Abstract Lagidium viscacia is considered as a fragile species with patchy distribution, a strict habitat specialist and an obligatory diet specialist. The Southern Andean Precordillera constitutes an interesting environment to analyze the species’ presence across the altitudinal gradient. Diet selection and habitat use were studied in the summit plateau, characterized by rigorous conditions and vegetation representative of the Southern Puna. Pellet groups were counted in transects perpendicular to rock formations, and diet and vegetation were seasonally analyzed using microhistological analysis and point-quadrat transects. Vizcachas were strictly associated with rock formations at middle and high altitudes, with higher occurrence on the mountain summit where grasslands surrounded the rock formations. Vizcachas avoided shrubs associated with rock formations and preferred grasses on sandy soils. Phenological changes slightly affected the selective diet that involves a considerable search effort and risky feeding activity. Puna grasslands constituted attractive feeding places where L. viscacia’s activity decreased with distance from rock shelters as expected for a central-place forager. Habitat partitioning allows coexistence with Ctenomys mendocinus, despite the high dietary overlap between these central-place species. The high mobility and broad diet of Lama guanicoe reduce the competition risk. Lepus europaeus preferred shrubs and forbs, determining a discrete dietary overlap with vizcachas.

中文翻译：

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南安第斯Precordillera（阿根廷）的山地vizcacha（Lagidium v​​iscacia）的饮食选择和栖息地利用

摘要 Lagidium v​​iscacia 被认为是分布不均的脆弱物种，是严格的栖息地专家和强制性饮食专家。南安第斯山脉Precordillera 构成了一个有趣的环境来分析物种在海拔梯度上的存在。在山顶高原研究了饮食选择和栖息地使用，该高原的特点是严苛的条件和代表南普纳的植被。在垂直于岩层的横断面上计数颗粒群，并使用显微组织学分析和点样方横断面对饮食和植被进行季节性分析。Vizcachas 与中高海拔的岩层密切相关，在山峰上发生率较高，草原环绕着岩层。Vizcachas 避免与岩层相关的灌木和沙质土壤上的首选草。物候变化略微影响了选择性饮食，这涉及大量的搜索工作和危险的喂养活动。Puna 草原构成了有吸引力的觅食场所，L. viscacia 的活动随着与岩石庇护所距离的增加而减少，正如对中心位置觅食者所预期的那样。栖息地划分允许与 Ctenomys mendocinus 共存，尽管这些中心位置物种之间的饮食重叠很高。Lama guanicoe 的高流动性和广泛的饮食降低了竞争风险。Lepus europaeus 更喜欢灌木和杂草，决定了与 vizcachas 的离散饮食重叠。物候变化略微影响了选择性饮食，这涉及大量的搜索工作和危险的喂养活动。Puna 草原构成了有吸引力的觅食场所，L. viscacia 的活动随着与岩石庇护所距离的增加而减少，正如对中心位置觅食者所预期的那样。栖息地划分允许与 Ctenomys mendocinus 共存，尽管这些中心位置物种之间的饮食重叠很高。Lama guanicoe 的高流动性和广泛的饮食降低了竞争风险。Lepus europaeus 更喜欢灌木和杂草，决定了与 vizcachas 的离散饮食重叠。物候变化略微影响了选择性饮食，这涉及大量的搜索工作和危险的喂养活动。Puna 草原构成了有吸引力的觅食场所，L. viscacia 的活动随着与岩石庇护所距离的增加而减少，正如对中心位置觅食者所预期的那样。栖息地划分允许与 Ctenomys mendocinus 共存，尽管这些中心位置物种之间的饮食重叠很高。Lama guanicoe 的高流动性和广泛的饮食降低了竞争风险。Lepus europaeus 更喜欢灌木和杂草，决定了与 vizcachas 的离散饮食重叠。栖息地划分允许与 Ctenomys mendocinus 共存，尽管这些中心位置物种之间的饮食重叠很高。Lama guanicoe 的高流动性和广泛的饮食降低了竞争风险。Lepus europaeus 更喜欢灌木和杂草，决定了与 vizcachas 的离散饮食重叠。栖息地划分允许与 Ctenomys mendocinus 共存，尽管这些中心位置物种之间的饮食重叠很高。Lama guanicoe 的高流动性和广泛的饮食降低了竞争风险。Lepus europaeus 更喜欢灌木和杂草，决定了与 vizcachas 的离散饮食重叠。