Social ties drive post-fission group choice in blue monkeys

Permanent group fissions present rare opportunities for individuals in philopatric groups to select their groupmates. Studying post-fission group choice allows insights into how sociality influences animal decision-making and which social ties are important to group-living individuals. Our first analysis investigated which social ties influenced post-fission group choice in adult female blue monkeys by considering the strength and consistency of their ties with their original group’s members, as well as their dominance relations, relatedness to other female group members, and risk of infanticide. We used these dyadic and nodal characteristics in a separable temporal exponential random graph model to model edge persistence across two timesteps, before vs. after fission. Our second analysis used a conditional logit model to investigate the role of the original group’s resident male in a female’s post-fission group choice, assessing the strength of her tie to him and her vulnerability to i..., Observational data were collected from blue monkeys (Cercopithecus mitis stuhlmanni) in the Kakamega Forest, western Kenya surrounding five instances of group fission that occurred between 2008 and 2019. During the study period, trained observers monitored the different groups on a near daily basis, conducting focal animal samples on all adult females (classified as adults from the day they give birth to their first offspring). Focal animal samples were designed to last 30 min, and were retained in the dataset if they were at least 20 min long. On each day, females were chosen as subjects so that focal samples accumulated evenly across individuals and among different periods of the day (morning, midday, afternoon). Instantaneous recording of the focal subject’s behavior occurred at 1-minute intervals and included the identities of any social partners and individuals in proximity (within 1m). Agonistic interactions (with one individual showing submission) were recorded during focal sampl..., , # Data from: Social ties drive post-fission group choice in blue monkeys

[https://doi.org/10.5061/dryad.xd2547drj](https://doi.org/10.5061/dryad.xd2547drj)

Permanent group fissions present rare opportunities for individuals in philopatric groups to select their groupmates, and so by studying post-fission group choice, we can gain insight into how sociality influences decision-making. Our study investigated which social ties and individual attributes influence post-fission group choice in blue monkeys by considering the strength and consistency of female’s ties to social affiliates, her relatedness to female peers, her relative rank, her vulnerability to infanticide, and her tie with the original group’s resident male. We found that females maintained different kinds of relationships during fission (those with social affiliates and the original group’s resident male). Here we present two datasets (and associated R code) used in this analysis, one (Dataset 1) including attributes of dya...,

永久群体分裂为定居型群居群体（philopatric groups）中的个体提供了罕见的选择群体伙伴的机会。研究分裂后的群体选择，能够帮助我们理解社会性如何影响动物决策，以及哪些社会纽带对群居个体而言至关重要。我们的第一项分析以成年雌性蓝猴为研究对象，考察了哪些社会纽带会影响其分裂后的群体选择，具体考量了它们与原群体成员的纽带强度与稳定性、支配关系、与其他雌性群体成员的亲缘关系，以及杀婴风险。我们采用可分离时间指数随机图模型（separable temporal exponential random graph model），基于二元特征与节点特征，对分裂前后两个时间节点的边持久性进行建模。第二项分析则使用条件logit模型（conditional logit model），探究原群体定居雄性在雌性分裂后群体选择中的作用，评估雌性与该雄性的纽带强度以及其面临的i...。观测数据采集自肯尼亚西部卡卡梅加森林的蓝猴（Cercopithecus mitis stuhlmanni）种群，涵盖2008年至2019年间发生的5次群体分裂事件。研究期间，经过培训的观察员几乎每日对各群体进行监测，对所有成年雌性（以产下首只幼崽当日起计为成年个体）开展目标动物取样法（focal animal samples）。目标动物取样时长设定为30分钟，若取样时长不少于20分钟则纳入数据集。每日选取的观测个体需确保各个体以及每日不同时段（上午、中午、下午）的取样量分布均衡。以1分钟为间隔对目标个体的行为进行瞬时记录，记录内容包括所有社交伙伴及近距离（1米范围内）个体的身份。争斗互动（即某一个体表现出顺从行为的互动）在取样期间进行记录sampl...。# 数据来源：Social ties drive post-fission group choice in blue monkeys
[https://doi.org/10.5061/dryad.xd2547drj](https://doi.org/10.5061/dryad.xd2547drj)

永久群体分裂为群居个体提供了罕见的群体伙伴选择机会，因此通过研究分裂后的群体选择，我们能够深入理解社会性如何影响动物决策。本研究以蓝猴为对象，考察了社会纽带与个体属性如何影响雌性的分裂后群体选择，具体考量了雌性与社交伙伴的纽带强度与稳定性、与雌性同伴的亲缘关系、相对等级地位、杀婴风险，以及与原群体定居雄性的纽带。我们发现雌性在群体分裂过程中会维持不同类型的社会关系（包括与社交伙伴以及原群体定居雄性的关系）。本文呈现了本分析所用的两套数据集（及配套R代码），其中第一套（数据集1）包含二元特征的相关属性dya...