The Conservation Status of Gibbons in Vietnam - Gibbon Research ...

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Nomascus leucogenysDuong Anh Tuan 2003). Although gibbons were not especially targeted by hunters, some huntersfrom Ngo Luong believed that drinking gibbon urine would improve their sexual vitality (CanoAlonso & Pham Quang Thien 2010).Threats and Conservation ActionsIn recognition of their likely extirpation and non-viability, gibbons have not been included as afocal species in the conservation plan for the nature reserve (Le Duc Minh & Cano Alonso 2010).No conservation actions are advocated at the current time.5.4.3 Pu Luong Nature ReserveLocation: Quan Hoa and Ba Thuoc Districts, Thanh Hoa ProvinceArea: 17,662 hectaresStatus criteria: 1c, 2b, 3b, 4b, 5eDate of most recent survey: 2008Date of most recent confirmed record: N/AMinimum population: extirpatedStatusGeissmann et al. (2000) noted it was unlikely that a significant population of N. leucogenysremained in this reserve, based on interview surveys in 1998 which suggested the species hadbeen extirpated for over a decade. Primate surveys since 2000, mainly for Delacour’s langurTrachypithecus delacouri, have failed to record N. leucogenys (Nadler et al. 2004; Luong Van Hao &Le Van Hai 2008). Interviews of residents by Le Trong Dat found that gibbons had not been heardfor 10-18 years (Nadler et al. 2004). On the basis of this data, Nadler et al. (2004) considered thespecies to be extirpated.Threats and Conservation ActionsThe species is not mentioned in the reserve’s management plan or conservation needsassessment (Anon. 2004a, b) and no conservation actions are advocated at the current time.Reintroduction is not feasible due to continued hunting pressure.5.4.4 Khe Net Proposed Nature ReserveLocation: Tuyen Hoa District, Quang Binh ProvinceArea: 23,534 hectaresStatus criteria: 1a, 2b, 3b, 4b, 5dDate of most recent survey: 2010Date of most recent confirmed record: 2005Minimum population: provisionally extirpatedStatusIt is unclear whether the gibbons in this reserve would be N. siki or N. leucogenys (Van Ngoc Thinhet al. 2010e), with vocal analysis from neighbouring Ke Go Nature Reserve suggesting the former(Van Ngoc Thinh et al. 2010a) and assumed taxonomic boundaries suggesting the latter (VanNgoc Thinh et al. 2010e). Surveys in 2010 did not detect any gibbons despite considerable surveyeffort across areas where gibbons were recorded in previous surveys (Van Ngoc Thinh et al.52
The Conservation Status of Gibbons in Vietnam2010a). In 2004, two groups were recorded during surveys and local interviews and this wassurmised to comprise the total population (Nguyen Manh Ha 2005). In 2001, local residents alsoreported that only two groups were present, although none were seen during surveys (Le TrongTrai et al. 2001a). Gibbons may now be extirpated from this reserve.Threats and Conservation ActionsSurveys over the past decade have documented uncontrolled wildlife hunting in the reserve. Thesite was intensively logged in the 1990s while designated as a state forest enterprise (NguyenManh Ha 2005) and illegal logging is ongoing (Van Ngoc Thinh et al. 2010a). Large areas of forestare now degraded and the area of suitable gibbon habitat has been reduced (Nguyen Manh Ha2005). Should gibbons be rediscovered in the reserve, options for conservation are limited due tothese factors. This nature reserve is contiguous with Ke Go Nature Reserve (see above) where afew scattered groups remain and the population is probably no longer viable.5.5 Sites with No New Data Since 2000Sites which had confirmed or provisional records for N. leucogenys between 1995 and 2000 aslisted in Geissmann et al. (2000) and for which there have been no gibbon records since that timeare listed in Table 5 below.Table 5. Sites with no new data for N. leucogenys.SiteThanh Hoa ProvinceThach TuongCommuneMost recent recordLast record by interview in 199953
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The Conservation Status of Gibbons
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The Conservation Status of Gibbons
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A site is defined in this report as
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Abbreviations and Acronymsa.s.l. ab
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carried out in 2000 and 2001. At Ho
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ConclusionsWhile gibbons are afford
Page 18 and 19: IntroductionChapter 1IntroductionFe
Page 20 and 21: Introductionexperienced conservatio
Page 22 and 23: The Conservation Status of Gibbons
Page 36 and 37: Nomascus nasutusChapter 3Eastern bl
Page 38 and 39: Nomascus nasutus3 Eastern Black Gib
Page 40 and 41: Nomascus nasutusrecorded on an ad h
Page 42 and 43: Nomascus nasutusand field surveys,
Page 44 and 45: Nomascus concolorChapter 4Western b
Page 46 and 47: Nomascus concolor4 Western Black Gi
Page 48 and 49: Nomascus concolorwill provide incre
Page 50 and 51: Nomascus concolorthose in neighbour
Page 52 and 53: Nomascus concolorDat & Le Minh Phon
Page 54 and 55: Nomascus leucogenysChapter 5Norther
Page 56 and 57: Nomascus leucogenys5 Northern White
Page 58 and 59: Nomascus leucogenys5.3 Nomascus leu
Page 60 and 61: Nomascus leucogenysNguyen Manh Ha e
Page 62 and 63: Nomascus leucogenysThe reserve mana
Page 64 and 65: Nomascus leucogenys5.3.10 Pu Mat Na
Page 66 and 67: Nomascus leucogenysStatusA 13 day s
Page 70 and 71: Nomascus sikiChapter 6Southern whit
Page 72 and 73: Nomascus siki6 Southern White-cheek
Page 74 and 75: Nomascus siki6.2.5 Priority Conserv
Page 76 and 77: Nomascus sikithese vagaries, the pa
Page 78 and 79: Nomascus sikifield records (Le Manh
Page 80 and 81: Nomascus annamensisChapter 7Norther
Page 82 and 83: Nomascus annamensis7 Northern Yello
Page 84 and 85: Nomascus annamensisStatusThis site
Page 86 and 87: Nomascus annamensisThreats and Cons
Page 88 and 89: Nomascus annamensisDate of most rec
Page 92 and 93: Nomascus annamensisgroups) and 148
Page 96 and 97: Nomascus gabriellaeChapter 8Souther
Page 98 and 99: Nomascus gabriellae8 Southern Yello
Page 100 and 101: Nomascus gabriellae8.2.4 Ongoing Co
Page 102 and 103: Nomascus gabriellae8.3.4 Chu Yang S
Page 104 and 105: Nomascus gabriellaeThreats and Cons
Page 106 and 107: Nomascus gabriellaeDate of most rec
Page 108 and 109: Nomascus gabriellaepark-wide census
Page 110 and 111: Nomascus gabriellaeStatusThis reser
Page 112 and 113: Classification & Distribution of Cr
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Classification & Distribution of Cr
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Ecology & Behaviour of Crested Gibb
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References11 ReferencesAbramov, A.
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ReferencesDang Ngoc Can, Pham Duc T
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ReferencesGeissmann, T., Nguyen Man
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ReferencesLa Quang Trung, and Trinh
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ReferencesLuong Van Hao, and Le Van
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ReferencesNguyen Quang Hoa Anh, Tha
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ReferencesSrikosamatara, S., and S.
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AnnexesAnnex 1. Summary of Gibbon R
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AnnexesSiteProvinceArea(ha)Minimum
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Annexesd) number of locations or su
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Annexesc) area, extent or quality o
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