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Ageing red deer alter their spatial behaviour and become less social
Nature Ecology & Evolution ( IF 16.8 ) Pub Date : 2022-07-21 , DOI: 10.1038/s41559-022-01817-9
Gregory F Albery 1, 2, 3 , Tim H Clutton-Brock 4 , Alison Morris 2 , Sean Morris 2 , Josephine M Pemberton 2 , Daniel H Nussey 2 , Josh A Firth 5, 6
Affiliation  

Social relationships are important to many aspects of animals’ lives, and an individual’s connections may change over the course of their lifespan. Currently, it is unclear whether social connectedness declines within individuals as they age, and what the underlying mechanisms might be, so the role of age in structuring animal social systems remains unresolved, particularly in non-primates. Here we describe senescent declines in social connectedness using 46 years of data in a wild, individually monitored population of a long-lived mammal (European red deer, Cervus elaphus). Applying a series of spatial and social network analyses, we demonstrate that these declines occur because of within-individual changes in social behaviour, with correlated changes in spatial behaviour (smaller home ranges and movements to lower-density, lower-quality areas). These findings demonstrate that within-individual socio-spatial behavioural changes can lead older animals in fission–fusion societies to become less socially connected, shedding light on the ecological and evolutionary processes structuring wild animal populations.



中文翻译:

衰老的马鹿改变了它们的空间行为并变得不那么社交

社会关系对动物生活的许多方面都很重要,并且个体的关系可能会在其生命周期中发生变化。目前,尚不清楚个体内部的社会联系是否会随着年龄的增长而下降,以及潜在的机制可能是什么,因此年龄在构建动物社会系统中的作用仍未得到解决,尤其是在非灵长类动物中。在这里,我们使用 46 年的野生数据描述了社会联系的衰老下降,这些数据来自单独监测的长寿哺乳动物(欧洲马鹿,Cervus elaphus )). 应用一系列空间和社会网络分析,我们证明这些下降的发生是由于社会行为的个体内部变化,以及空间行为的相关变化(较小的家庭范围和向低密度、低质量区域的移动)。这些发现表明,个体内部的社会空间行为变化会导致裂变-融合社会中的老年动物社会联系减少,从而揭示了构成野生动物种群的生态和进化过程。

更新日期:2022-07-22
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