Faculty of Biology, University of Latvia
Hard copy: ISSN 1691–8088
On-line: ISSN 2255–9582
Environ Exp Biol (2023) 21: 45–52
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Environmental and

Environ Exp Biol (2023) 21: 45–52

Orginal Paper

Assessing the accuracy of population estimation methods for vulture populations: a case study from the Mudumalai Tiger Reserve, Tamil Nadu, India

S. Manigandan1*, H. Byju2*, P. Kannan3
1 Department of Zoology and Wildlife Biology, Government Arts College, Udhagamandalam 643002, India
2 Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai 608502, Tamil Nadu, India
3 Department of Zoology, Thiru.Vi.Ka. Government Arts College, Thiruvarur 610003, India
* Corresponding author, E-mail: mani.wildlife1993@gmail.com, byjuhi@gmail.com


Two resident and two local migratory vulture species are reported in the Mudumalai Tiger Reserve of the Nilgiri Biosphere Reserve. The early population estimates from the region are either scanty or crude. Vulture population estimation was performed using three different methods based on their breeding seasons and regional movements between 2019 and 2021. Road transect counts, nest counts, and carcass monitoring counts were used for population assessments. The road transect survey and nest site counting during the breeding season were conducted in all three years, while carcass monitoring was done in 2019 – 2020. For population estimation, three nest site colony counts were conducted for the resident Gyps bengalensis and for Gyps indicus. The other two methods, carcass monitoring and the road transect survey, were used for all four focal vulture species of the Mudumalai Tiger Reserve – Gyps bengalensis, Gyps indicus, Neophron percnopterus and Sarcogyps calvus. Significant variation in vulture population count was observed with different assessment methods.

Key words: cow dung, carcass monitoring, critically endangered, Moyar Valley, nest count, Nilgiri Biosphere Reserve, road transect survey, vultures.

Environ Exp Biol (2023) 21: 45–52
 DOI: http://doi.org/10.22364/eeb.21.06

Prof. Gederts Ievinsh
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