Non-Monogamous Copulations and Potential Within-Group Mating Competition in White-Faced Saki Monkeys (Pithecia pithecia)

2013 ◽  
Vol 75 (8) ◽  
pp. 817-824 ◽  
Author(s):  
CYNTHIA L. THOMPSON
Keyword(s):  
Mating Competition ◽  
Pithecia Pithecia

scholarly journals The dark-ventral-patch of male red deer, a sexual signal that conveys the degree of involvement in rutting behavior

BMC Zoology ◽  
2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Eva de la Peña ◽  
Javier Pérez-González ◽  
José Martín ◽  
Giovanni Vedel ◽  
Juan Carranza
Keyword(s):  
Sexual Behaviors ◽  
Red Deer ◽  
Decisive Role ◽  
Female Mate Choice ◽  
Doñana National Park ◽  
Sexual Signal ◽  
Mating Competition ◽  
Dark Patch ◽  
Rutting Behavior

Abstract Background In polygynous mammals, signalling may play a decisive role in mating behavior, mediating the intensity of male fights and female mate choice. During the rutting season, male red deer may show a visible dark patch in their ventral fur. Recently, this patch has been suggested to act as a flexible sexual signal, due to its relationships with other variables such as age, body size, antler development, volatile compounds, or the competitive environment. The analysis of fur pigmentation at the ventral patch suggests that this might also visually indicate the male intrinsic predisposition to take part in mating competition. Results To assess the possible role of this trait as a communicative signal related to mate competition, we used red deer behavioral observations during the rut in Doñana National Park (Spain) to examine the link between the degree of expression of the dark ventral patch and the rutting activity (assessed from both intra-and-inter-sexual behaviors). Consistent with our predictions, we found in a field study that males with large dark patches showed a higher frequency of rutting behaviors (mainly roaring and flehmen), more interactions with females, and attained larger harem sizes. Conclusions The dark ventral patch was a better predictor of male behavior than antler tines or territory holding, thus standing as a short-term indicator of male willingness to invest in mating competition.

4. Sex roles and stereotypes

2018 ◽  
pp. 52-68
Author(s):  
Leigh W. Simmons
Keyword(s):  
Sexual Selection ◽  
Mate Choice ◽  
Sexual Behaviour ◽  
Sex Roles ◽  
Animal Species ◽  
Male And Female ◽  
Mating Competition ◽  
Characteristic Behaviour ◽  
Males And Females ◽  
Female Roles

‘Sex roles and stereotypes’ examines the notion, implicit in many of the original ideas about sexual selection, that males and females have natural ‘roles’ with characteristic behaviour associated with each sex. It also explores further the reasons behind deviations from the ‘typical’ sex roles in mate choice and in mating competition. Are there ‘standard’ male and female roles in both humans and other animal species? One version of sex roles holds that males are generally dominant and females submissive, stemming from the way that sexual selection favours different behaviours in each sex. This could mean that sexual selection dictates particular behaviours in males and females. But in fact, sexual behaviour is extraordinarily varied in nature.

scholarly journals Primate populations in continuous forest and forest fragments in Central Amazonia

1988 ◽  
Vol 18 (3-4) ◽  
pp. 291-307 ◽  
Author(s):  
Anthony B. Rylands ◽  
Alexine Keuroghlian
Keyword(s):  
Food Sources ◽  
Primate Species ◽  
Forest Fragments ◽  
The Past ◽  
Pithecia Pithecia ◽  
Ateles Paniscus ◽  
Continuous Forest ◽  
Second Growth ◽  
Central Amazonia ◽  
One Year

Population densities of six primate species (Saguinus midas, Pithecia pithecia, Cebus apella, Chiropotes satanas, Alouatta seniculus and Ateles paniscus) were estimated in continuous forest and in isolated reserves (one of 100 ha and four of 10 ha). Saguinusdensities in the continuous forest were found to be low, probably due to the lack of edge habitat and second growth favoured by them; Pithecia, Cebus and Ateles populations are also low, possibly because of more widely distributed and/or less abundant food sources than is true for other Amazonian regions, although hunting in the past, particularly of Ateles may also be a contributing factor; and Chiropotes and Alouatta densities were found to be similar to those observed in other areas of Amazonas forests. Ateles and Chiropotes, which occupy ranges on the order of three km2 were excluded from the 100-ka reserve at the time of its isolation. Unfortunately populations were not known prior to isolation of this reserve but during isolation there remained four groups of Saguinus, two Pitheciagroups, one Cebus groups and five Alouatta groups. One Saguinus group disappeared two months later, and one year post-isolation the Cebus group also left the reserve. Single Alouatta groups survive in the isolated 10-ha reserves. Saguinus, present in the four 10-ha reserves following isolation, have disappeared from two of them. One 10-ha reserve retains a group of Pithecia.

Digesta passage and fiber digestibility in captive white-faced sakis (Pithecia pithecia)

2002 ◽  
Vol 58 (1) ◽  
pp. 23-34 ◽  
Author(s):  
Marilyn A. Norconk ◽  
Olav T. Oftedal ◽  
Michael L. POWER ◽  
Michael JAKUBASZ ◽  
Anne Savage
Keyword(s):  
Pithecia Pithecia ◽  
Fiber Digestibility ◽  
Digesta Passage

Can male white-faced saki monkeys (Pithecia pithecia) detect female reproductive state?

Behaviour ◽  
2011 ◽  
Vol 148 (11-13) ◽  
pp. 1310-1328 ◽  
Author(s):  
C.L. Thompson ◽  
P.L. Whitten ◽  
M.A. Norconk
Keyword(s):  
Sexual Behavior ◽  
Reproductive Success ◽  
Mate Choice ◽  
Sexual Experience ◽  
Social Groups ◽  
Hormonal Status ◽  
Reproductive State ◽  
Pregnant Females ◽  
Pithecia Pithecia ◽  
Female Dyad

Abstract For mammalian males, copulating with females during ovulation is critical to reproductive success. However male knowledge of ovulation may not always be advantageous for females, as it could hinder mate choice or promote harassment. White-faced saki monkeys live in variably monogamous and polygamous social groups and hence females may have multiple motivations to conceal ovulatory timing. White-faced sakis further show no obvious physical or behavioral signs of ovulation, although they do use scent in a variety of contexts, including sexual behavior. We collected data on three wild groups of white-faced sakis at Brownsberg Naturepark, Suriname in order to assess whether male copulations are coordinated with female ovulatory timing. We recorded all occurrences of copulations and genital inspections, and collected fecal samples from females which were radioimmunoassayed to obtain estradiol and progesterone levels. We found that males copulated throughout the female reproductive cycle, although the association between copulation and reproductive state varied between dyads. Only one male–female dyad showed significantly more copulations than expected during ovulation. However four of five dyads copulated less than expected with pregnant females, suggesting that males may be able to differentiate cycling from non-cycling females. While genital inspections were distributed randomly with regard to female reproductive state, the decision to copulate was not: males were more likely to mate with both ovulating and cycling females than with non-cycling females after genital inspection. Regardless, males were not more likely to copulate with an ovulating vs. a cycling (non-ovulating) female. These data indicate that while males may receive olfactory information on female hormonal status, they do not make entirely accurate decisions with regard to copulation timing. This inaccuracy may be due to males' inability to detect ovulation, or alternately a lack of motivation to limit copulations solely to conceptive periods. Pair familiarity and sexual experience may also play a role in copulation accuracy.

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