W. D. Helenbrook

The role of rivers as geographical barriers in shaping genetic differentiation and diversity of Neotropical primates

This study examines how river barriers affect genetic differentiation and diversity in Neotropical primates, finding a significant correlation between river width and molecular divergence.

Species distribution modeling and conservation assessment of the black-headed night monkey (Aotus nigriceps): A species of least concern that faces widespread anthropogenic threats

This study models the distribution of Aotus nigriceps and assesses habitat loss impacts, finding it faces significant anthropogenic threats despite being classified as Least Concern.

Habitat use, fruit consumption, and population density of the black-headed night monkey, Aotus nigriceps, in Southeastern Peru

The paper examines habitat use, group size, population density, and diet of black-headed night monkeys in secondary forests in Southeastern Peru, finding they thrive in proximity to humans.

Spatial variation in black-headed night monkey (Aotus nigriceps) vocalizations

The paper analyzes acoustic variability in black-headed night monkey vocalizations across social groups and populations, finding significant differences in call types and frequencies.