thumbnail

Tigers and their prey: Predicting carnivore densities from prey abundance

Proceedings of the National Academy of Sciences

6150_Karanth.pdf
By:
, , , ,

Links

Abstract

The goal of ecology is to understand interactions that determine the distribution and abundance of organisms. In principle, ecologists should be able to identify a small number of limiting resources for a species of interest, estimate densities of these resources at different locations across the landscape, and then use these estimates to predict the density of the focal species at these locations. In practice, however, development of functional relationships between abundances of species and their resources has proven extremely difficult, and examples of such predictive ability are very rare. Ecological studies of prey requirements of tigers Panthera tigris led us to develop a simple mechanistic model for predicting tiger density as a function of prey density. We tested our model using data from a landscape-scale long-term (1995-2003) field study that estimated tiger and prey densities in 11 ecologically diverse sites across India. We used field techniques and analytical methods that specifically addressed sampling and detectability, two issues that frequently present problems in macroecological studies of animal populations. Estimated densities of ungulate prey ranged between 5.3 and 63.8 animals per km2. Estimated tiger densities (3.2-16.8 tigers per 100 km2) were reasonably consistent with model predictions. The results provide evidence of a functional relationship between abundances of large carnivores and their prey under a wide range of ecological conditions. In addition to generating important insights into carnivore ecology and conservation, the study provides a potentially useful model for the rigorous conduct of macroecological science.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Tigers and their prey: Predicting carnivore densities from prey abundance
Series title:
Proceedings of the National Academy of Sciences
Volume
101
Issue:
14
Year Published:
2004
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
4854-4858
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Proceedings of the National Academy of Sciences
First page:
4854
Last page:
4858
Number of Pages:
5