Midsummer Trophic Overlap Between Guanaco and Sheep in Patagonian Rangelands

摘要: Abstract Diet overlap estimation among species is important to understand interspecific interactions. Through these interactions, one may extinguish others through competition or adapt mechanisms such as resource partitioning. The introduction of domestic herbivores in a native assemblage introduce for resources with wild herbivores. In southern Patagonian steppes, guanaco (Lama guanicoe) populations are increasing after drastic demise during the past century. This occurring protected areas and extensive ranching sheep, latter ranchers have rising concerns regarding competition. this observational study, we measured diet overlap, food selection preferences, niche width sheep compare use summer season. Feces were analyzed microhistological technique determine diets. Diets dominated by tussock grass (Festuca gracillima, > 60%, 50%), most abundant plant species. Although widths, Levin’s Index, narrow, presented broadest (P 0.90), evidencing potential addition, coupled our results small variation selectivity suggest absence Therefore, both might share coexist, possibly due high availability spatial distribution resilience cope numerically dominant from sheep. These findings offer new insight into understanding species’ It also management challenge emerging well livestock production at large.