LAUSR

Abstract Competition often occurs between two or more sympatric species that use similar ecological niches. During competition, a superior species may exclude the competitor from parts of its fundamental niche or make it go extinct. Determining the potential competition between two sympatric species including an endangered one has important implications for conservation management. We evaluated potential food competition between the wild boar and the giant panda in a key national nature reserve established primarily for the giant panda protection. We monitored foraging plots for 9 years, conducted food macronutrient analysis, and combined our analysis with long-term population monitoring results for two species. The wild boar population increased dramatically in the past 18 years, benefiting from conservation policies of the Chinese government, whereas the giant panda population decreased. We found evidence for competition for bamboo shoots, an important seasonally limiting resource. The wild boar had a higher utilization rate at foraging plots than giant panda, which also avoided plots used by wild boar. This study indicates key seasonal food competition may exist between wild boar and giant panda. This competition for a key food resource may have negative impacts on giant panda populations, particularly under the substantial increase of the wild boar, yet this possibility has not figured prominently in conservation planning and policy for panda reserves. We suggest long-term monitoring of this competitive relationship across reserves to determine when and where management intervention is needed. And, we might need more flexible policies instead of the current “one size fits all” one.