Lengele, Alexius (Weber State University)
Faculty Advisor: Seaboch, Melissa (Salt Lake Community College, Anthropology)
Primate defecation behaviors contribute notably to forest growth and diversity because primates are important seed dispersers in their environment. Understanding these defecation patterns is important to understand how primate populations impact tropical dry forests. Preexisting research on Allouatta seniculous (red howler monkeys) avoided defecating near their foraging and resting areas, potentially to avoid parasitic infection from contaminated feces. The goal of my research is to test whether the same pattern is found in A. palliata, the mantled howler monkey. I predicted that A. palliata would not defecate near their food resources as a parasite-avoidance behavior. La Selva Biological Station, where this research was conducted, is located in Sarapiqui, in northeastern Costa Rica. Data were collected in May 2017 at the beginning of the rainy season. Using all-occurrence sampling, I recorded all defecation events for A. palliata and whether any group members were feeding. I recorded 15 instances of defecation. Howler monkeys defecated in the same area where they had been feeding 46.7% of the time (n=7) and they defecated in an area where feeding did not occur 53.3% of the time (n=8). My hypothesis, that A. palliata would not defecate near food resources, was not supported as the data showed no bias toward non-feeding areas versus feeding areas. These results differ from prior research of Alouatta in the Amazon Basin, Venezuela, and Brazil, which all reported evidence of parasite-avoidance in defecation behavior. My sample size is small, and my data were collected in a short time span, likely contributing to this discrepancy. Additionally, the parasites infecting those species in South America may not be present in this Central American location, suggesting a lack of the need for this adaptive behavior.