Ecological similarity between species can lead to interspecific trophic competition. However, when ecologically similar species coexist, they may differ in foraging strategies and habitat use, which can lead to niche partitioning. As the body tissues of consumers contain a stable isotope signature that reflects the isotopic composition of their diet, stable isotope analysis is a useful tool to study feeding behavior. We measured the isotopic niche width, which is a proxy for trophic niche width, of mantled (Alouatta palliata ) and black (A. pigra ) howler monkeys. Specifically, studied populations in allopatry and sympatry to assess whether these species showed niche partitioning.

中文翻译：

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两种同patri吼猴物种中的同位素生态位分配。

物种之间的生态相似性可能导致种间营养竞争。但是，当生态相似的物种共存时，它们的觅食策略和栖息地使用可能会有所不同，这可能会导致生态位分配。由于消费者的身体组织包含反映其饮食同位素组成的稳定同位素特征，因此稳定同位素分析是研究喂养行为的有用工具。我们测量了man（Alouatta palliata）和黑（A. pigra）ler叫猴子的同位素生态位宽度，这是营养生态位宽度的代表。具体而言，研究了同种异体和共生动物的种群，以评估这些物种是否表现出生态位分配。