Estimation of large herbivore densities in the tropical forests of southern India using distance sampling. Jathanna, D., Karanth, K., & Johnsingh, A. Journal of Zoology, 261(3):285–290, United Theological College, 63, Miller's Road, Bangalore-560046, Karnataka, India, 2003. abstract bibtex Ecological densities of large herbivores were estimated using the line transect method in the tropical moist forests of Bhadra Tiger Reserve, southern India, during November 2000. The species of interest were chital Axis axis, sambar Cervus unicolor, muntjac Muntiacus muntjak, gaur Bos gaurus and Hanuman langur Presbytes entellus. Six permanent transects, ranging from 2.6 to 3.6 km (totalling 18.2 km) were each walked 26 times. A total of 473 km was walked during the surveys. Numbers of detections were generally low (51, 25, 68, 17 and 302 for chital, sambar, muntjac, gaur and langur, respectively). Mean estimated densities of different species were [\hat D (± SE)]: 4.51 (± 1.05) chital km-2, 0.89 (± 0.23) sambar km -2, 3.64 (± 0.63) muntjac km-2, 1.48 (± 0.63) gaur km-2 and 22.62 (± 2.64) langur km-2. Possible shortcomings of our estimates are considered and suggestions made for improving future surveys. A comparison with densities estimated for these species in other well-protected parks showed that the chital, gaur and sambar densities in Bhadra were extremely low. The main causal factors for these low densities seem to be poaching and livestock grazing.
@ARTICLE{Jathanna2003,
author = {Jathanna, D. and Karanth, K.U. and Johnsingh, A.J.T.},
title = {Estimation of large herbivore densities in the tropical forests of
southern India using distance sampling},
journal = {Journal of Zoology},
year = {2003},
volume = {261},
pages = {285--290},
number = {3},
abstract = {Ecological densities of large herbivores were estimated using the
line transect method in the tropical moist forests of Bhadra Tiger
Reserve, southern India, during November 2000. The species of interest
were chital \textit{Axis axis}, sambar \textit{Cervus unicolor},
muntjac \textit{Muntiacus muntjak}, gaur \textit{Bos gaurus} and
Hanuman langur \textit{Presbytes entellus}. Six permanent transects,
ranging from 2.6 to 3.6 km (totalling 18.2 km) were each walked 26
times. A total of 473 km was walked during the surveys. Numbers of
detections were generally low (51, 25, 68, 17 and 302 for chital,
sambar, muntjac, gaur and langur, respectively). Mean estimated densities
of different species were [\hat D (± SE)]: 4.51 (± 1.05) chital km-2,
0.89 (± 0.23) sambar km -2, 3.64 (± 0.63) muntjac km-2, 1.48 (± 0.63)
gaur km-2 and 22.62 (± 2.64) langur km-2. Possible shortcomings of
our estimates are considered and suggestions made for improving future
surveys. A comparison with densities estimated for these species
in other well-protected parks showed that the chital, gaur and sambar
densities in Bhadra were extremely low. The main causal factors for
these low densities seem to be poaching and livestock grazing.},
address = {United Theological College, 63, Miller's Road, Bangalore-560046,
Karnataka, India},
comment = {http://journals.cambridge.org/article_S0952836903004278},
keywords = {Densities, Large herbivores, Line transects, Southern India, Tropical
moist forests, Ungulates},
owner = {Tiago},
subdatabase = {distance},
timestamp = {2006.11.23}
}
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The species of interest were chital <i>Axis axis</i>, sambar <i>Cervus unicolor</i>, muntjac <i>Muntiacus muntjak</i>, gaur <i>Bos gaurus</i> and Hanuman langur <i>Presbytes entellus</i>. Six permanent transects, ranging from 2.6 to 3.6 km (totalling 18.2 km) were each walked 26 times. A total of 473 km was walked during the surveys. Numbers of detections were generally low (51, 25, 68, 17 and 302 for chital, sambar, muntjac, gaur and langur, respectively). Mean estimated densities of different species were [\\hat D (± SE)]: 4.51 (± 1.05) chital km-2, 0.89 (± 0.23) sambar km -2, 3.64 (± 0.63) muntjac km-2, 1.48 (± 0.63) gaur km-2 and 22.62 (± 2.64) langur km-2. Possible shortcomings of our estimates are considered and suggestions made for improving future surveys. A comparison with densities estimated for these species in other well-protected parks showed that the chital, gaur and sambar densities in Bhadra were extremely low. The main causal factors for these low densities seem to be poaching and livestock grazing.","address":"United Theological College, 63, Miller's Road, Bangalore-560046, Karnataka, India","comment":"http://journals.cambridge.org/article_S0952836903004278","keywords":"Densities, Large herbivores, Line transects, Southern India, Tropical moist forests, Ungulates","owner":"Tiago","subdatabase":"distance","timestamp":"2006.11.23","bibtex":"@ARTICLE{Jathanna2003,\r\n author = {Jathanna, D. and Karanth, K.U. and Johnsingh, A.J.T.},\r\n title = {Estimation of large herbivore densities in the tropical forests of\r\n\tsouthern India using distance sampling},\r\n journal = {Journal of Zoology},\r\n year = {2003},\r\n volume = {261},\r\n pages = {285--290},\r\n number = {3},\r\n abstract = {Ecological densities of large herbivores were estimated using the\r\n\tline transect method in the tropical moist forests of Bhadra Tiger\r\n\tReserve, southern India, during November 2000. The species of interest\r\n\twere chital \\textit{Axis axis}, sambar \\textit{Cervus unicolor},\r\n\tmuntjac \\textit{Muntiacus muntjak}, gaur \\textit{Bos gaurus} and\r\n\tHanuman langur \\textit{Presbytes entellus}. Six permanent transects,\r\n\tranging from 2.6 to 3.6 km (totalling 18.2 km) were each walked 26\r\n\ttimes. A total of 473 km was walked during the surveys. Numbers of\r\n\tdetections were generally low (51, 25, 68, 17 and 302 for chital,\r\n\tsambar, muntjac, gaur and langur, respectively). Mean estimated densities\r\n\tof different species were [\\hat D (± SE)]: 4.51 (± 1.05) chital km-2,\r\n\t0.89 (± 0.23) sambar km -2, 3.64 (± 0.63) muntjac km-2, 1.48 (± 0.63)\r\n\tgaur km-2 and 22.62 (± 2.64) langur km-2. Possible shortcomings of\r\n\tour estimates are considered and suggestions made for improving future\r\n\tsurveys. A comparison with densities estimated for these species\r\n\tin other well-protected parks showed that the chital, gaur and sambar\r\n\tdensities in Bhadra were extremely low. 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