Heavy metal ecotoxicology of vervet monkeys (Chlorocebus pygerythrus) across field sites in South Africa.

Primatologists use ecological models for understanding nonhuman primate (NHP) behavior and biology. Yet few studies have focused on the impacts of naturally occurring and anthropogenically derived toxicants in NHP habitats. For humans and NHPs, toxic levels of heavy metals frequently result in poor health outcomes including improper neurological development, immune system depression, and endocrine disruption. We analyzed the concentrations of lead (Pb), arsenic (As), and cadmium (Cd) in 48 vervet monkey (Chlorocebus pygerythrus) hair samples collected from eight South African groups living in environments with varying degrees of anthropogenic disturbance. We used two systems to categorize anthropogenic disturbance. The first was based on behavioral observations, home range overlap with human modified environments, and interviews with local people. The second system used stable isotope analysis (mean δ13C and δ15N hair values) from each group to estimate the consumption of C4 resources and the utilization of anthropogenically disturbed habitats. Preliminary analyses revealed differences in the Pb and As hair concentrations across the field sites (p < 0.05). Comparisons between anthropogenic disturbance using observations and interviews revealed differences in As (p < 0.01). In contrast, comparisons between categories using δ13C hair values revealed differences in Pb (p < 0.05). The results from this study suggest that multiple approaches using both qualitative and quantitative data should be employed to estimate the relationship between anthropogenic disturbance and environmental toxicants. Since many NHP populations share their habitats with humans, efforts to improve these landscapes would likely be beneficial for NHP and human health.