Variable infant care contributions in cooperatively breeding groups of wild saddleback tamarins.,American Journal of Primatology

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Variable infant care contributions in cooperatively breeding groups of wild saddleback tamarins.
American Journal of Primatology ( IF 2.0 ) Pub Date : 2020-09-18 , DOI: 10.1002/ajp.23190
Wendy M Erb _{1,

2,

3,

4} , Leila M Porter ₄

Affiliation

Among non‐human primates, alloparental infant care is most extensive in callitrichines, and is thought to be particularly costly for tamarins whose helpers may suffer increased energy expenditure, weight loss, and reduced feeding time and mobility. The costs and benefits of infant care likely vary among group members yet very few wild studies have investigated variable infant care contributions. We studied infant care over an 8‐month period in four wild groups of saddleback tamarins in Bolivia to evaluate: (a) what forms of infant care are provided, by whom, and when, (b) how individuals adjust their behavior (activity, vigilance, height) while caring for infants, and (c) whether individuals differ in their infant care contributions. We found that infant carrying, food sharing, and grooming varied among groups, and immigrant males—those who joined the group after infants were conceived—participated less in infant care compared to resident males. Adult tamarins fed less, rested more, and increased vigilance while carrying infants. Although we did not detect changes in overall activity budgets between prepartum and postpartum periods, tamarins spent more time scanning their environments postpartum, potentially reflecting increased predation risk to both carriers and infants during this period. Our study provides the first quantitative data on the timing and amount of infant carrying, grooming, and food transfer contributed by all individuals within and among multiple wild groups, filling a critical knowledge gap about the factors affecting infant care, and highlighting evolutionary hypotheses for cooperative breeding in tamarins.

中文翻译：

野生马鞍ta猴的合作繁殖组中的可变婴儿护理贡献。

在非人类的灵长类动物中，同苯二酚婴儿护理中卡里氏菌素的使用范围最广，据认为对于绢毛猴而言，这特别昂贵，因为绢毛猴的助手可能会增加能量消耗，体重减轻，进食时间和活动性降低。婴儿照料的成本和收益可能在小组成员之间有所不同，但是很少有野外研究调查可变的婴儿照料贡献。我们在玻利维亚的四个野生马鞍猴中，对八个月期间的婴儿护理进行了研究，以评估：（a）提供哪种形式的婴儿护理，由谁提供，何时提供，（b）个人如何调整其行为（活动，照顾婴儿时保持警觉，身高），以及（c）个人在婴儿护理方面的贡献是否不同。我们发现婴儿的携带，食物共享和修饰在各组之间是不同的，与移民男性相比，那些受孕后才加入该群体的男性与住院男性相比，参与婴儿护理的人数较少。成年的绢毛猴在喂养婴儿时吃得更少，休息更多并提高警惕。尽管我们没有发现产前和产后期间总体活动预算的变化，但绢毛猴在产后花费了更多的时间扫描其环境，这可能反映了此期间携带者和婴儿的捕食风险增加。我们的研究提供了第一批定量数据，这些数据涉及多个野生群体内部和之中所有个体对婴儿进行携带，修饰和食物转移的时间和数量，填补了影响婴儿护理的因素的关键知识空白，并突出了合作的进化假设在绢毛猴中繁殖。

更新日期：2020-11-19

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