Ey, Elodie

[["dc.bibliographiccitation.firstpage","947"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","International Journal of Primatology"],["dc.bibliographiccitation.lastpage","960"],["dc.bibliographiccitation.volume","28"],["dc.contributor.author","Ey, Elodie"],["dc.contributor.author","Hammerschmidt, Kurt"],["dc.contributor.author","Seyfarth, Robert M."],["dc.contributor.author","Fischer, Julia"],["dc.date.accessioned","2018-03-08T09:22:21Z"],["dc.date.available","2018-03-08T09:22:21Z"],["dc.date.issued","2007"],["dc.description.abstract","Changes in vocalizations during ontogeny can in principle be related to three factors: growth, maturation, and experience, i.e., learning. While learning is a prerequisite for the proper development of speech, it hardly appears to play a role in the development of the species-typical vocal behavior of nonhuman primates. Nonetheless, subjects of different age and sex often exhibit prominent variation in the structure of their vocalizations. We investigated ontogenetic changes and the emergence of sex-related differences in the acoustic structure of Chacma baboon (Papio ursinus) clear calls. We recorded the vocalizations emitted by individuals separated from the rest of the group or from particular individuals, in a group of baboons in the Moremi Wildlife Reserve, Botswana. We analyzed calls from 58 baboons of both sexes and all age classes. While the structure of the call appeared to be fixed from birth, call duration, the distribution of energy, and the fundamental frequency of the calls, including modulation, varied with age and sex of the caller. We discuss how body size may explain the variations. Some of the variables exhibited a different profile of variation with age between the sexes, with significant differences becoming apparent around puberty. The emergence of these sexual differences may be explained by the onset of sexual dimorphism in body size and mass. To which degree the hormonal status contributes to variation in the calling remains to be investigated."],["dc.identifier.doi","10.1007/s10764-007-9139-3"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/12957"],["dc.language.iso","en"],["dc.notes.intern","GRO-Li-Import"],["dc.notes.status","final"],["dc.relation.doi","10.1007/s10764-007-9139-3"],["dc.relation.eissn","1573-8604"],["dc.relation.issn","0164-0291"],["dc.relation.issn","1573-8604"],["dc.title","Age- and Sex-Related Variations in Clear Calls of Papio ursinus"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","493"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Ethology"],["dc.bibliographiccitation.lastpage","503"],["dc.bibliographiccitation.volume","115"],["dc.contributor.author","Ey, Elodie"],["dc.contributor.author","Rahn, Charlotte"],["dc.contributor.author","Hammerschmidt, Kurt"],["dc.contributor.author","Fischer, Julia"],["dc.date.accessioned","2017-09-07T11:47:13Z"],["dc.date.available","2017-09-07T11:47:13Z"],["dc.date.issued","2009"],["dc.description.abstract","Sound propagates differently and visibility varies according to the habitat type. Animals should therefore adapt the acoustic structure and the usage of their vocal signals to the environment. In the present study, we examined the influence of the habitat on the vocal behaviour of wild olive baboons (Papio hamadryas anubis) in two populations: one living in Gashaka-Gumti National Park, Nigeria, and the other in Budongo Forest, Uganda. We investigated whether female baboons modified the acoustic structure of their grunts and their rate of grunting when they wandered between closed and open habitat types. As an adaptation to the environmental conditions, baboons might utter calls with a longer duration, a lower fundamental frequency and/or energy concentrated in lower frequencies in a closed habitat like forest than in an open habitat. Baboons should also grunt more frequently in the closed habitat. Analyses showed that in both populations grunts uttered in forest were significantly longer than in open habitat. Additionally, baboons from Uganda showed a significantly higher grunt rate in forest than in open habitat. These results revealed a certain degree of plasticity in vocal production and call usage with regard to the habitat type. However, results in Nigeria suggested that, besides habitat structure, other proximate factors like the context of calling and the proximity between group members could also have an influence on the actual communication patterns."],["dc.identifier.doi","10.1111/j.1439-0310.2009.01638.x"],["dc.identifier.gro","3150653"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7433"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0179-1613"],["dc.title","Wild Female Olive Baboons Adapt their Grunt Vocalizations to Environmental Conditions"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]