Trophic interactions between the native guanaco (Lama guanicoe) and the exotic donkey (Equus asinus) in the hyper-arid Monte desert (Ischigualasto Park, Argentina)

A high overlap in diets between the native guanaco and exotic feral donkey during the dry season suggests potential competition, which could intensify with increasing donkey populations. The study quantified food availability, analyzed diet composition through microhistological fecal analysis, and assessed seasonal dietary shifts. While donkeys consistently relied on grasses, guanacos primarily consumed shrubs, especially during the wet season when grass cover was minimal or absent. This research highlights the ecological impact of invasive species on native fauna in hyper-arid ecosystems like Ischigualasto Provincial Park.

Reus, M. L., Cappa, F. M., Andino, N., Campos, V. E., de los Ríos, C., & Campos, C. M. (2014). Trophic interactions between the native guanaco (Lama guanicoe) and the exotic donkey (Equus asinus) in the hyper-arid Monte desert (Ischigualasto Park, Argentina). Studies on Neotropical Fauna and Environment, 49(3), 159–168. https://doi.org/10.1080/01650521.2014.948772