Reproductive success of two male morphs in a free-ranging population of Bornean orangutans

Tomoyuki Tajima, Titol P. Malim, Eiji Inoue

Research output: Contribution to journalArticle

Abstract

The reproductive success of male primates is not always associated with dominance status. For example, even though male orangutans exhibit intra-sexual dimorphism and clear dominance relationships exist among males, previous studies have reported that both morphs are able to sire offspring. The present study aimed to compare the reproductive success of two male morphs, and to determine whether unflanged males sired offspring in a free-ranging population of Bornean orangutans, using 12 microsatellite loci to determine the paternity of eight infants. A single flanged male sired most of the offspring from parous females, and an unflanged male sired a firstborn. This is consistent with our observation that the dominant flanged male showed little interest in nulliparous females, whereas the unflanged males frequently mated with them. This suggests that the dominant flanged male monopolizes the fertilization of parous females and that unflanged males take advantage of any mating opportunities that arise in the absence of the flanged male, even though the conception probability of nulliparous females is relatively low.

Original languageEnglish
Pages (from-to)127-133
Number of pages7
JournalPrimates
Volume59
Issue number2
DOIs
Publication statusPublished - Mar 1 2018
Externally publishedYes

Fingerprint

Pongo pygmaeus
morphs
dominance (genetics)
reproductive success
fertilization (reproduction)
paternity
sexual dimorphism
sires
Primates

Keywords

  • Bimaturism
  • Bornean orangutan
  • Free-ranging population
  • Male dominance
  • Paternity analysis
  • Pongo pygmaeus

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

Reproductive success of two male morphs in a free-ranging population of Bornean orangutans. / Tajima, Tomoyuki; Malim, Titol P.; Inoue, Eiji.

In: Primates, Vol. 59, No. 2, 01.03.2018, p. 127-133.

Research output: Contribution to journalArticle

Tajima, Tomoyuki ; Malim, Titol P. ; Inoue, Eiji. / Reproductive success of two male morphs in a free-ranging population of Bornean orangutans. In: Primates. 2018 ; Vol. 59, No. 2. pp. 127-133.
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