Gibbon Research Lab.

2016

Bryant, J. V., Gottelli, D., Zeng, X., Hong, X., Chan, B. P. L., Fellowes, J. R., Zhang, Y., Luo, J., Durrant, C., Geissmann, T., Chatterjee H. J., and Turvey S. T. (2016). Assessing current genetic status of the Hainan gibbon using historical and demographic baselines: implications for conservation management of species of extreme rarity. Molecular Ecology 25: 3540-3556. [PDF] Geissmann, T. (2016). Gibbons, die singenden Menschenaffen. Welt der Tiere 2016 (2): 50-51. [PDF]

2011

Browne, S., Momberg, F., and Geissmann, T. (2011). Hoolock gibbon status and conservation: Editorial. Gibbon Journal 6: 5-6. [PDF] Ngwe Lwin, Geissmann, T., Saw Soe Aung, Thet Naing Aung, Zin Myo Aung, Tony Htin Hla, Grindley, M., and Momberg, F. (2011). The Myanmar Hoolock Gibbon Conservation Status Review: First results. Gibbon Journal 6: 18-21. [Abstract] [PDF]  Rawson, B.M., Insua-Cao, P., Nguyen Manh Ha, Van Ngoc Thinh, Hoang Minh Duc, Mahood, S., Geissmann, T., and Roos, C. (2011). The conservation status of gibbons in Vietnam. Fauna & Flora International and Conservation International, Hanoi, Vietnam, xiv+138 pp. [Summary] [PDF] Sun, G.-Z., Huang, B., Guan, Z.-H., Geissmann, T., and Jiang, X.-L. (2011). Individuality in male songs of wild black crested gibbons (Nomascus concolor). American Journal of Primatology 73: 431-438. [Abstract] [PDF]

2010

Van Ngoc Thinh, Mootnick, A. R., Geissmann, T., Ming Li, Ziegler, T., Agil, M., Moisson, P., Nadler, T., Walter, L., and Roos, C. (2010). Mitochondrial evidence for multiple radiations in the evolutionary history of small apes. BMC Evolutionary Biology 10: 74 (http://www.biomedcentral.com/1471-2148/1410/1474). [Abstract] [PDF] von Allmen, A., and Geissmann, T. (2010). Soziale Kommunikation bei Schopfgibbons (Gattung Nomascus) in zoologischen Gärten. In Bürgin, T., and Straub, J. O. (eds.) Festschrift zum 70. Geburtstag von Prof. Dr. David Gaudenz Senn, T. Bürgin and J. O. Straub, St. Gallen and Allschwil, pp. 7-16 (German text). [PDF]

2009

Walker, S., Molur, S., Brockelman, W. Y., Das, J., Islam, A., Geissmann, T., and Fan Peng-Fei, (2009). Western hoolock gibbon Hoolock hoolock (Harlan, 1831). In Mittermeier, R. A., Wallis, J., Rylands, A. B., Ganzhorn, J. U., Oates, J. F., Williamson, E. A., Palacios, E., Heymann, E. W., Kierulff, M. C. M., Long Yongcheng, Supriatna, J., Roos, C., Walker, S., Cortés-Ortiz, L., and Schwitzer, C. (eds.) Primates in peril: The world’s 25 most endangered primates 2008—2010. IUCN/SSC Primate Specialist Group (PSG), International Primatological Society (IPS), and Conservation International (CI), Arlington, VA, pp. 62-64. [PDF] Geissmann, T., Vu Ngoc Thanh, Dine, M. C., and Tu Minh Tiep (2009). Results of a gibbon survey in the Kim Hy Nature Reserve (Bac Kan province) in northeastern Vietnam. People Resources Conservation Foundation (PRCF), Vietnam Programme, Hanoi, 25 pp. [Abstract] [PDF] Geissmann, T., and Nguyen The Cuong (2009). Results of a rapid gibbon survey in the Lung Ri area (Trung Khanh district, Cao Bang province) in northeastern Vietnam. Fauna and Flora International (FFI), Vietnam Programme, Hanoi, 9 pp. [Abstract] [PDF] Dallmann, R., and Geissmann, T. (2009). Individual and geographical variability in the songs of wild silvery gibbons (Hylobates moloch) on Java, Indonesia. In Lappan, S. M., and Whittacker, D. (eds.) The gibbons: New perspectives on small ape socioecology and population biology, Springer, New York, pp. 91-110. [Abstract] [PDF] Keith, S. A., Waller, M. S., and Geissmann, T. (2009). Vocal diversity of Kloss’s gibbons (Hylobates klossii) in the Mentawai Islands, Indonesia. In Lappan, S. M., and Whittacker, D. (eds.) The gibbons: New perspectives on small ape socioecology and population biology, Springer, New York, pp. 51-71. [Abstract] [PDF] Grueter, C. C., Jiang Xuelong, Konrad, R., Fan Pengfei, Guan Zhenhua, and Geissmann, T. (2009). Are Hylobates lar extirpated from China? International Journal of Primatology 30: 553-567. [Abstract] [PDF] Geissmann, T. (2009). Door slamming: Tool-use by a captive white-handed gibbon (Hylobates lar). Gibbon Journal 5: 53-60. [Abstract] [PDF] Geissmann, T., and Anzenberger, G. (2009). Hormonal correlates of the ovarian cycle in the yellow-cheeked crested gibbon (Nomascus gabriellae), and a review of ovarian cycles in gibbons (Hylobatidae). Gibbon Journal 5: 61-73. [Abstract] [PDF] Geissmann, T., Geschke, K., and Blanchard, B. J. (2009). Longevity in gibbons (Hylobatidae). Gibbon Journal 5: 81-92. [Abstract] [PDF] Geissmann, T., Grindley, M., Momberg, F., Ngwe Lwin, and Saw Moses (2009). Hoolock gibbon and biodiversity survey and training in southern Rakhine Yoma, Myanmar. Gibbon Journal 5: 7-27. [Abstract] [PDF] Geissmann, T. (2009). Chinas letzte Weisswangen-Schopfgibbons: Ein Projektbericht aus dem Süden der Provinz Yunnan. Gibbon Conservation Alliance, Jahresbericht 5(May): 15 (German text, English abstract). [Abstract] [PDF]

2008

Geissmann, T., Grindley, M., Momberg, F., Ngwe Lwin, and Saw Moses (2008). Hoolock gibbon and biodiversity survey and training in southern Rakhine Yoma, Myanmar: Preliminary report, Myanmar Primate Conservation Program, BANCA, FFI, PRCF and Yangon University, Yangon, Myanmar. 31 pp. [Abstract] [PDF] Geissmann, T. (2008). Gibbon paintings in China, Japan, and Korea: Historical distribution, production rate and context. Gibbon Journal 4: 1-38. [Abstract] [PDF] Geissmann, T. (2008). Inter-group conflict in captive siamangs (Symphalangus syndactylus). Gibbon Journal 4: 51-55. [Abstract] [PDF] Geissmann, T. (2008). Auf der Suche nach Chinas letzten Weisshandgibbons: Ein Projektbericht aus dem Nangunhe-Naturreservat in der Provinz Yunnan [In search of the China's last white-handed gibbons: A project report from the Nangunhe Nature Reserve in Yunnan Province]. Gibbon Conservation Alliance, Jahresbericht 4(May): 10-21 (German text, English summary). [Abstract] [PDF] Geissmann, T., and Manella, B. (2008). Steroid secretion in siamang (Symphalangus syndactylus) skin glands. Gibbon Journal 4: 56-63. [Abstract] [PDF]

2007

Geissmann, T. (2007). Status reassessment of the gibbons: Results of the Asian Primate Red List Workshop 2006. Gibbon Journal 3: 5-15. [Abstract] [PDF] Geissmann, T. (2007). First field data on the Laotian black crested gibbon (Nomascus concolor lu) of the Nam Kan area of Laos. Gibbon Journal 3: 56-65. [Abstract] [PDF] Geissmann, T., Trinh Dinh Hoang, La Quang Trung, and Tallents, L. (2007). A brief survey for crested gibbons in Bach Ma National Park, central Vietnam. Gibbon Journal 3: 43-49. [Abstract] [PDF] Konrad, R., and Geissmann, T. (2007). Menschenrechte für Gibbons? Versuche mit Menschenaffen [Human rights for gibbons? Experiments with apes]. Gibbon Journal 3: 16-22 (German text, English summary). [Abstract] [PDF]

2006

Konrad, R., and Geissmann, T. (2006). Vocal diversity and taxonomy of Nomascus in Cambodia. International Journal of Primatology 27: 713-745. [Abstract] [PDF] Geissmann, T. (2006). Forschungsbesprechung: Hulocks erhalten einen neuen Gattungsnamen [Research Review: Hoolocks get a new genus name]. Gibbon Journal 2: 37-39 (German text, English summary). [Abstract] [PDF] Geissmann, T. (2006). Schutz des Hainan-Schopfgibbons, des seltensten Menschenaffen der Welt: Ein Projektbericht [Conservation of the Hainan black crested gibbon, the most endangered ape species: A project report]. Gibbon Journal 2: 11-13 (German text, English summary). [Abstract] [PDF] Geissmann, T., Nijman, V., and Dallmann, R. (2006). The fate of diurnal primates in southern Sumatra. Gibbon Journal 2: 18-24. [Abstract] [PDF] Geissmann, T., Traber, S., and von Allmen, A. (2006). Das Nangunhe-Naturreservat, Provinz Yunnan, China: Ein Projektbericht [Nangunhe Nature Reserve, Yunnan Province, China: A project report]. Gibbon Journal 2: 14-17 (German text, English summary). [Abstract] [PDF] Geissmann, T., and Nijman, V. (2006). Calling in wild silvery gibbons (Hylobates moloch) in Java (Indonesia): Behavior, phylogeny, and conservation. American Journal of Primatology 68: 1-19. [Abstract] [PDF]

2005

Chan, B.P.L., Fellowes, J.R., Geissmann, T. and Zhang, J. (eds.) (2005). Status Survey and Conservation Action Plan for the Hainan Gibbon -Version I (Last Updated November 2005). Kadoorie Farm & Botanic Garden Technical Report No. 3. KFBG, Hong Kong SAR, iii + 33 pp. [Abstract] [PDF] Geissmann, T.; Bohlen-Eyring, S., and Heuck, A. (2005). The male song of the Javan silvery gibbon (Hylobates moloch). Contributions to Zoology 74: 1-25. [Abstract] [PDF] Takacs, T.; Morales, J.C.; Geissmann, T., and Melnick, D.J. (2005). A complete species-level phylogeny of the Hylobatidae based on mitochondrial ND3-ND4 gene sequences. Molecular Phylogenetics and Evolution 36: 456-467. [Abstract] [PDF] Geissmann, T. (2005). Auf der Suche nach den letzten Gibbons von Hainan. Gibbon Journal 1: 18-22 (German text, English abstract). [Abstract] [PDF] Geissmann, T. (2005). Der Hainan-Schopfgibbon: Der bedrohteste Menschenaffe der Welt. Gibbon Journal 1: 10-12 (German text, English abstract). [Abstract] [PDF]

2004

Brandon-Jones, D.; Eudey, A.A.; Geissmann, T.; Groves, C.P.; Melnick, D.J.; Morales, J.C.; Shekelle, M., and Stewart, C.-B. (2004). Asian primate classification. International Journal of Primatology 25: 97-164. [Abstract] [PDF] Chen, H.-C.; Geissmann, T., and Chen, P.-C. (2004). A survey of the taxonomic status of captive gibbons in Taiwan. The Raffles Bulletin of Zoology 52: 265-269. [Abstract] [PDF] Geissmann, T. (2004). Rettet die bedrohtesten Menschenaffen. Gibbon Conservation Alliance, Zürich. 2 pp. (German text). [PDF]

2003

Geissmann, T. (2003). Circumfacial markings in siamang and evolution of the face ring in the Hylobatidae. International Journal of Primatology 24: 143-158. [Abstract] [PDF] Geissmann, T. (2003). Vergleichende Primatologie. Springer Verlag, Heidelberg & New York, XII+357 pp., ISBN 3-540-43645-6 (German Text). This book contains an extensive chapter on gibbons. [Summary] Geissmann, T. (compiler) (2003). Symposium on gibbon diversity and conservation: Concluding resolution. Asian Primates 8(3-4): 28-29. [Full text] [PDF] Geissmann, T.; La Quang Trung; Trinh Dinh Hoang; Vu Dinh Thong; Dang Ngoc Can, and Pham Duc Tien (2003). Rarest ape species rediscovered in Vietnam. Asian Primates 8(3-4): 8-9. [Full text] [PDF] Geissmann, T., Nguyen Xuan Dang; Lormée, N., and Momberg, F. (2003). Status review of gibbons in Vietnam. Asian Primates 8(3-4): 10-12. [Full text] [PDF] Geissmann, T., Nguyen Xuan Dang; Lormée, N., and Momberg, F. (2003). Vietnam primate conservation status review 2000, Part 1: Gibbons (Summary). Asian Primates 8(3-4): 42.

Baker, L.R., Geissmann, T., Nadler, T., Long, B., and Walston, J. (2002). Cambodia: Primate field guide. Phnom Penh, Cambodia: Fauna & Flora Cambodia. 8 pp. (English and Khmer text). [PDF] Geissmann, T. (2002). Duet-splitting and the evolution of gibbon songs. Biological Reviews 77: 57-76. [Abstract] [PDF] Geissmann, T. (2002). Taxonomy and evolution of gibbons. In: Soligo, C., Anzenberger, G., and Martin, R.D. (eds.), Anthropology and primatology into the third millennium: The Centenary Congress of the Zürich Anthropological Institute (Evolutionary Anthropology Vol. 11, Supplement 1), Wiley-Liss, New York, pp. 28-31. [Abstract] [Full text] [PDF] Geissmann, T., and Dallmann, R. (2002). Die Gesänge der Gibbons und die Evolution der Musik. Praxis der Naturwissenschaften 51(1): 21-29 (German text). [Abstract] [PDF] Geissmann, T., La Quang Trung, Trinh Dinh Hoang, Dang Ngoc Can, Pham Duc Tien, and Vu Dinh Thong (2002). Report on an overall survey of the Cao Vit gibbon population (Nomascus sp. cf. nasutus) in Trung Khanh District, Cao Bang Province (second overall survey). Fauna & Flora International, Asia Pacific Programme, Hanoi, 8 pp. [Full text] [PDF]

2001

Dallmann R., and Geissmann, T. (2001). Different levels of variability in the female song of wild silvery gibbons (Hylobates moloch). Behaviour 138: 629-648. [Abstract] [PDF] Dallmann, R., and Geissmann, T. (2001). Individuality in the female songs of wild silvery gibbons (Hylobates moloch) on Java, Indonesia. Contributions to Zoology 70: 41-50. [Abstract] [PDF] Also available from http://dpc.uba.uva.nl/ctz/vol70/ Geissmann, T. (2001). TiHo-Forscher warnt: Heimliches Aussterben der Kleinen Menschenaffen in Indochina. TiHo-Anzeiger (Tierärztliche Hochschule Hannover) 30(6): 8 (German text). [Full text] [PDF] Geissmann, T., and Vu Ngoc Thanh (2001). Preliminary results of a primate survey in northeastern Vietnam, with special reference to gibbons. Asian Primates 7(3-4): 0-4. [Full text] [PDF] Roos, C., and Geissmann, T. (2001). Molecular phylogeny of the major hylobatid divisions. Molecular Phylogenetics and Evolution 19: 486-494. [Abstract] [PDF] Tallents, L.; Geissmann, T., Trinh Dinh Hoang, and La Quang Trung (2001). Survey for crested gibbons (genus Nomascus) in Bach Ma National Park, Viet Nam, April 2001. Fauna & Flora International, Indochina Programme, Hanoi, Vietnam, 5 pp. [Full text] [PDF]

2000

Baker, L.R., Nadler, T., and Geissmann, T. (2000). Viet Nam: Primate field guide. Fauna & Flora International, Indochina Programme, Hanoi. 8 pp. (English and Vietnamese text). [Summary] [PDF] Geissmann, T. (2000). Duet songs of the siamang, Hylobates syndactylus: I. Structure and organisation. Primate Report 56: 33-60. [Abstract] [Full text] [PDF] Geissmann, T. (2000). Gibbon songs and human music from an evolutionary perspective. In: The origins of music. Wallin, N.; Merker, B., and Brown, S. (eds.), pp.103-123, Cambridge, Massachusetts: MIT Press. [Abstract] [Full text] [PDF] Geissmann, T., Nguyen Xuan Dang, Lormée, N., and Momberg, F. (2000). Vietnam primate conservation status review 2000 - Part 1: Gibbons. Fauna & Flora International, Indochina Programme, Hanoi. 130 pp. ISBN: 1-903703-03-4. English edition. [Summary] [PDF] Geissmann, T., Nguyen Xuan Dang, Lormée, N., and Momberg, F. (2000). [Vietnam primate conservation status review 2000 - Part 1: Gibbons.] Fauna & Flora International, Indochina Programme, Hanoi. 142 pp. Vietnamese edition. [Summary] [PDF] Geissmann, T., and Orgeldinger, M. (2000). The relationship between duet songs and pair bonds in siamangs, Hylobates syndactylus. Animal Behaviour 60: 805-809. [Abstract] [PDF] Ujhelyi, M., Merker, B., Buk, P., and Geissmann, T. (2000). Observations on the behavior of gibbons (Hylobates leucogenys, H. gabriellae, and H. lar) in the presence of mirrors. Journal of Comparative Psychology 114: 253-262. [Abstract] [PDF]

1999

Geissmann, T. (1999). Duet songs of the siamang, Hylobates syndactylus: II. Testing the pair-bonding hypothesis during a partner exchange. Behaviour 136: 1005-1039. [Abstract] [PDF]

1997

Braendle, C., and Geissmann, T. (1997). Behavioural development of a pileated gibbon. International Zoo News 44: 4-16. [Abstract] [PDF] Geissmann, T., and Braendle, C. (1997). Helping behaviour in captive pileated gibbons (Hylobates pileatus). Folia Primatologica  68: 110-112. [Abstract] [PDF] Geissmann, T. (1997). New sounds from the crested gibbons (Hylobates concolor group): First results of a systematic revision. In: Verhandlungen der Deutschen Zoologischen Gesellschaft: Kurzpublikationen - Short Communications, 90. Jahresversammlung 1997 in Mainz, p. 170. Zissler, D. (ed.), Gustav Fischer, Stuttgart. [Full text] [PDF]

1996

Geissmann, T. (1996). Einsichten in der Affensystematik. UniZürich (Magazin der Universität Zürich) 1996 (2): 71 (German text). [Abstract] [Full text] [PDF]

1995

Geissmann, T., and Orgeldinger, M. (1995). Neonatal weight in gibbons (Hylobates spp.). American Journal of Primatology 36: 179-189. [Abstract] [PDF] Geissmann, T. (1995). Gibbon systematics and species identification. International Zoo News 42: 467-501. [Abstract] [PDF low resolution] [PDF high resolution] Geissmann, T. (1995). Captive management and conservation of gibbons in China and Vietnam, with special reference to crested gibbons (Hylobates concolor group). Primate Report 42: 29-41. [Abstract] [PDF] Geissmann, T. (1995). The yellow-cheeked gibbons (Hylobates gabriellae) in Nam Bai Cat Tien (southern Vietnam) revisited. Primates 36: 447-455. [Abstract] [PDF]

1994

Dal Pra, G., and Geissmann, T. (1994). Behavioural development of twin siamangs (Hylobates syndactylus). Primates 35: 325-342. [Abstract] [PDF] Geissmann, T., and Lim, K.K.P. (1994). Extraction of bacula from tanned gibbon skins. Raffles Bulletin of Zoology 42: 775-780. [Abstract] [PDF] Geissmann, T., and Hulftegger, A. M. (1994). Olfactory communication in gibbons? In: Roeder, J.J., Thierry, B., Anderson, J.R., and Herrenschmidt, N. (eds.), Current primatology, vol. 2: Social development, learning and behaviour (pp. 199-206). Strasbourg: Université Louis Pasteur. [Abstract] [PDF] Geissmann, T. (1994). Systematik der Gibbons. Zeitschrift des Kölner Zoo 37: 65-77 (German text, English abstract). [Abstract] [PDF]

1993

Geissmann, T. (1993). Hypertrichosis in a gibbon (Hylobates muelleri). Journal of Medical Primatology 22: 317-319. [Abstract] [PDF]

1991

Dielentheis, T.F., Zaiss, E., and Geissmann, T. (1991). Infant care in a family of siamangs (Hylobates syndactylus) with twin offspring at Berlin Zoo. Zoo Biology 10: 309-317. [Abstract] [PDF] Geissmann, T. (1991). Sympatry between white-handed gibbons (Hylobates lar) and pileated gibbons (H. pileatus) in southeastern Thailand. Primates 32: 357-363. [Abstract] [PDF] Geissmann, T. (1991). The Spaeth gibbon collection. Natural History Bulletin of the Siam Society 39: 53-70. [Abstract] [PDF] Geissmann, T. (1991). A reassessment of age of sexual maturity in gibbons (Hylobates spp.). American Journal of Primatology 23: 11-22. [Abstract] [PDF]

1990

Hellekant, G., DuBois, G., Geissmann, T., Glaser, D., and van der Wel, H. (1990). Taste responses of chorda tympani proper nerve in the white-handed gibbon (Hylobates lar). In: ISOT X. Proceedings of the Tenth International Symposium on Olfaction and Taste, Oslo, Norway, July 16-20, 1989, pp. 115-131. Døving, K.B. (ed.), GCS (Graphic Communication System), Oslo. [Abstract] [PDF] Fischer, J.O., and Geissmann, T. (1990). Group harmony in gibbons: Comparison between white-handed gibbon (Hylobates lar) and siamang (H. syndactylus). Primates 31: 481-494. [Abstract] [PDF]

1989

Geissmann, T. (1989). Multiple births in catarrhine monkeys and apes - A review. 78 pp. Il Sedicesimo, Firenze, Italy, 78 pp. [Abstract] [PDF] Geissmann, T. (1989). A female black gibbon, Hylobates concolor subspecies, from northeastern Vietnam. International Journal of Primatology 10: 455-476. [Abstract] [PDF]

1987

Geissmann, T. (1987). A sternal gland in the siamang gibbon (Hylobates syndactylus). International Journal of Primatology 8: 1-15. [Abstract] [PDF]

1986

Geissmann, T. (1986). Mate change enhances duetting activity in the siamang gibbon (Hylobates syndactylus). Behaviour 96: 17-27. [Abstract] [PDF]

1984

Geissmann, T. (1984). Inheritance of song parameters in the gibbon song, analysed in 2 hybrid gibbons (Hylobates pileatus x H. lar). Folia Primatologica 42: 216-235. [Abstract] [PDF]

1983

Geissmann, T. (1983). Female capped gibbon (Hylobates pileatus Gray 1891) sings male song. Journal of Human Evolution 12: 667-671. [Abstract] [PDF]

Site by Thomas Geissmann.
For comments & suggestions, please email to
webmaster@gibbons.de

Gibbon Research Lab. Home: