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To Avoid Humans, Tigers Take Night Shift

A tiger’s eyes glow during the night on the same foot paths and roads humans use during the day to collect wood and grasses. (Center for Systems Integration and Sustainability, Michigan State University)
A tiger’s eyes glow during the night on the same foot paths and roads humans use during the day to collect wood and grasses. (Center for Systems Integration and Sustainability, Michigan State University)
Rosanne Skirble
Tigers don’t have a reputation for being very accommodating, but a new study challenges the long-held conservation belief that these large carnivores need lots of people-free space.  

This new understanding is especially critical because, since the start of the 20th century, the tiger population has declined by 97 percent to approximately 3,000 worldwide largely due to loss of habitat from encroaching cities and agriculture.  

Captured on camera

Michigan State University graduate student Neil Carter set up motion-detecting camera traps in and around Nepal’s Chitwan National Park to study human-tiger interaction.

The park, nestled in a valley of the Himalayas and protected by army patrols, is home to about 120 tigers.
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But the area is home to people, too. Tourists visit the park and local villagers live on its periphery, where tigers also roam.  

Carter says the cameras, at 80 different sites, captured intense activity inside and outside the park.  

“What we started seeing was tigers were everywhere, people were everywhere and obviously they could not have been in the exact same places at the exact same time because there will be reports of all kinds of conflicts, left and right," he says. "So what we ended up discovering was that the tigers were displacing their time and becoming more active at night instead of during the day.”

Switch to night shift
 
While tigers typically move around at any time of the day or night, the camera images show that the vast majority of the big cats were more active at night, even roaming outside the park on the same dirt roads and narrow footpaths used by humans. Carter was surprised to find the tigers shifted their activities in time, but not space, despite such intense human presence. 

  • Chitwan National Park, at the foot of the Himalayas in Nepal, is famous for its tigers. Credit: Center for Systems Integration and Sustainability, Michigan State University
  • Michigan State University PhD student Neil Carter readies equipment for field work to study human tiger interaction. Credit: Center for Systems Integration and Sustainability, Michigan State University
  • Crossing into Chitwan National Park, the first National Park of Nepal and a UNESCO World Heritage site. Credit: Center for Systems Integration and Sustainability, Michigan State University
  • Researchers check out trails for locations to install motion-detecting camera traps. Credit: Center for Systems Integration and Sustainability, Michigan State University
  • Neil Carter straps cameras on trees along footpaths and narrow roads inside and outside the park . Credit: Center for Systems Integration and Sustainability, Michigan State University
  • Each camera trap uses two cameras to capture both sides of a tiger, as each cat's stripes are unique and are used to identify them. Credit: Center for Systems Integration and Sustainability, Michigan State University
  • While tigers roam at all times of day, most tigers in study area had switched to hunting, mating and monitoring their territory at night. Credit: Center for Systems Integration and Sustainability, Michigan State University
  • Typically shy, tigers stay away from humans by choice. Credit: Center for Systems Integration and Sustainability, Michigan State University
  • A tiger’s eyes glow during the night on the same foot paths and roads that humans use during the day to collect wood and grasses. Credit: Center for Systems Integration and Sustainability, Michigan State University.
  • A pair of tigers rest safely at night on a trail that is patrolled during the day to guard against poaching . Credit: Center for Systems Integration and Sustainability, Michigan State University.


“There was no relationship between the number of vehicles or people or even different types of people. Tigers were there. They were everywhere. They were widespread and ubiquitous and also the prey, their prey, was really abundant," he says. "And so that I think is really sort of the critical link. Tigers are not going to leave an area that has their food.”

New hope for endangered wildlife

Carter says the results of the study could change conservation management, especially since about 80 percent of tiger habitat is now dominated by humans.  He says the key will be to figure out what conditions foster the co-existance the study documents.

“We want to see if we can duplicate that in all these multiple use forests and areas where tigers occur, but people also depend on those forests.”

Carter says the study, published in the Proceedings of the National Academy of Sciences, shows promise that humans and wildlife can thrive in the same environment, but that more work must be done to understand the complicated connection between the two worlds.

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Comment Sorting
Comments
     
by: Atsuko
September 11, 2012 2:55 AM
I think that human life is more important than wildlife.


by: Thy from: Vietnam
September 10, 2012 4:38 PM
Humans and tigers are living in the same planet, aren't they?


by: Rob Robertson from: Canada
September 09, 2012 11:19 AM
After reading this story I come to the conclusion that both humans and tigers need the forest to exist. My solution would be to plant more trees.

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