Siberian jays help conspecifics in distress regardless of social familiarity

Helping behaviour has evolved across taxa and contexts, and shows considerable variation between individuals. While the role of kinship in modulating helping is established, recent studies highlight the importance of social bonds between actors and recipients. Theoretical and empirical work in humans and other animals shows that stronger social bonds can increase the likelihood of helping. Here, we assessed the role of social bond strength in wild Siberian jays (Perisoreus infaustus). Using playbacks of distress calls, we investigated whether individuals responded more strongly to calls from those with whom they shared stronger bonds. We exposed focal individuals to distress calls from a group member and an unfamiliar individual, alongside controls. Focal individuals responded strongly by approaching the speaker and vocalising, including producing distress calls. Although individuals modulate responses based on caller identity in other contexts, they responded similarly to distress call..., , # Siberian jays help conspecifics in distress regardless of social familiarity

Data and code associated with the manuscript \"Siberian jays help conspecifics in distress regardless of social familiarity\".

Find exemplary playback stimuli (presented in Figure 1 in the manuscript) together with their spectrograms in the folder \"Example_calls_Figure_1.zip\".

Script \"Spectral_cross_correlation.R\"

* Calculates SNR
* Calculates spectral cross-correlation for each distress call element in the distress call recordings.
* Find these recordings in the folder \"WAV.zip\". (Note that these are the recordings used for the spectral cross-correlation. For the playback experiment, some of those were modified (e.g., elements duplicated), see information on this in \"mydata.csv\" - described below).
* Uses \"selection_table.txt\" which contains information on the beginning/end of each element to be analysed.

Script \"Analysis_distress_2025.R\"

First part for Results (Tables and Figures) for the main text, sec...,

跨类群与多种情境下均演化出互助行为，且个体间的互助行为存在显著差异。尽管亲缘关系对互助行为的调控作用已得到证实，但近期研究凸显了施助者与受助者之间社会纽带的重要性。针对人类及其他动物开展的理论与实证研究均表明，更强的社会纽带可提升互助行为发生的概率。本研究以野生西伯利亚松鸦（Siberian jay，Perisoreus infaustus）为研究对象，通过遇险叫声回放实验，探究个体是否会对与其社会纽带更强的呼叫者做出更强烈的反应。我们将焦点个体暴露于同群成员与陌生个体的遇险叫声回放刺激，并设置了对照组。结果显示，焦点个体通过靠近扬声器、鸣叫（包括发出遇险叫声）等方式表现出强烈响应。尽管在其他情境中个体会根据呼叫者身份调整响应策略，但本研究中个体对遇险叫声的响应模式未出现显著差异（原文此处截断）。

# 西伯利亚松鸦会向遇险的同种个体提供互助，不受社交熟悉度影响
本数据集与代码关联于论文《Siberian jays help conspecifics in distress regardless of social familiarity》。

在"Example_calls_Figure_1.zip"文件夹中可获取对应论文图1的典型回放刺激样本及其语谱图。

脚本"Spectral_cross_correlation.R"：
* 计算信噪比（SNR）
* 对遇险叫声录音中的每个叫声元素计算频谱互相关
* 相关录音文件可在"WAV.zip"文件夹中获取（注：这些录音仅用于频谱互相关分析；回放实验中部分录音已被修改，例如重复了叫声元素，详细说明请参见下文的"mydata.csv"）
* 该脚本依赖"selection_table.txt"，该文件包含待分析的每个叫声元素的起止位置信息。

脚本"Analysis_distress_2025.R"：
用于生成正文中结果部分（表格与图件）的第一部分，后续内容原文截断。