Abstract
ABSTRACT Jaguars are endangered in Mexico, with negative interactions with livestock producers being one of the main threats to their populations. We collared three jaguars with search Global Positioning System (GPS) clusters to document prey species eaten by them in the Sierra del Abra-Tanchipa Biosphere Reserve (RBSAT) and surrounding agrolandscape, in northeastern Mexico, to determine the relative use of natural prey and livestock. We detected, through examination of the carcasses (scavenging and predation events), 35 individual prey at feeding sites, primarily collared peccary (40% of sites), cattle (23%), and white-tailed deer (20%). Cattle comprised 64% and wild ungulates provided 34% of the estimated biomass in jaguar diets (biomass was calculated based on the estimated mass consumed and the assumption of an edible portion), with cattle consumed only during the dry season. Seasonal use apparently reflected increased encounters between jaguars and livestock during the dry season, probably due to the presence of limited permanent water sources concentrating livestock (and natural prey) along with jaguars taking advantage of the increased vulnerability of livestock during the dry season (either through predation or scavenging).
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