Pup production, sex ratios, and survivorship in African wild dogs, Lycaon pictus

J. Weldon McNutt, Joan B. Silk

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

The local resource enhancement (LRE) model predicts that in cooperatively breeding species, sex ratios will be biased in favor of the more helpful sex. In this study, we assess the assumptions underlying the LRE model in a population of cooperatively breeding wild dogs (Lycaon pictus) in Northern Botswana monitored over a 15-year period. In this population, litter size and pup survival to 1 year are strongly affected by pack size and the breeding female's age, but adult males have a stronger and more linear effect on females' reproductive performance than do adult females. This asymmetry in the benefits derived from male and female helpers is reflected in male-biased sex ratios in litters at the time pups emerge from the den. Sex ratio biases are most pronounced in the litters of the youngest mothers who live in significantly smaller packs than older females. The presence of potential rivals for the dominant female's position depresses pup production at the time of emergence, suggesting that competition among females for breeding positions may also contribute to the selective forces affecting birth sex ratios.

Original languageEnglish (US)
Pages (from-to)1061-1067
Number of pages7
JournalBehavioral Ecology and Sociobiology
Volume62
Issue number7
DOIs
StatePublished - May 1 2008
Externally publishedYes

Keywords

  • Cooperative breeding
  • Local resource competition
  • Local resource enhancement
  • Lycaon pictus
  • Sex ratio
  • Wild dogs

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

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