Abstract The development of agro-ecosystems in the pastures of the Pampean Region has substantially modified their structure and functioning. Many wild mammal populations in the Argentinean Pampas face habitat loss and/or fragmentation due to human activities, resulting in harmful genetic effects. The screaming hairy armadillo ( Chaetophractus vellerosus ) is a species considered an indicator of the state of preservation of the environments it inhabits. However, very little information is available about its mating system in the wild. In this sense, an isolated population of the screaming hairy armadillo in the northeast of Buenos Aires Province, which is separated from the main distribution area of the species by about 500 km, requires special attention. Genetic studies that analyzed social behavior and mating systems in Xenarthra are scarce but necessary to establish conservation actions for the isolated screaming hairy armadillo population under study. Thus, we analyzed the existence of a possible social organization in the species, together with its mating system, using a set of previously characterized microsatellites. Our results showed a complex scenario for the dispersal and mating system in this C. vellerosus population. Males disperse and females have a philopatric tendency with some degree of dispersal. This strategy, in combination with a polygynous-polyandrous mating system, could enhance genetic variability in this small and isolated population. In addition, no evidence of social organization was found.

中文翻译：

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遗传方法揭示了一个一夫多妻 - 一夫多妻的交配系统，并且在一个小而孤立的尖叫毛犰狳种群中没有社会组织， Chaetophractus vellerosus

摘要 Pampean 地区牧场农业生态系统的发展极大地改变了它们的结构和功能。由于人类活动，阿根廷潘帕斯草原的许多野生哺乳动物种群面临栖息地丧失和/或破碎化，从而导致有害的遗传影响。尖叫的长毛犰狳 ( Chaetophractus velerosus ) 被认为是其栖息环境保护状况的一个指标。然而，关于它在野外的交配系统的信息很少。从这个意义上说，布宜诺斯艾利斯省东北部与该物种的主要分布区相隔约 500 公里的孤立种群的尖叫毛犰狳需要特别关注。分析 Xenarthra 的社会行为和交配系统的遗传研究很少，但对于为所研究的孤立的尖叫毛犰狳种群建立保护行动是必要的。因此，我们使用一组先前表征的微卫星分析了该物种中可能存在的社会组织及其交配系统。我们的结果显示了该 C. velerosus 种群中扩散和交配系统的复杂情况。雄性分散，雌性有一定程度的分散性。这种策略与一夫多妻-一妻多夫交配系统相结合，可以增强这个小而孤立的种群的遗传变异性。此外，没有发现社会组织的证据。