Reproductive strategies of the orang-utan: New data and a reconsideration of existing sociosexual models

@article{Schrmann2007ReproductiveSO,
  title={Reproductive strategies of the orang-utan: New data and a reconsideration of existing sociosexual models},
  author={Chris L. Sch{\"u}rmann and Jan A.R.A.M. van Hooff},
  journal={International Journal of Primatology},
  year={2007},
  volume={7},
  pages={265-287}
}
Recent field data indicate that MacKinnon’s model of the orang-utan’s sexual and agonistic activity needs to be revised. In this model, male reproductive activity is concentrated in an extended phase of subadulthood and in early adulthood. According to this model, the role of older adult males is primarily that of range guardian, and in that role they would ensure that the offspring they had generated earlier would have safe access to food resources. This study presents cases suggesting that… Expand

Figures from this paper

Sociosexual behavioral patterns involving nulliparous female orangutans (Pongo sp.) reflect unique challenges during the adolescent period
TLDR
It is proposed that adolescent female orangutans display distinctive behavioral repertoires throughout the genus Pongo which serves to overcome male ambivalence toward nulliparous females, establish familiarity, and evaluate coercive tendencies in flanged males. Expand
Female reproductive strategies in orangutans, evidence for female choice and counterstrategies to infanticide in a species with frequent sexual coercion
TLDR
The results support the hypothesis that, together with concealed ovulation, facultative association is a mechanism of female choice in a species in which females can rarely avoid coercive mating attempts and female resistance, which reduced copulation time, may provide an additional mechanism for mate selection. Expand
The efficacy of female choice in chimpanzees of the Taï Forest, Côte d’Ivoire
TLDR
The results indicate that females could effectively resist male solicitations and, in most cases, unwanted copulations were averted, suggesting that females were effective in their mate choice and that, despite clear male dominance, female choice influences paternity in wild chimpanzees. Expand
The cost of associating with males for Bornean and Sumatran female orangutans: a hidden form of sexual conflict?
TLDR
It is found that the cost of association, in terms of reduced feeding to moving ratio and increased time being active, is higher in the less sociable Bornean population, at least at Tuanan, and association maintenance qualifies as another expression of sexual conflict in orangutans. Expand
A Comparison of Female Mating Strategies in Pan troglodytes and Pongo spp.
TLDR
Analysis of mating patterns in orangutans and chimpanzees concludes that both genera pursue tactics for paternity confusion by mating with multiple males and by mating cooperatively or even proceptively with nonpreferred partners when conception is unlikely. Expand
Low Testosterone Correlates with Delayed Development in Male Orangutans
TLDR
While androgen variation had previously been viewed as a state-dependent characteristic of male developmental status, this study reveals that differences in the physiology of early and late developing males are detectable long past the developmental transition and may instead be trait-level characteristics associated with a male’s life history strategy. Expand
The orang-utan mating system and the unflanged male: A product of increased food stress during the late Miocene and Pliocene?
TLDR
Evidence indicates that the orang-utan's present-day mating system most likely evolved from a gorilla-like base, with one dominant male guarding a harem of females, which implies that the ancestral hominoid probably had a social and mating system more similar to the gorilla than any other living ape. Expand
The development of wild immature Sumatran orangutans (Pongo abelii) at Ketambe
TLDR
The results indicate that immature orangutans can provide for their own food and transport, and therefore were independent of direct maternal care, and refutes the slow life history hypothesis and corroborates the results obtained with the Sumatran orangutan population at Suaq Balimbing. Expand
Male orang-utan bimaturism and reproductive success at Camp Leakey in Tanjung Puting National Park, Indonesia
TLDR
It is concluded that orang-utan male bimaturism is consistent with an evolutionarily stable reproductive strategy and that reproduction within the range of a dominant, flanged male is highly skewed in his favour, while unflanged males may largely wait for reproductive opportunities. Expand
Sexual Conflict in Nonhuman Primates
TLDR
Evidence for sexually antagonistic coevolution as a third force of sexual selection in nonhuman primates is reviewed, finding indications that the former may be expressed relatively more often in the nongregarious strepsirrhines and the latter among group-living haplorrhines. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 39 REFERENCES
Reproductive behaviour of wild chimpanzees in the Gombe National Park, Tanzania.
  • C. Tutin
  • Biology, Medicine
  • Journal of reproduction and fertility. Supplement
  • 1980
TLDR
Developmental and demographic data from observations for 19 years show that female chimpanzees have a very limited reproductive potential and the most dominant male was the only male able to monopolize oestrous females by showing possessiveness. Expand
Courtship and Mating Behavior of Wild Orangutans in Sumatra
TLDR
A qualitative account of the courtship and mating behavior of the orangutan in Ketambe in the Gunung Leuser Reserve in Sumatra. Expand
The Evolution of Concealed Ovulation
TLDR
The hypothesis presented here is that the phenomenon occurs because of a hominid female tendency to avoid conception in biologically nonadaptive ways, countered by natural selection by making ovulation virtually undetectable to women. Expand
Scaling of sexual dimorphism in body size and breeding system in primates
TLDR
It is argued here that there is a strong relationship between polygyny and positive allometry for sexual dimorphism in body size, and this evidence is based on an analysis of the relationship between the scaling of sexualDimorphisms in body weight and the breeding system for 53 primate species, which in most cases coincide with those chosen by Clutton-Brock et al.4 for their study. Expand
On the Ultimate Causes of Primate Social Systems
TLDR
Comparison evidence indicates that the distinction between a single-male or a multi-male system is ultimately dependent on the varying ability of a male to monopolize access to a breeding group of females. Expand
Sexual selection and natural selection in bird speciation
TLDR
It is concluded that perhaps the main role for sexual selection in speciation is in generating differences between populations in traits, and sexual selection is likely to have an important role in generating premating isolating mechanisms throughout an adaptive radiation. Expand
The behaviour and ecology of wild orang-utans (Pongo pygmaeus)
TLDR
Comparison between several populations revealed an interesting mechanisms for the natural regulation of animal numbers and differences between Bornean and Sumatran orang-utans are discussed in relation to the zoogeography of these two islands. Expand
Relationship of sexual dimorphism in canine size and body size to social, behavioral, and ecological correlates in anthropoid primates
TLDR
The degree of canine size dimorphism is closely related to the amount of male intrasexual selection in a given mating system; and the degree of body sizeDimorphism may be modified by selection pressure from factors such as habitat, diet, foraging behavior, antipredator behavior, locomotory behavior, and female preference. Expand
Parental investment and sexual selection
Charles Darwin's (1871) treatnent of the topic of sexual selection was sometinrcs confused because he lackcd a gcneral framework within which to relate the variables he perceived to bc important:Expand
Sexual dimorphism, socionomic sex ratio and body weight in primates
TLDR
An investigation of the relationship between the degree of sexual dimorphism and three variables which are predicted might affect it is described. Expand
...
1
2
3
4
...