Kaludiyapokuna Primate Conservation and Research Center
We use both Passive Acoustic Monitoring and close range recording to monitor langur populations and better understand their vocal repertoire. On a regional level, Alexandra Hofner uses passive monitors to record the loud call vocalizations of gray and purple-faced langurs to better define the distribution of these animals in the dry zone and their habitat use on a smaller scale in and around Kaludiyapokuna Forest. To date, there is little known about the habitat use of the Northern subspecies of purple-faced langur, however they appear to be confined to closed forests. In contrast, the gray langur can be found in a range of habitats including urban centers. With this multiscale project, we aim to publish better defined habitat requirements for these species to contribute to habitat protections.
Together with behavioral follows, we also record the vocalizations of both species of langurs to understand their communication behaviors and vocal repertoire. By recording vocalizations with fine-scale behavioral observations, we can better understand the functions of langur vocalizations within and between social groups. This research area is an exciting opportunity to learn about why langurs vocalize and what information their sounds share with other individuals about predators, food, and group dynamics. By carrying out diverse bioacoustic research, we are excited to train students interested in bioacoustic projects using a range of equipment and techniques.