Understanding how niche differences evolve in ecologically similar species and how these differences are maintained is a fundamental question in ecology. We studied resource partitioning and niche overlap between the hoolock gibbon (Hoolock hoolock) and other frugivorous vertebrates from April 2016 to January 2018 in Satchari National Park, Sylhet, Bangladesh. We examined the differences in their diet, niche breadth, niche overlap, and characterization of patch use. We recorded feeding events of gibbons and other frugivorous vertebrates using ad libitum sampling. Gibbons consumed 76 plant species including 32 non-fig fruits and 14 figs. Twenty-one competing frugivorous vertebrate species shared 10–70% of their food species with hoolocks. Competition for fruits was intense among gibbons, macaques, and hornbills, as fruits comprised more than 50% of their diet. The niche breadth of the gibbons varied across seasons. It was lowest during the rainy season (B_A = 0.39) when fruits were more readily available, and highest in winter (B_A = 0.58) when gibbons were less selective due to food scarcity. The niche overlap was highest between gibbons and northern pig-tailed macaques (O_jk = 0.70), followed by gibbons and hornbills (O_jk = 0.68). Feeding heights and substrate used varied significantly between gibbons and competitors. Gibbons may minimize competition by specializing on various food resources and using different forest patches.

了解生态相似物种的生态位差异如何演变以及如何维持这些差异是生态学中的一个基本问题。我们研究了白眉长臂猿（Hoolock hoolock) 和其他食果脊椎动物从 2016 年 4 月到 2018 年 1 月在孟加拉国锡尔赫特的萨查里国家公园。我们检查了它们在饮食、生态位宽度、生态位重叠和贴片使用特征方面的差异。我们使用随意采样记录了长臂猿和其他食果脊椎动物的摄食事件。长臂猿食用了 76 种植物，包括 32 种非无花果水果和 14 种无花果。21 种相互竞争的食果脊椎动物物种与白眉鱼共享 10-70% 的食物种类。长臂猿、猕猴和犀鸟之间对水果的竞争非常激烈，因为水果占它们饮食的 50% 以上。长臂猿的生态位宽度因季节而异。 在水果更容易获得的雨季（B _A = 0.39）最低，在冬季最高（B_A  = 0.58) 当长臂猿由于食物稀缺而没有那么挑剔时。长臂猿和北猪尾猕猴的生态位重叠最高（O _jk  = 0.70），其次是长臂猿和犀鸟（O _jk  = 0.68）。长臂猿和竞争对手之间的喂食高度和使用的基材差异很大。长臂猿可以通过专门研究各种食物资源和使用不同的森林斑块来最大限度地减少竞争。