The Rancho La Brea locality is world famous for asphaltic deposits that trapped and preserved late Pleistocene megafauna over the last 50,000 years. This wealth of paleontological data allows for detailed investigation into paleoecological changes through the last glacial maximum into the Holocene. Here, we used dental mesowear analyses to infer dietary behavior in Bison antiquus, Equus occidentalis, and Camelops hesternus from five deposits (“pits”) spanning the latest Pleistocene: pits 77, 91, 13, 3, and 61/67. Mesowear was compared among pits for each taxon and discriminant function and posterior probability analyses were conducted using a modern dataset to predict dietary categories at Rancho La Brea. Published mesowear scores from late Pleistocene Bison, Equus and Camelops from other localities were included in the discriminant function and posterior probability analyses to assess dietary variability among regions. Mesowear for each taxon did not differ among pits. Posterior probabilities and discriminant function analyses recovered E. occidentalis as a strict grazer with B. antiquus and C. hesternus recovered as mixed feeders. The stability of mesowear scores through the latest Pleistocene suggests average diets of these herbivores did not significantly change at Rancho La Brea. This is in contrast to documented changes in climate and flora proxies of southern California. However, it is unclear whether these proxies are representative of climate and floral changes at Rancho La Brea. Mesowear scores from late Pleistocene populations of Equus, Bison, and Camelops indicate little variability in diet in Equus, modest variability in Bison, and high variability in Camelops. These analyses suggest large ungulates may have been more opportunistic in their feeding strategies and highlights the need for using multiple proxies to clarify dietary behavior of herbivores

Rancho La Brea地区以沥青沉积物而闻名，在过去的50,000年中，该沉积物捕获并保存了晚更新世的大型动物。大量的古生物学数据可用于对直到全新世的最后一次冰川最大期的古生态变化进行详细调查。在这里，我们使用了牙齿细小磨损分析来推断Bison antiquus，Equus occidentalis和Hesternus的饮食行为，这些饮食行为来自最新更新世的五个沉积物（“凹坑”）：凹坑77、91、13、3和61/67。比较每个分类单元的凹坑中的细观穿着和判别功能，并使用现代数据集进行后验概率分析，以预测兰乔拉布雷亚的饮食类别。晚更新世发布的中观服装评分判别功能和后验概率分析中包括了其他地区的野牛，马属和骆驼科动物，以评估区域间的饮食差异。每个分类单元的中型服装在各个凹坑之间没有差异。后验概率和判别函数分析将重发的西方大肠埃希氏菌作为严格的放牧者，与B. antiquus和C. hesternus一起使用作为混合喂食器被回收。最新的更新世的中观服装评分的稳定性表明，这些牧场动物的平均饮食在兰乔拉布雷亚（Rancho La Brea）没有显着变化。这与南加州的气候和植物区系替代物有记载的变化相反。但是，目前尚不清楚这些代理是否代表兰乔拉布雷亚的气候和花卉变化。从晚更新世人群Mesowear分数雅科仕，野牛，并拟驼表明饮食小变异雅科仕，在适度的可变性野牛，以及高可变性的拟驼。这些分析表明，大型有蹄类动物的进食策略可能更具机会性，并强调需要使用多种代理来明确草食动物的饮食行为