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Spatial and Temporal Variation in Hornbill Densities in Namdapha Tiger Reserve, Arunachal Pradesh, North-East India
| Content Provider | SAGE Publishing |
|---|---|
| Author | Naniwadekar, Rohit Datta, Aparajita |
| Copyright Year | 2013 |
| Abstract | Asian hornbill populations are declining across their ranges because of hunting and deforestation. Five of the 32 Asian hornbill species occur in north-east India. However, vital information on their abundance from the region remains scanty. Understanding spatiotemporal variation in densities provides crucial information for formulating effective conservation strategies based on species-specific abundance patterns and population trends. We examined spatiotemporal variation in densities of four hornbill species in the Namdapha Tiger Reserve, a site identified as an important site for hornbill conservation in Asia. We collected data through variable-width line transect sampling (effort=842.1 km) in the non-breeding season from 2009-12 to estimate hornbill densities. We had 458 detections of four hornbill species. We have estimated White-throated Brown Hornbill densities (7.9 birds/km2) for the first time throughout its entire range. The mean Rufous-necked Hornbill densities (6.9 birds/km2) were higher than those reported elsewhere. Great (3.9 birds/km2) and Wreathed Hornbill (16.1 birds/km2) densities were comparable with other sites. The peak densities of all hornbill species in November-December are among the highest reported from Asia. Wreathed Hornbill densities showed temporal variation peaking in November-December (68 birds/km2) and drastically declining by March-April (1.3 birds/km2), indicating seasonal altitudinal movement to low-elevation areas outside the reserve during the breeding season. Our results underscored the spatial variation in hornbill distribution, with low densities of Great and the White-throated Brown hornbills in higher elevations. Our study demonstrates the global importance of Namdapha for hornbills, given its large area and high densities of four hornbill species. |
| Related Links | https://journals.sagepub.com/doi/pdf/10.1177/194008291300600603?download=true |
| Starting Page | 734 |
| Ending Page | 748 |
| Page Count | 15 |
| ISSN | 19400829 |
| Issue Number | 6 |
| Volume Number | 6 |
| Journal | Tropical Conservation Science (TRC) |
| e-ISSN | 19400829 |
| DOI | 10.1177/194008291300600603 |
| Language | English |
| Publisher | Sage Publications CA |
| Publisher Date | 2013-12-01 |
| Publisher Place | Los Angeles |
| Access Restriction | Open |
| Rights Holder | © 2013 Rohit Naniwadekar and Aparajita Datta. |
| Subject Keyword | White-throated Brown Hornbill Ptilolaemus austeni Wreathed Hornbill Rhyticeros undulatus Eastern Himalaya Great Hornbill Buceros bicornis Rufous-necked Hornbill Aceros nipalensis |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecology Nature and Landscape Conservation |
