Estimating the population density of Mongolian gazelles <i>Procapra gutturosa</i> by driving long-distance transects. Olson, K., Fuller, T., Schaller, G., Odonkhuu, D., & Murray, M. ORYX, 39:164–169, Institute of Cell, Animal, and Population Biology, Ashworth Labs., West Mains Road, Edinburgh, EH9 3JT, United Kingdom, 2005. abstract bibtex Despite a 75% reduction in the geographic range of Mongolian gazelles Procapra gutturosa over the past 50 years, the species is still recognized as the most numerous large grassland herbivore in Asia. Its actual population size, however, is still disputed, and we therefore estimated its numbers in an 80,000 km2 area in the eastern steppe of Mongolia by driving long-distance (1,200-1,400 km) transect surveys during spring and autumn 2000-2002. Quantitative estimates of gazelle numbers are essential for understanding the causes of changes in the population, and thus devising conservation strategies to assure its long-term viability. Observed herds ranged in size from 1-4,000; among surveys, median herd sizes varied from 14-42. Density estimates varied from 10.7 gazelles km-2 in spring to 11.5 gazelles km-2 in autumn, with total population estimates of 803,820 (483,790-1,330,100 95% confidence interval) and 870,625 (499,432-1,491,278 95% confidence interval), respectively. Confidence limits were wide, and to obtain a coefficient of variation of 20%, transect lengths would need to be extended three- to four-fold. Until more efficient means for conducting population surveys can be implemented, driving long-distance transects, combined with distance analysis, seem to provide the best quantitative estimate of Mongolian gazelle populations. © 2005 FFI.
@ARTICLE{Olson2005,
author = {Olson, K.A. and Fuller, T.K. and Schaller, G.B. and Odonkhuu, D.
and Murray, M.G.},
title = {Estimating the population density of Mongolian gazelles \textit{Procapra
gutturosa} by driving long-distance transects},
journal = {ORYX},
year = {2005},
volume = {39},
pages = {164--169},
abstract = {Despite a 75% reduction in the geographic range of Mongolian gazelles
\textit{Procapra gutturosa} over the past 50 years, the species is
still recognized as the most numerous large grassland herbivore in
Asia. Its actual population size, however, is still disputed, and
we therefore estimated its numbers in an 80,000 km2 area in the eastern
steppe of Mongolia by driving long-distance (1,200-1,400 km) transect
surveys during spring and autumn 2000-2002. Quantitative estimates
of gazelle numbers are essential for understanding the causes of
changes in the population, and thus devising conservation strategies
to assure its long-term viability. Observed herds ranged in size
from 1-4,000; among surveys, median herd sizes varied from 14-42.
Density estimates varied from 10.7 gazelles km-2 in spring to 11.5
gazelles km-2 in autumn, with total population estimates of 803,820
(483,790-1,330,100 95% confidence interval) and 870,625 (499,432-1,491,278
95% confidence interval), respectively. Confidence limits were wide,
and to obtain a coefficient of variation of 20%, transect lengths
would need to be extended three- to four-fold. Until more efficient
means for conducting population surveys can be implemented, driving
long-distance transects, combined with distance analysis, seem to
provide the best quantitative estimate of Mongolian gazelle populations.
© 2005 FFI.},
address = {Institute of Cell, Animal, and Population Biology, Ashworth Labs.,
West Mains Road, Edinburgh, EH9 3JT, United Kingdom},
comment = {http://www.umass.edu/nrc/pdfs/MG%20pop%20counts.pdf},
file = {Olsonetal2005.pdf:Olsonetal2005.pdf:PDF},
keywords = {Density, Distance sampling, Estimate, Gazelles, Line transects, Mongolia,
Population, Procapra gutturosa},
owner = {Tiago},
subdatabase = {distance},
timestamp = {2007.04.11}
}
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Its actual population size, however, is still disputed, and we therefore estimated its numbers in an 80,000 km2 area in the eastern steppe of Mongolia by driving long-distance (1,200-1,400 km) transect surveys during spring and autumn 2000-2002. Quantitative estimates of gazelle numbers are essential for understanding the causes of changes in the population, and thus devising conservation strategies to assure its long-term viability. Observed herds ranged in size from 1-4,000; among surveys, median herd sizes varied from 14-42. Density estimates varied from 10.7 gazelles km-2 in spring to 11.5 gazelles km-2 in autumn, with total population estimates of 803,820 (483,790-1,330,100 95% confidence interval) and 870,625 (499,432-1,491,278 95% confidence interval), respectively. Confidence limits were wide, and to obtain a coefficient of variation of 20%, transect lengths would need to be extended three- to four-fold. 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Its actual population size, however, is still disputed, and\r\n\twe therefore estimated its numbers in an 80,000 km2 area in the eastern\r\n\tsteppe of Mongolia by driving long-distance (1,200-1,400 km) transect\r\n\tsurveys during spring and autumn 2000-2002. Quantitative estimates\r\n\tof gazelle numbers are essential for understanding the causes of\r\n\tchanges in the population, and thus devising conservation strategies\r\n\tto assure its long-term viability. Observed herds ranged in size\r\n\tfrom 1-4,000; among surveys, median herd sizes varied from 14-42.\r\n\tDensity estimates varied from 10.7 gazelles km-2 in spring to 11.5\r\n\tgazelles km-2 in autumn, with total population estimates of 803,820\r\n\t(483,790-1,330,100 95% confidence interval) and 870,625 (499,432-1,491,278\r\n\t95% confidence interval), respectively. Confidence limits were wide,\r\n\tand to obtain a coefficient of variation of 20%, transect lengths\r\n\twould need to be extended three- to four-fold. 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