Fischer, Julia

[["dc.bibliographiccitation.firstpage","147"],["dc.bibliographiccitation.lastpage","176"],["dc.contributor.author","Cheney, Dorothy L."],["dc.contributor.author","Seyfarth, Robert M."],["dc.contributor.author","Fischer, Julia"],["dc.contributor.author","Beehner, Jacinta C."],["dc.contributor.author","Bergman, Thore J."],["dc.contributor.author","Johnson, S."],["dc.contributor.author","Kitchen, Dawn M."],["dc.contributor.author","Palombit, Ryne A."],["dc.contributor.author","Rendall, Drew"],["dc.contributor.author","Silk, Joan B."],["dc.contributor.editor","Swedell, Larissa"],["dc.contributor.editor","Leigh, Steven R."],["dc.date.accessioned","2018-03-08T09:22:22Z"],["dc.date.available","2018-03-08T09:22:22Z"],["dc.date.issued","2006"],["dc.description.abstract","Predation, food competition, and infanticide all negatively impact female reproductive success. Female dominance rank may mitigate these effects, if competitive exclusion allows high-ranking females to gain priority of access to critical food resources. It may also exacerbate them, if low-ranking females are forced to feed or rest in marginal habitats where they are at increased risk. In this chapter, we present data on reproduction, mortality, and female reproductive success from a 10-year study of free-ranging chacma baboons (Papio hamadryas ursinus) in the Okavango Delta of Botswana and examine the influence of predation, infanticide, and dominance rank on female reproductive success. Predation appeared to be the cause of most deaths among adult females and juveniles, whereas infanticide was the most likely cause of deaths among infants. Seasonality strongly affected both births and mortality: The majority of conceptions occurred during the period of highest rainfall. Mortality due to predation and infanticide was highest during the 3-month period when flooding was at its peak, most likely because the group was more constrained to move along predictable routes during this time. Those reproductive parameters most likely to be associated with superior competitive ability-interbirth interval and infant growth rates-conferred a slight fitness advantage on high-ranking females. This fitness advantage was counterbalanced, however, by the effects of infanticide and predation. Infanticide affected high- and low-ranking females more than middle-ranking females, while predation affected females of all ranks relatively equally. As a result, there were few rank-related differences in estimated female lifetime reproductive success."],["dc.identifier.doi","10.1007/978-0-387-33674-9_7"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/12962"],["dc.language.iso","en"],["dc.notes.intern","GRO-Li-Import"],["dc.notes.status","final"],["dc.publisher","Springer"],["dc.publisher.place","Boston, MA"],["dc.relation.crisseries","Developments in Primatology"],["dc.relation.doi","10.1007/978-0-387-33674-9_7"],["dc.relation.eisbn","978-0-387-33674-9"],["dc.relation.isbn","978-0-387-30688-9"],["dc.relation.isbn","978-0-387-33674-9"],["dc.relation.ispartof","Reproduction and Fitness in Baboons: Behavioral, Ecological, and Life History Perspectives"],["dc.relation.ispartofseries","Developments in Primatology: Progress and Prospects"],["dc.title","Reproduction, Mortality, and Female Reproductive Success in Chacma Baboons of the Okavango Delta, Botswana"],["dc.type","book_chapter"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","33"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Ethology"],["dc.bibliographiccitation.lastpage","54"],["dc.bibliographiccitation.volume","107"],["dc.contributor.author","Fischer, Julia"],["dc.contributor.author","Hammerschmidt, Kurt"],["dc.contributor.author","Cheney, Dorothy L."],["dc.contributor.author","Seyfarth, Robert M."],["dc.date.accessioned","2022-10-06T13:34:25Z"],["dc.date.available","2022-10-06T13:34:25Z"],["dc.date.issued","2001"],["dc.description.abstract","We studied variation in the loud barks of free-ranging female chacma baboons (Papio cynocephalus ursinus) with respect to context, predator type, and individuality over an 18-month period in the Moremi Game Reserve, Botswana. To examine acoustic differences in relation to these variables, we extracted a suite of acoustic parameters from digitized calls and applied discriminant function analyses. The barks constitute a graded continuum, ranging from a tonal, harmonically rich call into a call with a more noisy, harsh structure. Tonal barks are typically given when the signaler is at risk of losing contact with the group or when a mother and infant have become separated (contact barks). The harsher variants are given in response to large predators (alarm barks). However, there are also intermediate forms between the two subtypes which may occur in both situations. This finding is not due to an overlap of individuals' distinct distributions but can be replicated within individuals. Within the alarm bark category, there are significant differences between calls given in response to mammalian carnivores and those given in response to crocodiles. Again, there are intermediate variants. Both alarm call types are equally different from contact barks, indicating that the calls vary along different dimensions. Finally, there are consistent, significant differences among different individuals' calls. However, individual identity in one call type cannot directly be inferred from knowledge of the individuals' call characteristics in the other. In sum, the barks of female baboons potentially provide rich information to the recipients of these signals. The extent to which baboons discriminate between alarm and contact barks, and classify calls according to context and/or acoustic similarity will be described in a subsequent paper."],["dc.identifier.doi","10.1111/j.1439-0310.2001.00630.x"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/115901"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-602"],["dc.notes.status","final"],["dc.relation.eissn","1439-0310"],["dc.relation.issn","0179-1613"],["dc.relation.orgunit","Deutsches Primatenzentrum"],["dc.title","Acoustic Features of Female Chacma Baboon Barks"],["dc.title.subtitle","Chacma Baboon Barks"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","401"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","International Journal of Primatology"],["dc.bibliographiccitation.lastpage","428"],["dc.bibliographiccitation.volume","25"],["dc.contributor.author","Cheney, Dorothy L."],["dc.contributor.author","Seyfarth, R. M."],["dc.contributor.author","Fischer, Julia"],["dc.contributor.author","Beehner, J."],["dc.contributor.author","Bergman, T."],["dc.contributor.author","Johnson, S."],["dc.contributor.author","Kitchen, Dawn M."],["dc.contributor.author","Palombit, Ryne A."],["dc.contributor.author","Rendall, Drew"],["dc.contributor.author","Silk, Joan B."],["dc.date.accessioned","2018-03-08T09:22:21Z"],["dc.date.available","2018-03-08T09:22:21Z"],["dc.date.issued","2004"],["dc.description.abstract","We present results of a 10-year study of free-ranging gray-footed chacma baboons (Papio ursinus griseipes) in the Okavango Delta of Botswana. The majority of deaths among adult females and juveniles were due to predation, while infants were more likely to die of infanticide. There were strong seasonal effects on birth and mortality, with the majority of conceptions occurring during the period of highest rainfall. Mortality due to predation and infanticide was highest during the 3-mo period when flooding was at its peak, when the group was more scattered and constrained to move along predictable routes. The reproductive parameters most likely to be associated with superior competitive ability—interbirth interval and infant growth rates—conferred a slight fitness advantage on high-ranking females. However, it was counterbalanced by the effects of infanticide and predation. Infanticide affected high- and low-ranking females more than middle-ranking females, while predation affected females of all ranks relatively equally. As a result, there were few rank-related differences in estimated female lifetime reproductive success."],["dc.identifier.doi","10.1023/B:IJOP.0000019159.75573.13"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/12955"],["dc.language.iso","en"],["dc.notes.intern","GRO-Li-Import"],["dc.notes.status","final"],["dc.relation.doi","10.1023/B:IJOP.0000019159.75573.13"],["dc.relation.eissn","1573-8604"],["dc.relation.issn","0164-0291"],["dc.relation.issn","1573-8604"],["dc.title","Factors Affecting Reproduction and Mortality Among Baboons in the Okavango Delta, Botswana"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1465"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","The Journal of the Acoustical Society of America"],["dc.bibliographiccitation.lastpage","1474"],["dc.bibliographiccitation.volume","111"],["dc.contributor.author","Fischer, Julia"],["dc.contributor.author","Hammerschmidt, Kurt"],["dc.contributor.author","Cheney, Dorothy L."],["dc.contributor.author","Seyfarth, Robert M."],["dc.date.accessioned","2018-03-08T09:22:21Z"],["dc.date.available","2018-03-08T09:22:21Z"],["dc.date.issued","2002"],["dc.description.abstract","The acoustic structure of loud calls (“wahoos”) recorded from free-ranging male baboons (Papio cynocephalus ursinus) in the Moremi Game Reserve, Botswana, was examined for differences between and within contexts, using calls given in response to predators (alarm wahoos), during male contests (contest wahoos), and when a male had become separated from the group (contact wahoos). Calls were recorded from adolescent, subadult, and adult males. In addition, male alarm calls were compared with those recorded from females. Despite their superficial acoustic similarity, the analysis revealed a number of significant differences between alarm, contest, and contact wahoos. Contest wahoos are given at a much higher rate, exhibit lower frequency characteristics, have a longer “hoo” duration, and a relatively louder “hoo” portion than alarm wahoos. Contact wahoos are acoustically similar to contest wahoos, but are given at a much lower rate. Both alarm and contest wahoos also exhibit significant differences among individuals. Some of the acoustic features that vary in relation to age and sex presumably reflect differences in body size, whereas others are possibly related to male stamina and endurance. The finding that calls serving markedly different functions constitute variants of the same general call type suggests that the vocal production in nonhuman primates is evolutionarily constrained."],["dc.identifier.doi","10.1121/1.1433807"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/12954"],["dc.language.iso","en"],["dc.notes.intern","GRO-Li-Import"],["dc.notes.status","final"],["dc.relation.doi","10.1121/1.1433807"],["dc.relation.issn","0001-4966"],["dc.title","Acoustic features of male baboon loud calls: Influences of context, age, and individuality"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1825"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Behavioral Ecology and Sociobiology"],["dc.bibliographiccitation.lastpage","1835"],["dc.bibliographiccitation.volume","67"],["dc.contributor.author","Kitchen, Dawn M."],["dc.contributor.author","Cheney, Dorothy L."],["dc.contributor.author","Engh, A. L."],["dc.contributor.author","Fischer, J."],["dc.contributor.author","Moscovice, L. R."],["dc.contributor.author","Seyfarth, Robert M."],["dc.date.accessioned","2017-09-07T11:47:09Z"],["dc.date.available","2017-09-07T11:47:09Z"],["dc.date.issued","2013"],["dc.description.abstract","Among male chacma baboons (Papio hamadryas ursinus), rank positions in the dominance hierarchy are fiercely contested. Physical fighting is costly but relatively rare in this species. Instead, disputes are frequently resolved using displays that include loud, repetitive “wahoo” (two-syllable bark) vocalizations. We previously found that males of all ranks adjust their contest behavior based on the relative fighting ability of opponents and that length of the second syllable (“hoo” duration), calling rate, and fundamental frequency reliably indicate fighting ability. To test whether males indeed attend to hoo duration when assessing opponents, we designed two sets of playback experiments in which call sequence pairs were identical except for this single modified feature. In experiment 1, we used calls recorded from high-ranking males unfamiliar to all subjects. In experiment 2, callers were familiar rivals that ranked one position below subjects in the dominance hierarchy. In paired analyses, subjects in both experiments responded more strongly to sequences with more intense signal features (most commonly associated with high-quality males) compared to sequences with relatively less exaggerated features (most often associated with low-quality males). Results suggest that males can use acoustic features to both indirectly evaluate strangers and to monitor the changing condition of those rivals that present the biggest intragroup threat to their position in the dominance hierarchy. Taken together with our previous research, baboons appear to follow a classic assessor strategy—signal features related to rank and condition are salient to males and directly affect their propensity to respond to rivals."],["dc.identifier.doi","10.1007/s00265-013-1592-8"],["dc.identifier.gro","3150635"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7414"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0340-5443"],["dc.subject","Acoustic communication; Assessor strategy; Game theory; Intrasexual competition; Papio; Playback experiments"],["dc.title","Male baboon responses to experimental manipulations of loud “wahoo calls”: testing an honest signal of fighting ability"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","925"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Animal Behaviour"],["dc.bibliographiccitation.lastpage","931"],["dc.bibliographiccitation.volume","61"],["dc.contributor.author","Fischer, Julia"],["dc.contributor.author","Metz, Markus"],["dc.contributor.author","Cheney, Dorothy L."],["dc.contributor.author","Seyfarth, Robert M."],["dc.date.accessioned","2018-03-08T09:22:19Z"],["dc.date.available","2018-03-08T09:22:19Z"],["dc.date.issued","2001"],["dc.description.abstract","We studied chacma baboons', Papio cynocephalus ursinus, responses to conspecific ‘barks’ in a free-ranging population in the Okavango Delta of Botswana. These barks grade from tonal, harmonically rich calls to calls having a noisier, harsher structure. Tonal or clear barks are typically given when the signaller is at risk of losing contact with the group or when a mother and infant have become separated (‘contact barks’). The harsher variants are given in response to predators (‘alarm barks’). In both contexts, however, we also observed acoustically intermediate forms. Using the habituation–recovery method we tested whether baboons discriminated between (1) clear contact barks versus harsh alarm barks, and (2) clear contact barks versus intermediate alarm barks. Calls were selected according to the results of a discriminant function analysis conducted on a suite of acoustic parameters. In these experiments, animals showed a significant recovery of response only after playback of the harsh alarm call. We performed another set of experiments using single exemplars of clear and intermediate contact barks, or intermediate and harsh alarm barks. Animals responded only to the playback of a harsh alarm bark. Apparently, only this harsh variant was placed in a category that warranted a response. We hypothesize that baboons' responses were to a large degree influenced by their assessment of context."],["dc.identifier.doi","10.1006/anbe.2000.1687"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/12941"],["dc.language.iso","en"],["dc.notes.intern","GRO-Li-Import"],["dc.notes.status","final"],["dc.relation.doi","10.1006/anbe.2000.1687"],["dc.relation.issn","0003-3472"],["dc.title","Baboon responses to graded bark variants"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","140"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Behavioral Ecology and Sociobiology"],["dc.bibliographiccitation.lastpage","148"],["dc.bibliographiccitation.volume","56"],["dc.contributor.author","Fischer, Julia"],["dc.contributor.author","Kitchen, Dawn M."],["dc.contributor.author","Seyfarth, Robert M."],["dc.contributor.author","Cheney, Dorothy L."],["dc.date.accessioned","2018-03-08T09:22:21Z"],["dc.date.available","2018-03-08T09:22:21Z"],["dc.date.issued","2004"],["dc.description.abstract","Free-ranging adult male baboons give loud two-syllable ‘wahoo’ calls during dawn choruses, interactions between groups, when chasing females, and in aggressive interactions with other males. Previous research has shown that the rate and duration of these contest wahoos are correlated with a male’s competitive ability: high-ranking males call more often, call at faster rates, and call for longer bouts than do low-ranking males. Here we report that acoustic features of wahoos also reveal information about male competitive ability. High-ranking males give wahoos with higher fundamental frequencies (F0) and longer ‘hoo’ syllables. Within-subject analyses revealed that, as males fall in rank, the hoo syllables tend to shorten within a period of months. As males age and continue to fall in rank, F0 declines, hoo syllables shorten, and formant dispersion decreases. Independent of age and rank, within bouts of calling F0 declines and hoo syllables become shorter. Because wahoos are often given while males are running or leaping through trees, variation in these acoustic features may function as an indicator of a male’s stamina. The acoustic features of contest wahoos thus potentially allow listeners to assess a male’s competitive ability."],["dc.identifier.doi","10.1007/s00265-003-0739-4"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/12956"],["dc.language.iso","en"],["dc.notes.intern","GRO-Li-Import"],["dc.notes.status","final"],["dc.relation.doi","10.1007/s00265-003-0739-4"],["dc.relation.eissn","1432-0762"],["dc.relation.issn","0340-5443"],["dc.relation.issn","1432-0762"],["dc.title","Baboon loud calls advertise male quality: acoustic features and their relation to rank, age, and exhaustion"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Animal Behaviour"],["dc.bibliographiccitation.lastpage","8"],["dc.bibliographiccitation.volume","80"],["dc.contributor.author","Seyfarth, Robert M."],["dc.contributor.author","Cheney, Dorothy L."],["dc.contributor.author","Bergman, Thore J."],["dc.contributor.author","Fischer, Julia"],["dc.contributor.author","Zuberbühler, Klaus"],["dc.contributor.author","Hammerschmidt, Kurt"],["dc.date.accessioned","2017-09-07T11:47:40Z"],["dc.date.available","2017-09-07T11:47:40Z"],["dc.date.issued","2010"],["dc.description.abstract","The concept of information plays a central role in studies of animal communication. Animals’ responses to the calls of different individuals, to food calls, alarm calls, and to signals that predict behaviour, all suggest that recipients acquire information from signals and that this information affects their response. Some scientists, however, want to replace the concept of information with one based on the ‘manipulation’ of recipients by signallers through the induction of nervous-system responses. Here we review both theory and data that argue against hypotheses based exclusively on manipulation or on a fixed, obligatory link between a signal’s physical features and the responses it elicits. Results from dozens of studies indicate that calls with ‘arousing’ or ‘aversive’ features may also contain information that affects receivers’ responses; that acoustically similar calls can elicit different responses; acoustically different calls can elicit similar responses; and ‘eavesdropping’ animals respond to the relationship instantiated by signal sequences. Animal signals encode a surprisingly rich amount of information. The content of this information can be studied scientifically."],["dc.identifier.doi","10.1016/j.anbehav.2010.04.012"],["dc.identifier.gro","3150672"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7455"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0003-3472"],["dc.subject","animal communication; animal signal; information; information transmission; language; meaning"],["dc.title","The central importance of information in studies of animal communication"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2317"],["dc.bibliographiccitation.issue","1459"],["dc.bibliographiccitation.journal","Proceedings of the Royal Society B: Biological Sciences"],["dc.bibliographiccitation.lastpage","2321"],["dc.bibliographiccitation.volume","267"],["dc.contributor.author","Fischer, Julia"],["dc.contributor.author","Cheney, Dorothy L."],["dc.contributor.author","Seyfarth, Robert M."],["dc.date.accessioned","2018-03-08T09:22:21Z"],["dc.date.available","2018-03-08T09:22:21Z"],["dc.date.issued","2000"],["dc.description.abstract","We studied the development of infant baboon’ (Papio cynocephalus ursinus) responses to conspecific‘bark’ in a free–ranging population in the Okavango Delta, Botswana. These barks grade from tonal, harmonically rich calls into calls with a more noisy, harsh structure. Typically, tonal variants are given when the signaller is at risk of losing contact with the group or a particular individual ‘contact bark’), whereas harsh variants are given in response to predators ‘alarm bark’). We conducted focal observations and playback experiments in which we presented variants of barks recorded from resident adult females. By six months of age, infants reliably discriminated between typical alarm and contact barks and they responded more strongly to intermediate alarm calls than to typical contact barks. Infants of six months and older also recognized their mothers by voice. The ability to discriminate between different call variants developed with increasing age. At two and a half months of age, infants failed to respond at all, whereas at four months they responded irrespective of the call type that was presented. At six months, infants showed adult–like responses by responding strongly to alarm barks but ignoring contact barks. We concluded that infants gradually learn to attach the appropriate meaning to alarm and contact barks."],["dc.identifier.doi","10.1098/rspb.2000.1285"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/12952"],["dc.language.iso","en"],["dc.notes.intern","GRO-Li-Import"],["dc.notes.status","final"],["dc.relation.doi","10.1098/rspb.2000.1285"],["dc.relation.issn","0962-8452"],["dc.relation.issn","1471-2954"],["dc.title","Development of infant baboons' responses to graded bark variants"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]