Study says government counts of tigers in India are inaccurate

May 29, 2003

(MAY 29, 2003) A method used by India's government to count tigers for the past 30-plus years has produced largely inaccurate data, resulting in poor conservation practices, according to a study led by the New York-based Wildlife Conservation Society (WCS), published in the latest issue of the journal Animal Conservation. The study was a collaboration among several leading ecologists from WCS, US-Geological Survey, WWF-USA, Smithsonian Institution, University of Minnesota and the Wildlife Institute of India.

The study says that counting tiger "pugmarks" or track prints, a technique developed in 1966 but never published in a scientific journal, is still used by India's government as the exclusive method to count tigers. Yet the method is scientifically flawed for several reasons.

The authors of the study charge that by setting itself the impossible goal of counting all individuals of a secretive species across thousands of square miles of rugged landscape, the "pugmark" census is doomed to failure. This in turn has led to field managers reporting increases in tiger numbers even in cases where mounting evidence showed protection had deteriorated.

"Trying to estimate tiger numbers across India using the pugmark census is an impossible task," said the paper's lead author Dr. Ullas Karanth, a WCS conservation zoologist who has studied tigers for the past 20 years. "Money and effort spent on counting pugmarks can be better used on simpler, statistically sound monitoring methods that can really help save tigers."

According to the study, in 1999 alone, the Indian government spent some $10 million on tiger-related conservation measures, while another $1.75 million came in non-governmental donors. However, the authors say that it is virtually impossible to measure the effectiveness of this investment using traditional monitoring methods.

Karanth and his co-authors say that "statistically robust" alternatives should be adopted to monitor tigers in India, where most of the world's tigers still live. These include sample surveys to map the presence or absence of tigers throughout their range. For important reserves that contain tigers, park personnel should use "encounter-rate" surveys, which monitor tigers by counting samples of not only tiger tracks, but also other signs. Such simple indices can track tiger numbers adequately for management purposes.

Lastly, in a few critically important reserves where there is need to know actual tiger numbers, the use of advanced techniques such as remote "camera-traps," and measuring prey densities is essential, the paper argues.

The Wildlife Conservation Society is working to save tigers throughout their range, with field conservation projects in not only India, but also the Russian Far East, China, Thailand, Myanmar, Indonesia and Malaysia. Earlier this month, at its flagship Bronx Zoo headquarters, WCS opened "Tiger Mountain," a spectacular three-acre, interactive tiger exhibit that links zoo visitors with some of these field conservation efforts.
CONTACT: Stephen Sautner (718-220-3682;
John Delaney (718-220-3275;

Wildlife Conservation Society

Related Tigers Articles from Brightsurf:

Big cats and small dogs: solving the mystery of canine distemper in wild tigers
Canine distemper virus (CDV) causes a serious disease in domestic dogs, and also infects other carnivores, including threatened species like the Amur tiger.

Camera trap study captures Sumatran tigers, clouded leopards, other rare beasts
Scientists deployed motion-sensitive camera traps across a 50-square-mile swath of Bukit Barisan Selatan National Park in southern Sumatra and, over the course of eight years, recorded the haunts and habits of dozens of species, including the Sumatran tiger and other rare and endangered wildlife.

Study: yes, even wild tigers struggle with work/life balance
A new study by a team of Russian and American scientists revealed the first-ever detailed analysis of a tigress from the birth of her cubs through their first four months.

Mental health disorders rife in post-conflict areas
A new study has found that 58 percent of people displaced following the civil war in Sri Lanka have suffered mental health problems.

Climate change may destroy tiger's home
A James Cook University scientist says the last coastal stronghold of an iconic predator, the endangered Bengal tiger, could be destroyed by climate change and rising sea levels over the next 50 years.

Urbanization may hold key to tiger survival
A new WCS-led study published in the journal Biological Conservation says the future of tigers in Asia is linked the path of demographic transition -- for humans.

NSU researcher part of team that conducted genome-wide study of tigers
Study brings important context and conclusions to recovery and management strategies for a treasured endangered species, and included subspecies, at high extinction risk.

Genome-wide study confirms 6 tiger subspecies
Fewer than 4,000 free-ranging tigers remain in the wild. Efforts to protect these remaining tigers have also been stymied by uncertainty about whether they represent six, five or only two subspecies.

Research methods that find serial criminals could help save tigers
A geographic profiling tool used to catch serial criminals could help reduce the casualties of human-tiger conflict, according to scientists who collaborated on an innovative conservation research study.

Tigers cling to survival in Sumatra's increasingly fragmented forests
A research expedition tracked endangered tigers through the Sumatran jungles for a year and found tigers are clinging to survival in low density populations.

Read More: Tigers News and Tigers Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to