Hodges, J. Keith

[["dc.bibliographiccitation.firstpage","74"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Folia Primatologica"],["dc.bibliographiccitation.lastpage","82"],["dc.bibliographiccitation.volume","80"],["dc.contributor.author","Hadi, Susilo"],["dc.contributor.author","Ziegler, Thomas"],["dc.contributor.author","Hodges, J. Keith"],["dc.date.accessioned","2018-11-07T08:34:30Z"],["dc.date.available","2018-11-07T08:34:30Z"],["dc.date.issued","2009"],["dc.description.abstract","We present data on group structure and physical characteristics from free-ranging Simias concolor. Mean group size (n = 3) was 8.7 +/- 1.1 individuals with an average adult male: female sex ratio of 1:3. All individuals were sexed and allocated into three categories (infants, juveniles plus subadults and adults) on the basis of their physical development. Within age categories, head-body lengths ranged from 19.6 to 25, 34 to 44 and 42 to 53 cm. Corresponding body weights ranged from 0.5 to 0.9, 2.35 to 4.4 and 5.2 to 7.85 kg, respectively; on average adult males were 13% larger and 23% heavier than adult females. Results indicate that for S. concolor living in undisturbed habitat (i) group sizes are larger than previously reported and (ii) polygyny is the most likely mating system. Both results support an earlier proposal that group size and social organization in Simakobu monkey are related to the degree of habitat disturbance. Copyright (C) 2009 S. Karger AG, Basel"],["dc.description.sponsorship","Bogor Agricultural University (IBP)"],["dc.identifier.doi","10.1159/000214226"],["dc.identifier.isi","000268600600003"],["dc.identifier.pmid","19390200"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/9320"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17832"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Karger"],["dc.relation.issn","0015-5713"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Group Structure and Physical Characteristics of Simakobu Monkeys (Simias concolor) on the Mentawai Island of Siberut, Indonesia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","32028"],["dc.bibliographiccitation.journal","Scientific reports"],["dc.bibliographiccitation.volume","6"],["dc.contributor.author","Marty, Pascal R."],["dc.contributor.author","Hodges, Keith"],["dc.contributor.author","Agil, Muhammad"],["dc.contributor.author","Engelhardt, Antje"],["dc.date.accessioned","2019-07-09T11:42:48Z"],["dc.date.available","2019-07-09T11:42:48Z"],["dc.date.issued","2016"],["dc.description.abstract","Immigration into a new group can produce substantial costs due to resistance from residents, but also reproductive benefits. Whether or not individuals base their immigration strategy on prospective cost-benefit ratios remains unknown. We investigated individual immigration decisions in crested macaques, a primate species with a high reproductive skew in favour of high-ranking males. We found two different strategies. Males who achieved low rank in the new group usually immigrated after another male had immigrated within the previous 25 days and achieved high rank. They never got injured but also had low prospective reproductive success. We assume that these males benefitted from immigrating into a destabilized male hierarchy. Males who achieved high rank in the new group usually immigrated independent of previous immigrations. They recieved injuries more frequently and therefore bore immigration costs. They, however, also had higher reproductive success prospects. We conclude that male crested macaques base their immigration strategy on relative fighting ability and thus potential rank in the new group i.e. potential reproductive benefits, as well as potential costs of injury."],["dc.identifier.doi","10.1038/srep32028"],["dc.identifier.pmid","27535622"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13749"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/58749"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","2045-2322"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Determinants of immigration strategies in male crested macaques (Macaca nigra)."],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","137"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","SpringerPlus"],["dc.bibliographiccitation.volume","2"],["dc.contributor.author","Richter, Christin"],["dc.contributor.author","Taufiq, Ahmad"],["dc.contributor.author","Hodges, Keith"],["dc.contributor.author","Ostner, Julia"],["dc.contributor.author","Schülke, Oliver"],["dc.date.accessioned","2017-09-07T11:54:39Z"],["dc.date.available","2017-09-07T11:54:39Z"],["dc.date.issued","2013"],["dc.description.abstract","Logging and forest loss continues to be a major problem within Southeast Asia and as a result, many species are becoming threatened or extinct. The present study provides the first detailed and comprehensive ecological data on the Siberut macaque (Macaca siberu), a primate species living exclusively on the island of Siberut off the west coast of Sumatra. Our results show that M. siberu is ecologically similar to its closest relative M. nemestrina occurring on the mainland, both species being semi-terrestrial, mainly frugivorous (75-76%), exhibit a large daily travel distance for their group size and spend more time on traveling than any other macaque species. The habitat of Siberut macaques was floristically very diverse (Simpson’s index D=0.97), although somewhat impoverished in tree species richness, and had a lower tree basal area and a lower rattan density compared to other forests in Malesia (both rattan and palm tree fruit being an important food resource for Macaca siberu due to their long fruiting periods). These factors may lead to a lower diversity and abundance of fruit resources, and coupled with a high degree of frugivory of Siberut macaques, may explain the large amount of traveling observed in this species. The large home range requirements and strong dependence on fruit are important factors that need to be considered when developing conservation measures for this IUCN-listed (Category Vulnerable) species."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2013"],["dc.identifier.doi","10.1186/2193-1801-2-137"],["dc.identifier.gro","3151459"],["dc.identifier.pmid","23724365"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10427"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/8262"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","2193-1801"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Ecology of an endemic primate species (Macaca siberu) on Siberut Island, Indonesia"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","290"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Oryx"],["dc.bibliographiccitation.lastpage","297"],["dc.bibliographiccitation.volume","46"],["dc.contributor.author","Palacios, Juan Francisco Gallardo"],["dc.contributor.author","Engelhardt, Antje"],["dc.contributor.author","Agil, Muhammad"],["dc.contributor.author","Hodges, Keith"],["dc.contributor.author","Bogia, Roger"],["dc.contributor.author","Waltert, Matthias"],["dc.date.accessioned","2018-11-07T09:11:25Z"],["dc.date.available","2018-11-07T09:11:25Z"],["dc.date.issued","2012"],["dc.description.abstract","The crested black macaque Macaca nigra, endemic to Sulawesi, Indonesia, is categorized as Critically Endangered on the IUCN Red List and its population in the Tangkoko Nature Reserve is probably the only viable one within its native range. Earlier studies suggested that this population suffered a decline of 75% during 1978-1994. To evaluate its current status we conducted a line transect survey in the Reserve and assessed effects of ecological and anthropogenic variables on macaque abundance and distribution. We estimated a density of 44.9 individuals km(-2) (95% confidence interval, CI, 25.6-78.8) and a total population of 1,951 individuals (CI 1,113-3,421). This estimate of density is 35% lower than that of 68.7 individuals km(-2) in 1994. There were moderate to strong correlations between macaque abundance and vegetation structure (basal area and canopy tree density). We observed illegal logging in the area and therefore habitat quality for macaques may be indirectly affected by illegal human activities. If our population estimate is projected linearly M. nigra could become extinct in Tangkoko within 46 years, highlighting the urgent need to improve management of illegal hunting and logging in the Reserve."],["dc.description.sponsorship","Volkswagen Foundation, Germany; German Research Council (DFG) [EN 719/2]"],["dc.identifier.doi","10.1017/S0030605311000160"],["dc.identifier.isi","000303837100026"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10159"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26718"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Cambridge Univ Press"],["dc.relation.issn","0030-6053"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Status of, and conservation recommendations for, the Critically Endangered crested black macaque Macaca nigra in Tangkoko, Indonesia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e83131"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","PLoS ONE"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Erb, Wendy M."],["dc.contributor.author","Hodges, J. Keith"],["dc.contributor.author","Hammerschmidt, Kurt"],["dc.date.accessioned","2019-07-09T11:54:41Z"],["dc.date.available","2019-07-09T11:54:41Z"],["dc.date.issued","2013-12-23"],["dc.description.abstract","Primate loud calls have the potential to encode information about the identity, arousal, age, or physical condition of the caller, even at long distances. In this study, we conducted an analysis of the acoustic features of the loud calls produced by a species of Asian colobine monkey (simakobu, Simias concolor). Adult male simakobu produce loud calls spontaneously and in response to loud sounds and other loud calls, which are audible more than 500 m. Individual differences in calling rates and durations exist, but it is unknown what these differences signal and which other acoustic features vary among individuals. We aimed to describe the structure and usage of calls and to examine acoustic features that vary within and among individuals. We determined the context of 318 loud calls and analyzed 170 loud calls recorded from 10 adult males at an undisturbed site, Pungut, Siberut Island, Indonesia. Most calls (53%) followed the loud call of another male, 31% were spontaneous, and the remaining 16% followed a loud environmental disturbance. The fundamental frequency (F0) decreased while inter-unit intervals (IUI) increased over the course of loud call bouts, possibly indicating caller fatigue. Discriminant function analysis indicated that calls were not well discriminated by context, but spontaneous calls had higher peak frequencies, suggesting a higher level of arousal. Individual calls were distinct and individuals were mainly discriminated by IUI, call duration, and F0. Loud calls of older males had shorter IUI and lower F0, while middle-aged males had the highest peak frequencies. Overall, we found that calls were individually distinct and may provide information about the age, stamina, and arousal of the calling male, and could thus be a way for males and females to assess competitors and mates from long distances."],["dc.format.extent","11"],["dc.identifier.doi","10.1371/journal.pone.0083131"],["dc.identifier.fs","600022"],["dc.identifier.pmid","24376651"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/9575"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60709"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","1932-6203"],["dc.rights","CC BY 2.5"],["dc.rights.uri","https://creativecommons.org/licenses/by/2.5"],["dc.title","Individual, Contextual, and Age-Related Acoustic Variation in Simakobu (Simias concolor) Loud Calls"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]