordination, food deprivation and elevated corticosterone, are analysed to indicate that systematic competition‐related differences in developmental conditions of infant siblings can alter their reproductive value by affecting the viability of their eventual offspring.
Responsiveness to siblings’ need increases with age in vocally negotiating barn owl nestlings
It is shown here that older nestlings adjusted their vocal behavior more finely than younger nestlings in relation to the behavior of their siblings, suggesting that social adjustment changed with age in owlets, older ones being more sensitive to the signals of need of theiriblings.
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.
Brood Reduction in Neotropical Birds: Mechanisms, Patterns, and Insights from Studies in the Imperial Shag (Phalacrocorax atriceps)
  • W. Svagelj
  • Biology
    Behavioral Ecology of Neotropical Birds
  • 2019
Several hypotheses accounting for the adaptive value of brood reduction are summarized and an integrative approach analyzing brood reduction in Imperial Shags (Phalacrocorax atriceps) is presented to illustrate causes, consequences, and benefits of this breeding strategy.
Sibling competition and cooperation over parental care
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


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.
Brood reduction in the American white pelican (Pelecanus erythrohynchos)
Results support the hypothesis that the second egg functions as a form of “insurance” against early loss of the first egg or chick, and reveal that the presence of a second chick contributes significantly to the reproductive success of the parents.
Estimates of inclusive fitness of chicks in experimental broods were higher than were those of control nestlings, a result inconsistent with the POC hypothesis that the siblicidal offspring's optimal brood size is one while the parents' optimum is greater than one.
Estimates of inclusive fitness of chicks in experimental broods were higher than were those of control nestlings, a result inconsistent with the POC hypothesis that the siblicidal offspring's optimal brood size is one while the parents' optimum is greater than one.
The role of hatching asynchrony in siblicidal brood reduction of two booby species
Experimental shortening of masked boobies demonstrated that this species maintians its HA above an “early reduction threshold”, below which parents may incur costs of provisioning a brood that they cannot raise to fledging, but that blue-footed booby HA occur above, at, and below the masked booby threshold.
Avian Breeding Adaptations: Hatching Asynchrony, Brood Reduction, and Nest Failure
Using a simply model of the effect of total nest failure on optimal asynchrony, it is predicted that, even in the absence of brood reduction, most bird species should commence incubation before the last egg is laid.
Hatching Asynchrony in Altricial Birds: Nest Failure and Adult Survival
These nest-failure models are modified to show that predation on adults at the nest, and adult survival between nesting attempts, may also influence optimal hatching asynchrony.
Evolution of Obligate Siblicide in Boobies. 1. A Test of the Insurance-Egg Hypothesis
A field study of the obligately siblicidal masked booby demonstrated that second eggs contribute a surviving hatchling after the first egg's failure in 19.2% of two-egg clutches.
Asynchronous hatching in the laughing gull: Cutting losses and reducing rivalry