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5 - Demography of a Stable Gibbon Population in High-Elevation Forest on Java

Published online by Cambridge University Press:  13 April 2023

By
Susan Lappan ,
Rahayu Oktaviani ,
Ahyun Choi ,
Soojung Ham ,
Haneul Jang ,
Sanha Kim ,
Yoonjung Yi ,
Ani Mardiastuti  and
Jae Chun Choe
Edited by
Susan M. Cheyne ,
Carolyn Thompson ,
Peng-Fei Fan  and
Helen J. Chatterjee
Susan M. Cheyne
Affiliation:
Borneo Nature Foundation
Carolyn Thompson
Affiliation:
University College London
Peng-Fei Fan
Affiliation:
Sun Yat-Sen University, China
Helen J. Chatterjee
Affiliation:
University College London
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Summary

Demography is fundamental for conservation planning, but important information is often lacking. Here, we describe the demography of wild Javan gibbons (Hylobates moloch) from 2007 to 2020 in Citalahab Research Area, Gunung Halimun-Salak National Park, Indonesia. Mean group size was 3.95 ± 0.78 individuals. All groups (n = 8) included an adult pair and 0–3 immature individuals. All adults survived throughout the study, indicating that the lifespans of paired adults exceeded 24 years. Births occurred throughout the year, with intervals of 3.65 ± 0.70 years between births. Age-specific survivorship was 1.0 from birth to age 4 years (n = 12), 0.83 for 4–6 year olds (n = 6) and 1.0 for 6–8 year olds (n = 2). Six individuals disappeared between ages 4 and 10 years. One juvenile male (<5 years) is assumed to have died. One male disappeared at age 5.2 years. Four sub-adults (>8 years) experienced increasing aggression from same-sex adults before disappearing. The fates of dispersing individuals are unknown. Gibbon demography at Citalahab was similar to that of stable gibbon populations at other sites, although Citalahab is in submontane forest on a habitat edge. Most remaining Javan gibbons live in fragmented hill and montane forests, so demographic parameters from Citalahab may be helpful in population modelling for this species.

Keywords

silvery gibbondemographyvital ratesage-specific mortality
Type
Chapter
Information
Gibbon Conservation in the Anthropocene , pp. 78 - 103
Publisher: Cambridge University Press
Print publication year: 2023

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References

Amonge, D.E., Kumar, A. and Sharma, M. (2017). Reproductive biology of eastern hoolock gibbon Hoolock leuconedys in conservation breeding centre. International Journal of Zoological Research, 13: 93–104.CrossRefGoogle Scholar
Andayani, N., Morales, J.C., Forstner, M.R.J., Supriatna, J. and Melnick, D.J. (2001). Genetic variability in mtDNA of the silvery gibbon: implications for the conservation of a critically endangered species. Conservation Biology, 15: 770–775.CrossRefGoogle Scholar
Arcus Foundation. (2018). State of the Apes: Infrastructure Development and Ape Conservation (Abundance Annex). Cambridge University Press, Cambridge. Available at www.stateoftheapes.com.Google Scholar
Balai Taman Negara Gede Pangrango. (2011). Inventarisasi Owa Jawa (Hylobates moloch) di dua lokasi (SSWK Bodogol dan SSWK Selabintana) Taman Nasional Gunung Gede Pangrango. In Ario, A., Supriatna, J. and Andayani, N. (eds.), Owa Jawa di Taman Nasional Gunung Gede Pangrango. Conservation International, Jakarta, Indonesia: 126–141.Google Scholar
Barca, B., Vincent, C., Soeung, K., Nuttall, M. and Hobson, K. (2016). Multi-female group in the southernmost species of Nomascus: field observations in eastern Cambodia reveal mulltiple breeding females in a single group of southern yellow-cheeked crested gibbons Nomascus gabriellae. Asian Primates Journal, 6: 15–19.Google Scholar
Barelli, C., Heistermann, M., Boesch, C. and Reichard, U. (2007). Sexual swellings in wild white-handed gibbon females (Hylobates lar) indicate the probability of ovulation. Hormones and Behavior, 51: 221–230.Google Scholar
Bartlett, T.Q. (2011). The Hylobatidae. In Campbell, C.J., Fuentes, A., MacKinnon, K.C., Panger, M. and Bearder, S.K. (eds.), Primates in Perspective, 2nd ed. Oxford University Press, Oxford: 300–312.Google Scholar
Benchimol, M. and Peres, C.A. (2015). Widespread forest vertebrate extinctions induced by a mega hydroelectric dam in lowland Amazonia. PLoS One, 10: e0129818.Google Scholar
Bleisch, W.V. and Chen, N. (1991). Ecology and behaviour of wild black-crested gibbons (Hylobates concolor) in China with a reconsideration of evidence for polygyny. Primates, 32: 539–548.Google Scholar
Brockelman, W.Y. and Srikosamatara, S. (1993). Estimation of density of gibbon groups by use of loud songs. American Journal of Primatology, 29: 93–108.Google Scholar
Brockelman, W.Y., Reichard, U., Treesucon, U. and Raemaekers, J.J. (1998). Dispersal, pair formation and social structure in gibbons (Hylobates lar). Behavioral Ecology and Sociobiology, 42: 329–339.Google Scholar
Brockman, D.K. and van Schaik, C.P. (2005). Seasonality and reproductive function. In Brockman, D.K. and van Schaik, C.P. (eds.), Seasonality in Primates: Studies of Living and Extinct Human and Non-Human Primates. Cambridge University Press, Cambridge: 269–303.CrossRefGoogle Scholar
Bryant, J.V., Brulé, A., Wong, M.H.G., et al. (2016). Detection of a new Hainan gibbon (Nomascus hainanus) group using acoustic call playback. International Journal of Primatology, 37: 534–547.Google Scholar
Burns, B. and Judge, D.S. (2011). The varied path to adulthood: plasticity in developmental timing in hylobatids. American Journal of Primatology, 78: 610–625.CrossRefGoogle Scholar
Caldecott, J.O. (1980). Habitat quality and populations of two sympatric gibbons (Hylobatidae) on a mountain in Malaya. Folia Primatologica, 33: 291–301.Google Scholar
Cheyne, S.M., Thompson, C.J.H., Phillips, A.C., Hill, R.M.C. and Limin, S.H. (2008). Density and population estimates of gibbons (Hylobates albibarbis) in the Sebangau catchment, Central Kalimantan, Indonesia. Primates, 49: 50–56.Google Scholar
Cheyne, S.M., Capillla, B.R., Abdulaziz, , et al. (2019). Home range variation and site fidelity of Bornean southern gibbons [Hylobates albibarbis] from 2010–2018. PLoS One, 14: e0217784.Google Scholar
Chivers, D.J. (1974). The Siamang in Malaya: A Field Study of a Primate in Tropical Rain Forest. Contributions to Primatology Vol. 4. Karger, Basel.Google Scholar
Chivers, D.J. and Raemaekers, J.J. (1980). Long-term changes in behaviour. In Chivers, D.J. (ed.), Malayan Forest Primates. Springer, New York: 209–260.Google Scholar
Choudhury, A. (1990). Population dynamics of hoolock gibbons (Hylobates hoolock) in Assam, India. American Journal of Primatology, 20: 37–41.Google Scholar
Corlett, R.T. (2007). The impact of hunting on the mammalian fauna of tropical Asian forests. Biotropica, 39: 292–303.Google Scholar
Deacon, J.N. and Mac Nally, R. (1998). Local extinction and nestedness of small-mammal faunas in fragmented forest of central Victoria, Australia. Pacific Conservation Biology, 4: 122–131.Google Scholar
Deng, H., Zhang, M. and Zhou, J. (2016). Recovery of the critically endangered Hainan gibbon Nomascus hainanus. Oryx, 51: 161–165.Google Scholar
DeWalt, S.J., Schnitzer, S., Chave, J., et al. (2010). Annual rainfall and seasonality predict pan‐tropical patterns of liana density and basal area. Biotropica, 42: 309–317.CrossRefGoogle Scholar
Dooley, H.M. and Judge, D.S. (2015). Kloss gibbon (Hylobates klossii) behavior facilitates the avoidance of human predation in the Peleonan Forest, Siberut Island, Indonesia. American Journal of Primatology, 77: 296–308.Google Scholar
Estrada, A. and Coates-Estrada, R. (1988). Tropical rain forest conversion and perspectives in the conservation of wild primates (Alouatta and Ateles) in Mexico. American Journal of Primatology, 14: 315–327.Google Scholar
Fan, P., Jiang, X., Liu, C. and Luo, W. (2006). Polygynous mating system and behavioural reason of black crested gibbon (Nomascus concolor jingdongensis) at Dazhaizi, Mt. Wuliang, Yunnan, China. Zoological Research, 27: 216–220.Google Scholar
Fan, P., Ni, Q., Sun, G., Huang, B. and Jiang, X. (2009a). Gibbons under seasonal stress: the diet of the black crested gibbon (Nomascus concolor) on Mt. Wuliang, Central Yunnan, China. Primates, 50: 37–44.Google Scholar
Fan, P., Jiang, X. and Tian, C. (2009b). The critically endangered black crested gibbon Nomascus concolor on Wuliang Mountain, Yunnan, China: the role of forest types in the species’ conservation. Oryx, 43: 203–208.Google Scholar
Fan, P., Fei, H., Xiang, Z., et al. (2010). Social structure and group dynamics of the Cao vit gibbon (Nomascus nasutus) in Bangliang, Jingxi, China. Folia Primatologica, 81: 245–253.Google Scholar
Fan, P., Fei, H. and Ma, C. (2012). Behavioral responses of Cao vit gibbon (Nomascus nasutus) to variations in food abundance and temperature in Bangliang, Jingxi, China. American Journal of Primatology, 74: 632–641.Google Scholar
Fan, P., Ai, H.S., Fei, H., Zhang, D. and Yuan, S. (2013). Seasonal variation of diet and time budget of eastern hoolock gibbons (Hoolock leuconedys) living in a northern montane forest. Primates, 54: 137–146.Google Scholar
Fan, P., Bartlett, T.Q., Fei, H., Ma, C. and Zhang, W. (2015). Understanding stable bi-female grouping in gibbons: feeding competition and reproductive success. Frontiers in Zoology, 12: 5.Google Scholar
Finkelstein, M.E., Wolf, S., Goldman, M., et al. (2010). The anatomy of a (potential) disaster: volcanoes, behavior, and population viability of the short-tailed albatross (Phoebastria albatrus). Biological Conservation, 143: 321–333.Google Scholar
Fuentes, A. (2000). Hylobatid communities: changing views on pair bonding and social organization in hominoids. Yearbook of Physical Anthropology, 43: 33–60.Google Scholar
Geissmann, T. (1991). A reassessment of age at sexual maturity in gibbons (Hylobates spp.). American Journal of Primatology, 23: 11–22.Google Scholar
Guan, Z., Ma, C., Fei, H., et al. (2018). Ecology and social system of northern gibbons living in cold seasonal forests. Zoological Research, 39: 255–265.Google Scholar
Ham, S., Hedwig, D., Lappan, S. and Choe, J. (2016). Song functions in nonduetting gibbons: evidence from playback experiments on Javan gibbons (Hylobates moloch). International Journal of Primatology, 37: 225–240.Google Scholar
Ham, S., Lappan, S., Hedwig, D. and Choe, J.C. (2017). Female songs of the nonduetting Javan gibbons (Hylobates moloch) function for territorial defense. International Journal of Primatology, 38: 533–552.Google Scholar
Harrison, R.D., Hamid, A.A., Kenta, T., et al. (2003). The diversity of hemi-epiphytic figs (Ficus; Moraceae) in a Bornean lowland rain forest. Biological Journal of the Linnean Society, 78: 439–455.Google Scholar
Hodgkiss, S., Thetford, E., Wiatt, C.D. and Nijman, V. (2010). Female reproductive parameters in the Javan gibbon (Hylobates moloch). Zoo Biology, 29: 449–465.Google Scholar
Hu, N. Guan, Z., Huang, B., et al. (2018). Dispersal and female philopatry in a long‐term, stable, polygynous gibbon population: evidence from 16 years field observation and genetics. American Journal of Primatology, 80(9): e22922.CrossRefGoogle Scholar
Huang, B., Guan, Z., Ni, Q., et al. (2013). Observations of intra-group and extra-group copulation and reproductive characters in free ranging groups of western crested gibbon (Nomascus concolor jingdongensis). Integrative Zoology, 8: 427–440.CrossRefGoogle ScholarPubMed
Iskandar, E. (2007). Habitat dan populasi owa jawa (Hylobates moloch Audebert, 1797) di Taman Nasional Gunung Halimun-Salak, Jawa Barat. PhD dissertation, Institut Pertanian Bogor.Google Scholar
Iskandar, E., Sinarga, W., Riendriasari, S., et al. (2018). Survey of the Javan gibbons (Hylobates moloch) in west and central Java, Indonesia. Biological Systems Open Access, 7(1): 184.CrossRefGoogle Scholar
IUCN (2020). The IUCN Red List of Endangered Species. Version 2020-2. Available at www.iucnredlist.org.Google Scholar
Jablonski, N.G. and Chaplin, G. (2009). The fossil record of gibbons. In Lappan, S. and Whittaker, D.J. (eds.), The Gibbons: New Perspectives on Small Ape Socioecology and Population Biology. Springer, New York: 111–131.Google Scholar
Jang, H. (2014). Visiting behavior of Javan gibbons (Hylobates moloch) to preferred plant species with the use of phenological knowledge. PhD thesis, Ewha Womans University, Seoul, South Korea.Google Scholar
Jiang, X., Luo, Z., Zhao, S., Li, R. and Liu, C. (2006). Status and distribution patterns of black crested gibbon (Nomascus concolor jingdongensis) in Wuliang Mountains, Yunnan, China: implications for conservation. Primates, 47: 264–271.CrossRefGoogle ScholarPubMed
Johns, A.G. and Johns, B.G. (1995). Tropical forest primates and logging: long-term coexistence? Oryx, 29: 205–211.Google Scholar
Kappeler, M. (1984). Diet and feeding behaviour of the moloch gibbon. In Preuschoft, H., Chivers, D.J., Brockelman, W.Y. and Creel, N. (eds.), The Lesser Apes: Evolutionary and Behavioural Biology. Edinburgh University Press, Edinburgh: 228–241.Google Scholar
Kim, S., Lappan, S. and Choe, J.C. (2011). Diet and ranging behavior of the endangered Javan gibbon (Hylobates moloch) in a submontane tropical rainforest. American Journal of Primatology, 73: 270–280.CrossRefGoogle Scholar
Kim, S., Lappan, S. and Choe, J.C. (2012). Responses of Javan gibbon (Hylobates moloch) groups in submontane forest to monthly variation in food availability: evidence for variation on a fine spatial scale. American Journal of Primatology, 74: 1154–1167.Google Scholar
Lande, R. (1987). Extinction thresholds in demographic models of territorial populations. American Naturalist, 130: 624–635.Google Scholar
Lande, R. (1988). Genetics and demography in biological conservation. Science, 241: 1455–1460.Google Scholar
Lande, R. (1998). Anthropogenic, ecological and genetic factors in extinction and conservation. Population Ecology, 40: 259–269.Google Scholar
Lappan, S. (2007). Social relationships among males in multimale siamang groups. International Journal of Primatology, 28: 369–387.Google Scholar
Lappan, S. (2008). Male care of infants in a siamang (Symphalangus syndactylus) population including socially monogamous and polyandrous groups. Behavioral Ecology and Sociobiology, 62: 1307–1317.Google Scholar
Lappan, S. (2009). Patterns of infant care in wild siamangs (Symphalangus syndactylus) in southern Sumatra. In Lappan, S. and Whittaker, D.J. (eds.), The Gibbons: New Perspectives on Small Ape Socioecology and Population Biology. Springer, New York: 327–345.CrossRefGoogle Scholar
Lappan, S., Andayani, N., Kinnaird, M.F., et al. (2017). Social polyandry among siamang: the role of habitat quality. Animal Behavior, 133: 145–152.CrossRefGoogle Scholar
Lappan, S., Sibarani, M., O’Brien, T.G., et al. (2020). Long-term effects of forest fire on habitat use by siamangs in southern Sumatra. Animal Conservation, 24(3): 355–366.Google Scholar
Lawler, R.R. (2011). Demographic concepts and research pertaining to the study of wild primate populations. Yearbook of Physical Anthropology, 146: 63–85.Google Scholar
Lee, D.C., Powell, V.J. and Lindsell, J.A. (2014). The conservation value of degraded forests for agile gibbons Hylobates agilis. American Journal of Primatology, 77: 76–85.Google Scholar
Liu, H., Ma, H., Cheyne, S.M. and Turvey, S.T. (2020). Recovery hopes for the world’s rarest primate. Science, 368: 1074.Google Scholar
Ma, C.-Y., Brockelman, W.Y., Light, L.E.O., Bartlett, T.Q. and Fan, P.-F. (2019). Infant loss during and after male replacement in gibbons. American Journal of Primatology, 81(8): e23036.Google Scholar
McCallum, H. (2012). Disease and the dynamics of extinction. Philosophical Transactions of the Royal Society B, 367: 2828–2839.Google Scholar
Malone, N. (2007). The socioecology of the critically endangered Javan gibbon (Hylobates moloch): assessing the impact of anthropogenic disturbance on primate social systems. Unpublished PhD thesis, University of Oregon.Google Scholar
Malone, N. and Fuentes, A. (2009). The ecology and evolution of hylobatid communities: causal and contextual factors underlying inter- and intraspecific variation. In Lappan, S. and Whittaker, D.J. (eds.), The Gibbons: New Perspectives on Small Ape Socioecology and Population Biology. Springer, New York: 241–264.Google Scholar
Malone, N., Selby, M. and Longo, S. (2014). Political–ecological dimensions of silvery gibbon conservation efforts. International Journal of Sociology, 44: 34–53.Google Scholar
Marsh, C.W. and Wilson, W.L. (1981). A survey of primates in peninsular Malaysian forests. Final report for the Malaysian Primates Research Programme July 1981. Universiti Kebangsaan Malaysia and University of Cambridge, UK.Google Scholar
Marshall, A.J. (2009). Are montane forests demographic sinks for Bornean white-bearded gibbons (Hylobates albibarbis). Biotropica, 41: 257–267.Google Scholar
Marshall, A.J. (2010). Effects of habitat quality on primate populations in Kalimantan: gibbons and leaf monkeys as case studies. In Gursky-Doyen, S. and Supriatna, J. (eds.), Indonesian Primates. Springer, New York: 157–177.CrossRefGoogle Scholar
Mather, R. (1992). Distribution and abundance of primates in northern Kalimantan Tengah: comparisons with other parts of Borneo and peninsular Malaysia. In Ismail, G., Mohamed, M. and Omar, S. (eds.), Forest Biology and Conservation in Borneo. Yayasan Sabah, Kota Kinabalu: 175–189.Google Scholar
Michaelski, F. and Peres, C.A. (2005). Anthropogenic determinants of primate and carnivore local extinctions in a fragmented forest landscape of southern Amazonia. Biological Conservation, 124: 383–396.Google Scholar
Mitani, J.A. (1990). Demograpy of agile gibbons (Hylobates agilis). International Journal of Primatology, 11: 411–424.Google Scholar
Morino, L. and Borries, C. (2017). Offspring loss after male change in wild siamangs: the importance of abrupt weaning and male care. American Journal of Physical Anthropology, 162: 180–185.CrossRefGoogle ScholarPubMed
Muzaffar, S., Islam, M.A., Feeroz, M.M., et al. (2007). Habitat characteristics of the endangered hoolock gibbons of Bangladesh: the role of plant species richness. Biotropica, 39: 539–545.CrossRefGoogle Scholar
Nijman, V. (2001). Effect of behavioural changes due to habitat disturbance on density estimation in rain forest vertebrates, as illustrated by gibbons (Hylobatidae). In Hillegers, P.J.M. and de Iongh, H.H. (eds.), The Balance between Biodiversity Conservation and Sustainable Use of Tropical Rainforests. Tropenbos, Wageningen: 217–225.Google Scholar
Nijman, V. (2004). Conservation of the Javan gibbon Hylobates moloch: population estimates, local extinctions, and conservation priorities. Raffles Bulletin of Zoology, 52: 271–280.Google Scholar
Nijman, V. (2013). One hundred years of solitude: effects of long-term forest fragmentation on the primate community of Java, Indonesia. In Marsh, L.K. and Chapman, C.A. (eds.), Primates in Fragments: Complexity and Resilience. Springer, New York: 33–45.Google Scholar
Nijman, V. and Menken, S.B.J. (2005). Assessment of census techniques for estimating density and biomass of gibbons (Primates: Hylobatidae). Raffles Bulletin of Zoology, 53: 201–211.Google Scholar
Nongkaew, S., Bumrungsri, S., Brockelman, W.Y., et al. (2018). Population density and habitat of siamang and agile gibbon in Bala forest, southern Thailand. Natural History Bulletin of the Siam Society, 62: 117–130.Google Scholar
O’Brien, T.G. and Kinnaird, M.F. (2011). Demography of agile gibbons (Hylobates agilis) in a lowland tropical rain forest of southern Sumatra, Indonesia: problems in paradise. International Journal of Primatology, 32: 1203–1217. 79Google Scholar
O’Brien, T.G., Kinnaird, M.F., Nurcahyo, A., Prasetyaningrum, M.D.P. and Iqbal, M. (2003). Fire, demography and the persistence of siamang (Symphalangus syndactylus: Hylobatidae) in a Sumatran rainforest. Animal Conservation, 6: 115–121.Google Scholar
O’Brien, T.G., Kinnaird, M.F., Nurcahyo, A., Iqbal, M. and Rusmanto, M. (2004). Abundance and distribution of sympatric gibbons in a threatened Sumatrain rain forest. International Journal of Primatology, 25: 267–284.Google Scholar
Oktaviani, R., Kim, S., Cahyana, A.N. and Choe, J.C. (2018). Nutrient composition of the diets of Javan gibbons (Hylobates moloch). IOP Conference Series: Earth and Environmental Science, 197: 012048.Google Scholar
Palombit, R.A. (1992). Pair bonds and monogamy in wild siamang (Hylobates syndactylus) and white-handed gibbon (Hylobates lar) in northern Sumatra. PhD thesis, University of California Davis.Google Scholar
Palombit, R.A. (1994). Dynamic pair bonds in hylobatids: implications regarding monogamous social systems. Behaviour, 128: 65–101.CrossRefGoogle Scholar
Palombit, R.A. (1995). Longitudinal patterns of reproduction in wild female siamang (Hylobates syndactylus) and white-handed gibbons (Hylobates lar). International Journal of Primatology, 16: 739–768.Google Scholar
Pang, Y. H. (2020). Population densities of agile gibbon (Hylobates agilis) and their relationship with habitat characteristics and history of disturbance in the Ulu Muda Forest Reserve, Malaysia. MSc thesis, Universiti Sains Malaysia.Google Scholar
Phoonjampa, R., Koenig, A., Brockelman, W.Y., et al. (2011). Pileated gibbon density in relation to habitat characteristics and post-logging forest recovery. Biotropica, 43: 619–627.Google Scholar
Pries, A.J., Branch, L.C. and Miller, D.L. (2009). Impact of hurricanes on habitat occupancy and spatial distribution of beach mice. Journal of Mammalogy, 90: 841–850.Google Scholar
Rao, J. S. (1976). Some tests based on arc-lengths for the circle. Sankhya: The Indian Journal of Statistics, Series B, 38: 329–338.Google Scholar
Reichard, U.H. and Barelli, C. (2008). Life history and reproductive strategies of Khao Yai Hylobates lar: implications for social evolution in apes. International Journal of Primatology, 29: 823–844.Google Scholar
Reichard, U.H., Ganpanakngan, M. and Barelli, C. (2012). White-handed gibbons of Khao Yai: social flexibility, complex reproductive strategies, and a slow life history. In Kappeler, P.M. and Watts, D.P. (eds.), Long-Term Field Studies of Primates. Springer, New York: 237–258.Google Scholar
Savini, T., Boesch, C. and Reichard, U. (2008). Home-range characteristics and the influence of seasonality on female reproduction in white-handed gibbons (Hylobates lar) at Khao Yai National Park, Thailand. American Journal of Physical Anthropology, 135: 1–12.Google Scholar
Savini, T., Boesch, C. and Reichard, U. (2009). Varying ecological quality influences the probability of polyandry in white-handed gibbons (Hylobates lar) in Thailand. Biotropica, 41: 503–513.Google Scholar
Setiawan, A., Nugroho, T.S., Wibisono, Y., Ikawati, V. and Sugardjito, J. (2012). Population density and distribution of Javan gibbon (Hylobates moloch) in Central Java, Indonesia. Biodiversitas, 13: 23–27.Google Scholar
Slobodkin, L. B. (1961). Growth and Regulation of Animal Populations. Holt, Rinehart and Winston, New York.Google Scholar
Smith, J.H., King, T., Campbell, C., Cheyne, S.M. and Nijman, V. (2017). Modelling population viability of three independent Javan gibbon (Hylobates moloch) populations on Java, Indonesia. Folia Primatologica, 88: 507–522.Google Scholar
Smith, R.J. and Jungers, W.L. (1997). Body mass in comparative primatology. Journal of Human Evolution, 32: 523–559.Google Scholar
Sodhi, N.S., Koh, L.P., Brook, B.W. and Ng, P.K.L. (2004). Southeast Asian biodiversity: an impending disaster. Trends in Ecology and Evolution, 19: 654–660.Google Scholar
Srikosamatara, S. and Brockelman, W.Y. (1987). Polygyny in a group of pileated gibbons via a familial route. International Journal of Primatology, 8: 389–393.Google Scholar
Strier, K.B. (2014). Northern muriqui monkeys: behavior, demography, and conservation. In Yamagiwa, J. and Karczmarski, L. (eds.), Primates and Cetaceans. Springer, Tokyo: 233–247.Google Scholar
Suwanvecho, U. and Brockelman, W.Y. (2012). Interspecific territoriality in gibbons (Hylobates lar and H. pileatus) and its effect on the dynamics of interspecies contact zones. Primates, 53: 97–108.Google Scholar
Tenaza, R.R. (1975). Territory and monogamy among Kloss’ gibbons (Hylobates klossii) in Siberut Island, Indonesia. Folia Primatologica, 24: 60–80.Google Scholar
Terleph, T.A., Malaivijitnond, S. and Reichard, U.H. (2016). Age related decline in female lar gibbon great call performance suggests that call features correlate with physical condition. BMC Evolutionary Biology, 16: 4.Google Scholar
Tilson, R.L. (1981). Family formation strategies of Kloss’s gibbons. Folia Primatologica, 35: 259–287.Google Scholar
Whittaker, D.J. (2005). New population estimates for the endemic Kloss’s gibbon Hylobates klossii on the Mentawai Islands, Indonesia. Oryx, 39: 458–461.Google Scholar
Wich, S.A., Utami-Atmoko, S.S., Mitra Setia, T., et al. (2004). Life history of wild Sumatran orangutans (Pongo abelii). Journal of Human Evolution, 47: 385–398.Google Scholar
Yanuar, A. (2009). The population distribution and abundance of siamangs (Symphalangus syndactylus) and agile gibbons (Hylobates agilis) in west central Sumatra, Indonesia. In Lappan, S. and Whittaker, D.J. (eds.), The Gibbons: New Perspectives on Small Ape Socioecology and Population Biology. Springer, New York: 453–465.Google Scholar
Yi, Y., Kim, Y., Hikmat, A. and Choe, J.C. (2020a). Information transfer through food from parents to offspring in wild Javan gibbons. Scientific Reports, 10: 714.CrossRefGoogle ScholarPubMed
Yi, Y., Fichtel, C., Ham, S., Jang, H. and Choe, J.C. (2020b). Fighting for what it’s worth: participation and outcome of inter-group encounters in a pair-living primate, the Javan gibbon (Hylobates moloch). Behavioral Ecology and Sociobiology, 74(8): 96.Google Scholar
Yi, Y., Kim, E., Fichtel, C. and Choe, J.C. (2020c). Impacts of inter-group interactions on intra-group behavioral changes in Javan gibbons. International Journal of Primatology, 41: 382–400.Google Scholar
Zhou, J., Wei, F., Li, M., Lok, C.B.P. and Wang, D. (2008). Reproductive characters and mating behaviour of wild Nomascus hainanus. International Journal of Primatology, 29: 1037–1046.Google Scholar
Zulfah, S. (2011). Estimasi kepadatan dan penyebaran Owa Jawa (Hylobates moloch Audebert, 1798 di Bodogol Taman Nasional Gede Pangrango, Jawa Barat. In Ario, A., Supriatna, J. and Andayani, N. (eds.), Owa Jawa di Taman Nasional Gunung Gede Pangrango. Conservation International, Jakarta, Indonesia: 108–114.Google Scholar

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