Population trend alters the effects of maternal dominance rank on lifetime reproductive success in yellow baboons (Papio cynocephalus)

Wasser, Samuel K.; Norton, Guy W.; Kleindorfer, Sonia; Rhine, Ramon J.

doi:10.1007/s00265-004-0797-2

Cited by 40 publications

(32 citation statements)

References 23 publications

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“…This study has provided the first assessment of variance in LRS among female mountain gorillas, and one of the few such assessments for any nonhuman primate (but see Fedigan et al, 1986;Wasser et al, 2004, and references in Table 4). Despite poaching deaths, adult females produced an average of 1.6 adult female offspring during their lifetime, which indicates a growing population that contrasts with most other great apes (e.g., Sugiyama, 1994;Hill et al, 2001).…”

Section: Discussion Lifetime Fitness and Its Variancementioning

confidence: 99%

“…Despite the importance of LRS and k ind for studies of evolutionary biology and population dynamics, relatively few direct measurements are available for long-lived species, especially nonhuman primates (Rhine et al, 2000;Wasser et al, 2004). The lack of data reflects the challenges of tracking individuals in long-term studies, especially when those individuals disperse (e.g., Alberts and Altmann, 1995).…”

mentioning

confidence: 98%

“…The standardized variance (variance/ mean 2 ) in fitness has been defined as the ''opportunity for selection,'' which reflects an upper limit on the rate of evolution (Crow, 1958;Shuster and Wade, 2003). Variance in fitness can also arise from environmental fluctuations or by chance (Sutherland, 1985(Sutherland, , 1987Coltman et al, 1999;Forcada et al, 2008).Lifetime reproductive success (LRS) is a commonly used measure of individual fitness (Barrowclough and Rockwell, 1993;van Noordwijk and van Schaik, 1999;Rhine et al, 2000;Wasser et al, 2004). The LRS of a female equals the total number of surviving offspring that she produces in her lifetime.…”

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confidence: 99%

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Lifetime reproductive success of female mountain gorillas

Robbins

Stoinski

Fawcett

et al. 2011

Am. J. Phys. Anthropol.

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Studies of lifetime reproductive success (LRS) are important for understanding population dynamics and life history strategies, yet relatively little information is available for long-lived species. This study provides a preliminary assessment of LRS among female mountain gorillas in the Virunga volcanoes region. Adult females produced an average of 3.6 ± 2.1 surviving offspring during their lifetime, which indicates a growing population that contrasts with most other great apes. The standardized variance in LRS (variance/mean(2) = 0.34) was lower than many other mammals and birds. When we excluded the most apparent source of environmental variability (poaching), the average LRS increased to 4.3 ± 1.8 and the standardized variance dropped in half. Adult lifespan was a greater source of variance in LRS than fertility or offspring survival. Females with higher LRS had significantly longer adult lifespans and higher dominance ranks. Results for LRS were similar to another standard fitness measurement, the individually estimated finite rate of increase (λ(ind) ), but λ(ind) showed diminishing benefits for greater longevity.

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Section: Discussion Lifetime Fitness and Its Variancementioning

confidence: 99%

mentioning

confidence: 98%

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confidence: 99%

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Lifetime reproductive success of female mountain gorillas

Robbins

Stoinski

Fawcett

et al. 2011

Am. J. Phys. Anthropol.

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“…Maternal rank affects both growth rates and age at sexual maturation of the Amboseli males and females [Altmann & Alberts, 2003, 2005Alberts & Altmann, 1995b;Altmann et al, 1988], and has similar effects in a number of other populations [Bercovitch & Strum, 1993;Johnson, 2003;Wasser et al, 2004]. Moreover, maternal rank has been shown to correlate with serum T levels of captive adolescent sons in rhesus monkeys .…”

Section: Sources Of Variability In Juvenile Hormone Concentrationsmentioning

confidence: 92%

Coming of age: steroid hormones of wild immature baboons (Papio cynocephalus)

Gesquiere

Altmann

Khan

et al. 2005

American J Primatol

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Large gaps exist in our knowledge about common patterns and variability in the endocrinology of immature nonhuman primates, and even normal hormonal profiles during that life stage are lacking for wild populations. In the present study we present steroid profiles for a wild population of baboons (Papio cynocephalus) from infancy through reproductive maturation, obtained by noninvasive fecal analyses. Fecal concentrations of glucocorticoid (fGC) and testosterone (fT) metabolites for males, and of fGC, estrogen (fE), and progestin (fP) metabolites for females were measured by radioimmunoassay (RIA). In males, infancy was characterized by high and declining levels of fGC and fT, whereas steroid concentrations were low during the juvenile years. During the months immediately prior to testicular enlargement, fT (but not fGC) concentration tended to increase. Males that matured early consistently had higher fT and fGC concentrations than those that matured late, but not significantly so at any age. Individual differences in fT concentrations were stable across ages, and average individual fT and fGC concentrations were positively correlated. For females, high and declining levels of fE characterized infancy, and values increased again after 3.5 years of age, as some females reached menarche by that age. Both fP and fGC were relatively low and constant throughout infancy and the juvenile period. During the months immediately prior to menarche, fGC concentration significantly decreased, while no changes were observed for fE levels. fP exhibited a complicated pattern of decrease that was subsequently followed by a more modest and nonsignificant increase as menarche approached. Early- (EM) and late-maturing (LM) females differed only in fP concentration; the higher fP concentrations in EM females reached significance at 4-4.5 years of age. Maternal rank at offspring conception did not predict concentrations of any hormone for either sex. Our results demonstrate the presence of individual endocrine variability, which could have important consequences for the timing of sexual maturation and subsequently for individual reproductive success. Further evaluation of the factors that affect hormone concentrations during the juvenile and adolescent periods should lead to a better understanding of mechanisms of life-history variability.

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“…This result is surprising because Amboseli represents a relatively harsh environment for baboons, and prior work in Amboseli has found persistent effects of female rank on fertility and age at maturity [76,77]. In addition, high rank is associated with survival benefits for female baboons in Mikumi, Tanzania and in the Okavango Delta in Botswana [12,78]. We interpret the lack of an effect of rank on female survival in Amboseli with caution because female rank and social connectedness are both, of course, estimated with some error.…”

Section: (B) Social and Demographic Predictors Of Social Connectednessmentioning

confidence: 99%

Social affiliation matters: both same-sex and opposite-sex relationships predict survival in wild female baboons

et al. 2014

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Social integration and support can have profound effects on human survival. The extent of this phenomenon in non-human animals is largely unknown, but such knowledge is important to understanding the evolution of both lifespan and sociality. Here, we report evidence that levels of affiliative social behaviour (i.e. 'social connectedness') with both same-sex and opposite-sex conspecifics predict adult survival in wild female baboons. In the Amboseli ecosystem in Kenya, adult female baboons that were socially connected to either adult males or adult females lived longer than females who were socially isolated from both sexes-females with strong connectedness to individuals of both sexes lived the longest. Female social connectedness to males was predicted by high dominance rank, indicating that males are a limited resource for females, and females compete for access to male social partners. To date, only a handful of animal studies have found that social relationships may affect survival. This study extends those findings by examining relationships to both sexes in by far the largest dataset yet examined for any animal. Our results support the idea that social effects on survival are evolutionarily conserved in social mammals.

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Population trend alters the effects of maternal dominance rank on lifetime reproductive success in yellow baboons (Papio cynocephalus)

Cited by 40 publications

References 23 publications

Lifetime reproductive success of female mountain gorillas

Lifetime reproductive success of female mountain gorillas

Coming of age: steroid hormones of wild immature baboons (Papio cynocephalus)

Social affiliation matters: both same-sex and opposite-sex relationships predict survival in wild female baboons

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