Variation in local population size predicts social network structure in wild songbirds
Variation in local population size predicts social network structure in wild songbirds
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当地人口规模的变化预测了野生鸣禽的社交网络结构
DOI：
10.1111/1365-2656.14015
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发表时间：
2023
影响因子：
4.8
通讯作者：
Beck K
中科院分区：
文献类型：
--
作者：
Beck K
动物社会的结构是许多生态和进化过程的关键决定因素。然而，我们对构成社会结构的因素和机制知之甚少，其中，栖息地的配置可以影响社会结构。通过塑造动物运动的决定，栖息地的异质性，如植被和资源的可用性，可以影响个体的时空分布，并随后影响关键的社会生态特性，如当地人口规模和密度。在当地人口规模和密度的差异可以影响社会协会的机会，从而可能会推动当地的社会结构的重大变化，在这里，我们调查了时空变化的人口规模在65个不同的地点在一个小鸣禽，大山雀（山雀）及其对社会网络结构的影响。我们首先探讨了每周样本中种群规模的位置内一致性，以及观察到的当地种群规模的变化是否由潜在的栖息地配置预测。接下来，我们创建了社交网络从鸟类的觅食协会在每个位置的每个星期，并检查如果当地的人口规模影响社会structure.We表明，人口规模是高度重复的位置内跨周和年，一些观察到的变化，在当地人口规模预测的潜在栖息地，与位置更接近森林边缘的平均更大的人口规模。此外，我们表明，当地人口规模影响社会结构推断的四个全球网络指标。使用简单的模拟，我们发现，大部分观察到的社会结构是由社会过程。在不同的种群规模中，鸟类的社会结构在很大程度上可以解释为它们喜欢成群觅食。此外，除了社会觅食的影响之外，鸟类之间的社会偏好（即社会关系）塑造了某些网络特征，例如实现的社会联系的程度。因此，我们的研究结果表明，个体的社会决策在很大程度上有助于塑造某些社会网络特征，而不仅仅是人口规模的影响。
The structure of animal societies is a key determinant of many ecological and evolutionary processes. Yet, we know relatively little about the factors and mechanisms that underpin detailed social structure.Among other factors, social structure can be influenced by habitat configuration. By shaping animal movement decisions, heterogeneity in habitat features, such as vegetation and the availability of resources, can influence the spatiotemporal distribution of individuals and subsequently key socioecological properties such as the local population size and density. Differences in local population size and density can impact opportunities for social associations and may thus drive substantial variation in local social structure.Here, we investigated spatiotemporal variation in population size at 65 distinct locations in a small songbird, the great tit (Parus major) and its effect on social network structure. We first explored the within‐location consistency of population size from weekly samples and whether the observed variation in local population size was predicted by the underlying habitat configuration. Next, we created social networks from the birds' foraging associations at each location for each week and examined if local population size affected social structure.We show that population size is highly repeatable within locations across weeks and years and that some of the observed variation in local population size was predicted by the underlying habitat, with locations closer to the forest edge having on average larger population sizes. Furthermore, we show that local population size affected social structure inferred by four global network metrics. Using simple simulations, we then reveal that much of the observed social structure is shaped by social processes. Across different population sizes, the birds' social structure was largely explained by their preference to forage in flocks. In addition, over and above effects of social foraging, social preferences between birds (i.e. social relationships) shaped certain network features such as the extent of realized social connections.Our findings thus suggest that individual social decisions substantially contribute to shaping certain social network features over and above effects of population size alone.
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作者：
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通讯作者：
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DOI：
--
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期刊：
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影响因子：
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通讯作者：
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