Maciej, Peter

[["dc.bibliographiccitation.artnumber","e23015"],["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","PLoS ONE"],["dc.bibliographiccitation.lastpage","10"],["dc.bibliographiccitation.volume","6"],["dc.contributor.author","Maciej, Peter"],["dc.contributor.author","Fischer, Julia"],["dc.contributor.author","Hammerschmidt, Kurt"],["dc.contributor.editor","Reby, David"],["dc.date.accessioned","2017-09-07T11:47:42Z"],["dc.date.available","2017-09-07T11:47:42Z"],["dc.date.issued","2011"],["dc.description.abstract","Acoustic analyses have become a staple method in field studies of animal vocal communication, with nearly all investigations using computer-based approaches to extract specific features from sounds. Various algorithms can be used to extract acoustic variables that may then be related to variables such as individual identity, context or reproductive state. Habitat structure and recording conditions, however, have strong effects on the acoustic structure of sound signals. The purpose of this study was to identify which acoustic parameters reliably describe features of propagated sounds. We conducted broadcast experiments and examined the influence of habitat type, transmission height, and re-recording distance on the validity (deviation from the original sound) and reliability (variation within identical recording conditions) of acoustic features of different primate call types. Validity and reliability varied independently of each other in relation to habitat, transmission height, and re-recording distance, and depended strongly on the call type. The smallest deviations from the original sounds were obtained by a visually-controlled calculation of the fundamental frequency. Start- and end parameters of a sound were most susceptible to degradation in the environment. Because the recording conditions can have appreciable effects on acoustic parameters, it is advisable to validate the extraction method of acoustic variables from recordings over longer distances before using them in acoustic analyses."],["dc.identifier.doi","10.1371/journal.pone.0023015"],["dc.identifier.gro","3150688"],["dc.identifier.pmid","21829682"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8334"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7472"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.relation.issn","1932-6203"],["dc.rights","CC BY 2.5"],["dc.rights.uri","https://creativecommons.org/licenses/by/2.5"],["dc.title","Transmission Characteristics of Primate Vocalizations: Implications for Acoustic Analyses"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e0143100"],["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","PLOS ONE"],["dc.bibliographiccitation.lastpage","13"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Knauf, Sascha"],["dc.contributor.author","Barnett, Ulrike"],["dc.contributor.author","Maciej, Peter"],["dc.contributor.author","Klapproth, Matthias"],["dc.contributor.author","Ndao, Ibrahima"],["dc.contributor.author","Frischmann, Sieghard"],["dc.contributor.author","Fischer, Julia"],["dc.contributor.author","Zinner, Dietmar"],["dc.contributor.author","Liu, Hsi"],["dc.contributor.editor","Hassan, Imtaiyaz"],["dc.date.accessioned","2017-09-07T11:47:08Z"],["dc.date.available","2017-09-07T11:47:08Z"],["dc.date.issued","2015"],["dc.description.abstract","The bacterium Treponema pallidum is known to cause syphilis (ssp. pallidum), yaws (ssp. pertenue), and endemic syphilis (ssp. endemicum) in humans. Nonhuman primates have also been reported to be infected with the bacterium with equally versatile clinical manifestations, from severe skin ulcerations to asymptomatic. At present all simian strains are closely related to human yaws-causing strains, an important consideration for yaws eradication. We tested clinically healthy Guinea baboons (Papio papio) at Parc National Niokolo Koba in south eastern Senegal for the presence of anti-T. pallidum antibodies. Since T. pallidum infection in this species was identified 50 years ago, and there has been no attempt to treat non-human primates for infection, it was hypothesized that a large number of West African baboons are still infected with simian strains of the yaws-bacterium. All animals were without clinical signs of treponematoses, but 18 of 20 (90%) baboons tested positive for antibodies against T. pallidum based on treponemal tests. Yet, Guinea baboons seem to develop no clinical symptoms, though it must be assumed that infection is chronic or comparable to the latent stage in human yaws infection. The non-active character is supported by the low anti-T. pallidum serum titers in Guinea baboons (median = 1:2,560) versus serum titers that are found in genital-ulcerated olive baboons with active infection in Tanzania (range of medians among the groups of initial, moderate, and severe infected animals = 1:15,360 to 1:2.097e+7). Our findings provide evidence for simian infection with T. pallidum in wild Senegalese baboons. Potentially, Guinea baboons in West Africa serve as a natural reservoir for human infection, as the West African simian strain has been shown to cause sustainable yaws infection when inoculated into humans. The present study pinpoints an area where further research is needed to support the currently on-going second WHO led yaws eradication campaign with its goal to eradicate yaws by 2020."],["dc.identifier.doi","10.1371/journal.pone.0143100"],["dc.identifier.gro","3150630"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12553"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7409"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","1932-6203"],["dc.rights.access","openAccess"],["dc.subject","Baboons; Treponema pallidum; Guinea; Yaws; Lesions; Primates; Senegal´; Antibodies"],["dc.title","High Prevalence of Antibodies against the Bacterium Treponema pallidum in Senegalese Guinea Baboons (Papio papio)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","61"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Behavioral Ecology and Sociobiology"],["dc.bibliographiccitation.lastpage","68"],["dc.bibliographiccitation.volume","67"],["dc.contributor.author","Maciej, Peter"],["dc.contributor.author","Patzelt, Annika"],["dc.contributor.author","Ndao, Ibrahima"],["dc.contributor.author","Hammerschmidt, Kurt"],["dc.contributor.author","Fischer, Julia"],["dc.date.accessioned","2017-09-07T11:47:07Z"],["dc.date.available","2017-09-07T11:47:07Z"],["dc.date.issued","2013"],["dc.description.abstract","Keeping track of social interactions among conspecifics is a driving force for the evolution of social cognition. How social cognition, such as social knowledge, ties in with a species' social organization is, however, largely unexplored. We investigated the social knowledge of wild Guinea baboons (Papio papio) ranging in Senegal, a species that lives in a fluid multilevel society with overlapping habitat use. Using playback experiments, we tested how adult males differentiate between subjects from their own vs. a neighboring or a stranger social unit (\"gang\") and assessed ranging patterns with Global Positioning System (GPS) data. While territorial species usually differentiate between group and nongroup members and often respond more strongly to strangers than neighbors (the \"dear enemy\" effect), subjects in this highly tolerant species should largely ignore other unit members and mainly attend to subjects from their own unit. Males responded strongly after playback of calls recorded from members of their own gang, while they attended only briefly to neighbor or stranger calls. Apparently, males benefit from monitoring the social maneuvers in their own social unit, while it remains to be resolved whether they are unmotivated or unable to keep track of the identities and actions of individuals outside their own gang. The study highlights how the allocation of social attention is tuned to the specifics of a species' social organization, while a complex social organization does not necessarily translate into the need for more elaborate social knowledge."],["dc.identifier.doi","10.1007/s00265-012-1425-1"],["dc.identifier.gro","3150622"],["dc.identifier.pmid","23293423"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10980"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7400"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.relation.issn","0340-5443"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Social monitoring in a multilevel society: a playback study with male Guinea baboons"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]