Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Tigers: Big cats need cat food

23.03.2004


New model directly links tiger numbers to amount of prey, study says

Scientists from the New York-based Wildlife Conservation Society (WCS) and their collaborators from the US Geological Survey’s wildlife research center in Maryland have developed a model that shows a solid quantitative relationship between tiger numbers and the amount of prey available to these highly endangered big cats. Published in the latest edition of the Proceedings of the National Academy of Sciences, the model can not only accurately predict tiger density over a variety of habitats, but also help safeguard populations by pinpointing the causes of their decline.

The authors tested their model by sampling tiger and prey populations in 11 ecologically distinct sites in India – from grasslands to dry forests – over an eight-year period, with teams of biologists walking more than 4,200 miles to count prey animals, and setting hundreds of camera traps over 8,600 days of effort. Densities of ungulate prey such as deer, antelopes, wild cattle and wild pigs ranged from a low of 5.3 animals per square kilometer in Meghat Reserve, to more than 63 per square kilometer in Pench Reserve. The model predictions matched the measured tiger densities ranging between 3.2 to 16.8 tigers per 100 square kilometers.



According to WCS scientist Dr. Ullas Karanth, the lead author of the study, the rigorous methods and extensive field component of this study set it apart from most population ecology research, which is often carried out on smaller animals in laboratories.

"When it comes to macro-ecological studies on far-ranging landscape species like tigers and their prey, the biological, statistical and practical problems involved have proved too daunting in the past, compelling scientists to draw weak inferences, usually based on secondary data," said Dr. Karanth. "We tackled this problem head-on by immersing ourselves for eight years in the secret world of the tiger."

"Our results confirm that decline of wild tigers is primarily driven by prey-depletion caused by human hunters," Karanth added. "Conservationists should direct their concerns at reducing such negative human impacts." WCS’s conservation efforts to save tigers in India and throughout their range are featured in "Tiger Mountain," a new exhibit that opened at the Bronx Zoo last May

Stephen Sautner | WCS
Further information:
http://wcs.org/7411/?art=144915777

More articles from Ecology, The Environment and Conservation:

nachricht Scientists team up on study to save endangered African penguins
16.11.2017 | Florida Atlantic University

nachricht Climate change: Urban trees are growing faster worldwide
13.11.2017 | Technische Universität München

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Antarctic landscape insights keep ice loss forecasts on the radar

20.11.2017 | Earth Sciences

Filling the gap: High-latitude volcanic eruptions also have global impact

20.11.2017 | Earth Sciences

Water world

20.11.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>