The function of loud calls (Hoot Series) in wild western gorillas (Gorilla gorilla).

摘要: The use of loud vocal signals to reduce distance among separated social partners is well documented in many species; however, the underlying mechanisms by which reduction spacing occurs and how they differ across species remain unclear. Western gorillas (Gorilla gorilla) offer an opportunity investigate these issues because their repertoire includes a loud, long-distance call (i.e., hoot series) that potentially used within-group communication, whereas mountain identical exclusively during intergroup encounters. First, we tested whether series functions as contact/separation call. Second, examined individuals were more likely reply party was responsible for decreasing identify cognitive implications series. We collected behavioral, spatial, acoustic data on five adult over 15 months at Mondika Research Center (Republic Congo CAR). Hoot are individually distinct calls given both male female when from each other. Following hooting, between group members decreased significantly; thus concluded western this reestablish cohesion. way proximity achieved depended upon listeners replying or not caller. Replies may indicate conflict callers about intended travel direction, with interchanges serving negotiate consensus. Although features highly constrained closely related species, our results demonstrate function usage particular can be flexible. Am J Phys Anthropol 155:379–391, 2014. © 2014 Wiley Periodicals, Inc.