Life history and the competitive environment: Trajectories of growth, maturation, and reproductive output among Chacma baboons
Life history and the competitive environment: Trajectories of growth, maturation, and reproductive output among Chacma baboons
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DOI：
10.1002/ajpa.10139
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发表时间：
2003-01-01
影响因子：
2.8
通讯作者：
Johnson, SE
中科院分区：
文献类型：
--
作者：
Johnson, SE
社会环境是影响灵长类生活史的关键因素。Chacma Baboons(Papio Hamadryas Ursins)是一种雌性结合的物种，具有严格的线性优势等级。在这个物种中，对生长和繁殖的竞争需求的能量分配被假设为随着竞争能力的变化而变化，而竞争能力又随着社会地位的提高而增加。由于增长速度是生活史模型的主要组成部分，因此使用特定年龄增长的衡量标准来分析不同社会阶层的生活史特征的差异。在没有镇静或诱饵的情况下，从博茨瓦纳奥卡万戈三角洲的一群习惯良好的Chacma狒狒身上获得了42只未成熟狒狒的体重。利用野生种群的人口统计和体重数据，得出了五个主要发现：1)婴儿和少年雌性的年龄体重和生长率与母亲的等级呈正相关。2)男性生长发育不受母体地位的影响。(3)雌性生长在不同饲养条件下的变异小于雄性生长。4)地位较低的成年雌性继续通过延长哺乳时间对后代进行投资，直到体重达到与地位较高的婴儿相当的体重。5)本研究表明，等级对繁殖成功的益处是增加0.83个后代。生殖跨度主要由成熟时的年龄决定，对不同等级的预期后代数量的差异贡献了27%-38%，而由于繁殖率的不同，贡献了62%-73%。这些发现对于理解社会环境在生活史特征的表型可塑性中的作用，以及在灵长类生活史的进化中具有重要意义。(C)2003年Wiley-Liss，Inc.
The social environment is a key feature influencing primate life histories. Chacma baboons (Papio hamadryas ursinus) are a female-bonded species with a strict linear dominance hierarchy. In this species, the allocation of energy to competing demands of growth and reproduction is hypothesized to vary as a function of competitive ability, which in turn increases with social rank. Since growth rate is a major component of life history models, measures of age-specific growth were used to analyze variation in life history traits across social ranks. Weights of 42 immature baboons were obtained without sedation or baiting from a troop of well-habituated chacma baboons in the Okavango Delta, Botswana. Using demographic and weight data from this wild population, five main findings emerged: 1) Weight for age and growth rate of infant and juvenile females are positively associated with maternal rank. 2) Male growth is not influenced by maternal rank. 3) Female growth shows smaller variation across feeding conditions than male growth. 4) Low-ranking adult females continue investment in offspring through prolonged lactation until they reach a weight comparable to that of high-ranking infants. 5) The benefit of rank to reproductive success shown in this study is 0.83 additional offspring. Reproductive span determined predominantly by age at maturation contributes 27-38% to the difference in expected number of offspring by rank, vs. 62-73% due to reproductive rate. These findings have major implications for understanding the role of social environment in phenotypic plasticity of life history traits, and in the evolution of primate life histories. (C) 2003 Wiley-Liss, Inc.