Book contents
- Gibbon Conservation in the Anthropocene
- Gibbon Conservation in the Anthropocene
- Copyright page
- Contents
- Contributors
- Foreword
- Abbreviations
- Introduction
- 1 Taxonomy, Ecology and Conservation of Cao Vit Gibbon (Nomascus nasutus) since Its Rediscovery
- 2 Conservation Status of the Northern Yellow-Cheeked Crested Gibbon (Nomascus annamensis) in Vietnam
- 3 Strategies for Recovery of the Hainan Gibbon (Nomascus hainanus)
- 4 Gibbons in the Anthropocene
- 5 Demography of a Stable Gibbon Population in High-Elevation Forest on Java
- 6 A Tale of Two Gibbon Studies in Thailand
- 7 Accessibility as a Factor for Selecting Conservation Actions for Pileated Gibbons (Hylobates pileatus)
- 8 Calling from the Wild
- 9 Demography and Group Dynamics of Western Hoolock Gibbons (Hoolock hoolock) in a Community Conserved Village Population in Upper Assam, India
- 10 Challenges and Prospects in the Conservation of Hoolock Gibbon in India
- 11 Gibbons of Assam
- 12 Movement Ecology of Siamang in a Degraded Dipterocarp Forest
- 13 Sympatric Gibbons in Historically Logged Forest in North Sumatra, Indonesia
- 14 Adopting an Interdisciplinary Biosocial Approach to Determine the Conservation Implications of the Human–Gibbon Interface
- 15 Listen to the People, Hear the Gibbons Sing
- 16 Long-Term Outcomes of Positive Cultural Value for Biodiversity
- 17 Gibbon Phylogenetics and Genomics
- 18 The Use of Microsatellites in the Management of Captive Gibbons
- Index
- References
9 - Demography and Group Dynamics of Western Hoolock Gibbons (Hoolock hoolock) in a Community Conserved Village Population in Upper Assam, India
Published online by Cambridge University Press: 13 April 2023
- Gibbon Conservation in the Anthropocene
- Gibbon Conservation in the Anthropocene
- Copyright page
- Contents
- Contributors
- Foreword
- Abbreviations
- Introduction
- 1 Taxonomy, Ecology and Conservation of Cao Vit Gibbon (Nomascus nasutus) since Its Rediscovery
- 2 Conservation Status of the Northern Yellow-Cheeked Crested Gibbon (Nomascus annamensis) in Vietnam
- 3 Strategies for Recovery of the Hainan Gibbon (Nomascus hainanus)
- 4 Gibbons in the Anthropocene
- 5 Demography of a Stable Gibbon Population in High-Elevation Forest on Java
- 6 A Tale of Two Gibbon Studies in Thailand
- 7 Accessibility as a Factor for Selecting Conservation Actions for Pileated Gibbons (Hylobates pileatus)
- 8 Calling from the Wild
- 9 Demography and Group Dynamics of Western Hoolock Gibbons (Hoolock hoolock) in a Community Conserved Village Population in Upper Assam, India
- 10 Challenges and Prospects in the Conservation of Hoolock Gibbon in India
- 11 Gibbons of Assam
- 12 Movement Ecology of Siamang in a Degraded Dipterocarp Forest
- 13 Sympatric Gibbons in Historically Logged Forest in North Sumatra, Indonesia
- 14 Adopting an Interdisciplinary Biosocial Approach to Determine the Conservation Implications of the Human–Gibbon Interface
- 15 Listen to the People, Hear the Gibbons Sing
- 16 Long-Term Outcomes of Positive Cultural Value for Biodiversity
- 17 Gibbon Phylogenetics and Genomics
- 18 The Use of Microsatellites in the Management of Captive Gibbons
- Index
- References
Summary
Fragmentation and rapid conversion of forested landscapes to farmland and human settlements in Upper Assam, India has led to the isolation of western hoolock gibbon (Hoolock hoolock) families in fragmented patches of village areas. Many families have perished due to resource scarcity and conflict with development; however, the villages of Barekuri area in Upper Assam have retained a substantial number of gibbon families for many years. We monitored the population (nine families) from 2011 to 2017 and present long-term data on social organisation and its dynamics in Barekuri area. We recorded eight births, nine deaths and four dispersals in the population. Five of the nine deaths were due to electrocution that reduced the population size from 29 individuals in nine groups in 2011 (3.22 ± SD 0.67) to 24 in seven groups in 2017 (3.29 ± SD 0.76), with a mean group size of 3.67 ± SD 0.85 which did not differ over the years. Female inter-birth intervals and ages at first reproduction are comparable with those in wild populations. Both males and females took the opportunity to form groups and breed, and male replacement and female surrogacy indicate flexibility in a pair-bond. Our observations thus support a growing knowledge of variability in the social organisation of gibbons.
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- Gibbon Conservation in the Anthropocene , pp. 131 - 146Publisher: Cambridge University PressPrint publication year: 2023