Calling in wild silvery gibbons (Hylobates moloch) in Java (Indonesia): behavior, phylogeny, and conservation

@article{Geissmann2006CallingIW,
  title={Calling in wild silvery gibbons (Hylobates moloch) in Java (Indonesia): behavior, phylogeny, and conservation},
  author={Thomas Geissmann and Vincent Nijman},
  journal={American Journal of Primatology},
  year={2006},
  volume={68}
}
Hardly any behavioral data are available for the silvery gibbon (Hylobates moloch), an endangered primate that is endemic to the island of Java, Indonesia. We studied the singing behavior of the easternmost population of this species in the Dieng mountains, central Java, in 1998–1999. We aimed to document the timing of singing, quantify the amount of singing by the respective sexes, and explore the role of bioacoustics in density estimation. A total of 122 song bouts in at least 12 groups were… 
Individual and Geographical Variability in the Songs of Wild Silvery Gibbons (Hylobates Moloch) on Java, Indonesia
TLDR
The aim of this study is to answer the following questions: to what degree is great-call variability within a species useful for both individual and population identification and to test the validity of subspecific taxon boundaries suggested by previously reported genetic data.
Singing Patterns of White-Cheeked Gibbons (Nomascus sp.) in the Annamite Mountains of Laos
TLDR
Songs of white-cheeked gibbons (Nomascus sp.) are recorded from listening posts at a site in Nakai–Nam Theun National Protected Area, central-eastern Laos, during a cold dry and a warm dry season, and a significant negative relationship between the number of song bouts heard and temperature is found.
Singing by male and female Kloss gibbons (Hylobates klossii) in the Peleonan Forest, Siberut Island, Indonesia
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This study supports the hypothesis that male and female songs function in intrasexual resource defence, as singing is associated with singing bySame-sex neighbours, and same-sex choruses are more likely to occur after one or more days of silence (from that sex), suggesting there is pressure for individuals to communicate with same- sex neighbours regularly.
DAILY ACTIVITY OF JUVENILE JAVAN GIBBON (Hylobates moloch AUDEBERT 1798) IN GUNUNG HALIMUN SALAK NATIONAL PARK
Javan gibbon (Hylobates moloch) is one of endemic primates in Java Island, which listed as endangered and facing the high risk of extinction. Conservation efforts need to be taken immediately in
Geographic variation in loud calls of sportive lemurs (Lepilemur ssp.) and their implications for conservation
TLDR
It is revealed that loud calls separated geographically isolated populations of sportive lemurs specifically, and noninvasive tools for diagnosis and monitoring of cryptic species in nature can be developed for conservation management.
Female Songs of the Nonduetting Javan Gibbons (Hylobates moloch) Function for Territorial Defense
Duets in territorial, pair-living primates may function to maintain intragroup cohesion, promote intergroup avoidance, and assist in territorial and resource defense, as well as advertising and
Diet and ranging behavior of the endangered Javan gibbon (Hylobates moloch) in a submontane tropical rainforest
TLDR
The results suggest that Javan gibbons in higher elevation habitats have substantially larger home ranges than lowland populations, despite broad similarity in their activity budgets and diets.
Calling patterns of Western purple-faced langurs (Mammalia: Primates: Cercopithecidea: Trachypithecus vetulus nestor) in a degraded human landscape in Sri Lanka
TLDR
Results show that vocalisations can be used to distinguish individual males; as langurs are more often heard than seen, and most troops contain only a single adult male, vocalisations may beused to determine the number of troops in an area.
Kloss gibbon (Hylobates klossii) behavior facilitates the avoidance of human predation in the Peleonan forest, Siberut Island, Indonesia
TLDR
It is argued that behaviors that may reduce the risk of predation by humans during singing (the most conspicuous gibbon behavior), daily non‐singing activities and encounters with humans, and a coordinated response to the presence of humans are an evolved response to a long history of predations by humans.
Concordance between vocal and genetic diversity in crested gibbons
TLDR
The results show that the structure of crested gibbon songs is not only a reliable tool to verify phylogenetic relatedness, but also to unravel geographic origins as vocal production in other nonhuman primate species appears to be evolutionarily based.
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