And Baby Makes Three: Postpartum Changes in Male–Female Affiliative Interactions in White-Faced Capuchins

IF 2 3区 生物学 Q1 ZOOLOGY
Katharine M. Jack, Nelle K. Kulick, Valérie A.M. Schoof, Eva C. Wikberg, Shoji Kawamura, Linda M. Fedigan
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Abstract

In group-living primates, male investment in infants is highly variable. Previous research on polygynandrous primates found that male care of infants, whether direct or indirect, may be a means to increase offspring survival, increase social status, invest in future mating opportunities, and/or invest in future social or coalition partners, any of which may increase fitness outcomes. Relationships between male white-faced capuchins (Cebus imitator) and infants are highly variable, ranging from neutral to highly affiliative during periods of group stability to lethal during times of instability. We used genetic paternity analysis and behavioral observations to investigate the impact of paternity status, female dominance rank, male dominance rank, and infant sex on changes in rates of affiliation (contact and proximity) between capuchin males and females following the birth of an infant (n = 92 dyads). We used generalized linear mixed models and an information theory approach to select models for averaging. We found that overall rates of male-female affiliation increased following the birth of an infant (contact change: +1.09 ± 2.55%; proximity change: +1.16 ± 3.08%). Infant sex was the only significant explanatory variable; dyads that included males and females who gave birth to male infants experienced a significant increase in their time in contact and proximity in comparison to dyads with females who gave birth to female infants (contact change: p < 0.05 in 2/3 models; proximity change: p < 0.001 in 3/3 models). These findings add to previous data indicating that male capuchins do not recognize their offspring or have the motivation to preferentially invest in their care. We suggest that the observed sex bias may be a form of sex-specific socialization connected to the importance of forming long-term cooperative male bonds that are maintained via male parallel dispersal in this species.

Abstract Image

宝宝凑成三人:白面卷尾猴产后雌雄亲缘互动的变化。
在群居灵长类动物中,雄性对婴儿的投资变化很大。以往对多雌性灵长类的研究发现,雄性对婴儿的直接或间接照料可能是提高后代存活率、提高社会地位、投资于未来交配机会和/或投资于未来的社会或联盟伙伴的一种手段,其中任何一种手段都可能提高适应性结果。雄性白面卷尾猴(Cebus imitator)与婴儿之间的关系变化很大,从群体稳定时期的中性到高度附属关系,到不稳定时期的致命关系。我们利用亲子鉴定分析和行为观察,研究了亲子鉴定地位、雌性优势等级、雄性优势等级和婴儿性别对婴儿出生后卷尾猴雌雄之间隶属关系(接触和接近)变化率的影响(n = 92 对)。我们使用广义线性混合模型和信息论方法来选择平均模型。我们发现,婴儿出生后,雌雄隶属关系的总体比率有所增加(接触变化:+1.09 ± 2.55%;接近变化:+1.16 ± 3.08%)。婴儿性别是唯一显著的解释变量;与生下女婴的女性组成的二人组相比,生下男婴的男性和女性组成的二人组的接触时间和接近时间显著增加(接触变化:p
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来源期刊
CiteScore
4.50
自引率
8.30%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The objective of the American Journal of Primatology is to provide a forum for the exchange of ideas and findings among primatologists and to convey our increasing understanding of this order of animals to specialists and interested readers alike. Primatology is an unusual science in that its practitioners work in a wide variety of departments and institutions, live in countries throughout the world, and carry out a vast range of research procedures. Whether we are anthropologists, psychologists, biologists, or medical researchers, whether we live in Japan, Kenya, Brazil, or the United States, whether we conduct naturalistic observations in the field or experiments in the lab, we are united in our goal of better understanding primates. Our studies of nonhuman primates are of interest to scientists in many other disciplines ranging from entomology to sociology.
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