Sexual segregation is widely reported among sexually dimorphic species and generally attributed to intraspecific competition. Prey diversity and human activities can reinforce niche segregation by increasing resource heterogeneity. Here, we explored trophic and spatial sexual segregation in the only avian scavenger that exhibits pronounced sexual size dimorphism (up to 50% difference in body mass) and a highly despotic social system, the Andean condor (Vultur gryphus). We predicted that larger and dominant males would exclude smaller and subordinate females from high-quality resources, leading to sexual segregation particularly in human-dominated landscapes showing increased prey diversity. We compared resource use between females and males across six sites in Argentina featuring a range of prey diversity via stable isotopes analysis of molted feathers (n = 141 individuals). We then focused on two sites featuring contrasting levels of prey diversity and quantified assimilated diet via stable isotopes and space use via GPS monitoring (n = 23 and 12 tagged individuals). We found no clear differences in isotopic niche space, individual variation in isotopic signature, or assimilated diet between females and males. However, there were differences in foraging locations between sexes, with females apparently using areas of fewer food resources more frequently than males. Local conditions defined the dynamics of fine-scale sexual differences in foraging sites; yet, unpredictable and ephemeral carrion resources likely prevent segregation by sexes at the landscape scale. Our study highlights complex dynamics of sexual segregation in vultures and the relevancy of analyses under multiple spatial–temporal scales to explore segregation in social species.

性隔离是有性双态种之间的广泛报道，通常归因于种内竞争。猎物的多样性和人类活动可以通过增加资源的异质性来加强生态位隔离。在这里，我们探索了营养和空间性偏析在只禽类清除剂，能够表现出显着性大小异形（最多在体重50％的差异）和高度专制社会系统，安第斯秃鹰（Vultur gryphus）。我们预测，较大的和占优势的雄性会从高质量的资源中排除较小的和下属的雌性，从而导致性别隔离，尤其是在人类占主导的景观中，表明猎物多样性有所增加。通过对蜕皮羽毛的稳定同位素分析（n  = 141个人），我们比较了阿根廷六个地点的雌性和雄性资源的利用情况，这些资源具有范围广泛的猎物多样性。然后，我们重点研究了两个地点，这些地点具有不同的猎物多样性水平，并通过稳定的同位素和通过GPS监测来定量利用同化饮食（n = 23和12个加标签的个人）。我们没有发现男女之间的同位素生态位空间，同位素特征的个体差异或同化饮食方面存在明显差异。但是，性别之间觅食的地点存在差异，女性显然比男性更频繁地使用粮食资源较少的地区。当地条件决定了觅食地点小规模性别差异的动态；但是，不可预知的短暂腐肉资源可能会阻止景观范围内的性别隔离。我们的研究强调了秃鹰中性隔离的复杂动态，以及在多个时空尺度下探讨社会物种隔离的分析的相关性。