SREL Reprint #3824

Seasonal changes in occupancy and activity patterns in native Collared Peccary and non-native wild pig and Common Warthog in southern Texas, the United States

Caitlin A. Kupferman1,2, Nathan P. Snow3, Kurt C. VerCauteren3, Madeline H. Melton1,2, Whitney J. Gann4,
and James C. Beasley1,2

1Savannah River Ecology Laboratory, University of Georgia, Aiken, SC, United States
2Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, United States
3United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services,
National Wildlife Research Center, Fort Collins, CO, United States
4Texas Parks and Wildlife, Chaparral Wildlife Management Area, Cotulla, TX, United States

Abstract: Southern Texas, USA, is home to native collared peccaries (Dicotyles tajacu) and introduced populations of invasive wild pigs (generally Sus scrofa × domesticus hybrids) and non-native African warthogs (Phacochoerus africanus). Although these ecologically similar mammals co-occur in this region, the potential impacts of invasive suids on collared peccaries are poorly understood. We examined co-occupancy and activity pattern overlap of collared peccaries, wild pigs, and warthogs across 3 seasons (fall, winter, and spring) using remote camera data collected from Chaparral Wildlife Management Area, Cotulla, Texas (November 2020 to June 2021). Using activity pattern analyses and single and 2-species occupancy models incorporating habitat and climate characteristics, we found evidence of extensive spatial overlap between all species pairs and varying degrees of temporal overlap depending on species pairs and season. Collared peccaries and wild pigs displayed moderate temporal overlap across all seasons. Collared peccaries appeared to alter fall activity in the presence of wild pigs to be active earlier in the morning and less active during the day. Collared peccaries and warthogs had low-to-moderate temporal overlap (low in fall, winter; moderate in spring). Wild pigs and warthogs had low temporal overlap (fall, spring) and wild pigs appeared to alter activity in the presence of warthogs (fall), becoming less active during the day during peak warthog activity. Overall, our results suggest that peccary, wild pig, and warthog interactions and activity are dynamic and vary seasonally according to the ecology and preferred environmental conditions of each species. Given the potential for interspecific competition and disease transmission with Collared Peccary and other native wildlife, resource partitioning between wild pigs and warthogs needs to be further examined to aid in effective management strategies.

Keywords: Dicotyles tajacu, feral hog, feral swine, invasive species, javelina, Pecari tajacu, Phacochoerus africanus, Sus scrofa

SREL Reprint #3824

Kupferman, C. A., N. P. Snow, K. C. VerCauteren, M. H. Melton, W. J. Gann, and J. C. Beasley. 2025. Seasonal changes in occupancy and activity patterns in native Collared Peccary and non-native wild pig and Common Warthog in southern Texas, the United States. Journal of Mammalogy (106): 671-682.

This information was provided by the University of Georgia's Savannah River Ecology Laboratory (srel.uga.edu).