Estimated density, population size and distribution of the endangered western hoolock gibbon (Hoolock hoolock) in forest remnants in bangladesh
Diversity, ISSN: 1424-2818, Vol: 13, Issue: 10
2021
- 4Citations
- 24Captures
- 5Mentions
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Most Recent News
Funding needed in hoolock gibbon conservation in Bangladesh
Sinan Serhadli Western hoolock gibbons (Hoolock hoolock), native to the forests of northeastern India, western Myanmar, and eastern Bangladesh, are among the world’s most threatened
Article Description
Tropical forests are threatened worldwide due to deforestation. In South and Southeast Asia, gibbons (Hylobatidae) are important to seed dispersal and forest regeneration. Most gibbons are threatened due to deforestation. We studied the western hoolock gibbon (Hoolock hoolock) in Bangladesh to determine population size and extent of suitable habitat. We used distance sampling to estimate density across 22 sites in northeastern and southeastern Bangladesh. We used Maxent modeling to determine areas of highly suitable habitat throughout Bangladesh. Density was estimated to be 0.39 ± 0.09groups/km, and the total estimated population was 468.96 ± 45.56 individuals in 135.31 ± 2.23 groups. The Maxent model accurately predicted gibbon distribution. Vegetation cover, isothermality, annual pre-cipitation, elevation and mean temperature of the warmest quarter influenced distribution. Two areas in the northeast and two areas in the southeast have high potential for gibbon conservation in Bangladesh. We also found significantly more gibbons in areas that had some level of official protection. Thus, we suggest careful evaluation, comprehensive surveys and restoration of habitats identified as suitable for gibbons. We recommend bringing specific sites in the northeastern and southeastern regions under protection to secure habitat for remaining gibbon populations.
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