Micro-sanctuaries key to survival of wildlife in human-dominated landscapes

The authors of the study say their findings could have important implications in future land-use -- particularly in rapidly urbanizing regions where some wildlife still persist.

The researchers looked at populations of blackbuck -- a near threatened species of antelope -- in and around the Great Indian Bustard Sanctuary in Nannaj, Maharashtra in south-central India. Increasing encroachment by humans has fragmented grasslands into plantations, grazing areas and agricultural lands. The landscape is densely populated by humans and cattle and is representative of most semi-arid landscapes in India.

The researchers found that blackbuck preferred to stay in the safety of the sanctuary when food was abundant to avoid the risks associated with humans and livestock. But as food declined after the monsoon season, blackbuck began to move into riskier unprotected grasslands, thus responding dynamically to seasonally changing levels of food and risks in the different parts of the landscape.

This study finds that the presence of small sanctuaries or "refuges" in densely populated semi-arid landscapes allows these antelopes to survive, and provides clues as to why animals might be moving outside sanctuaries. A desperate search for food could thus be leading blackbuck to make seasonal changes in their movements and venture into more risky areas located outside the sanctuary.

These factors need to be taken into consideration as more grasslands are converted and developed for human use. This study shows that coexistence of conservation and development is possible, provided that wildlife are offered refuges, such as the small protected areas that constitute the Great Indian Bustard Sanctuary.

Funded by the Indian Ministry of Environment, Forests and Climate Change and the Royal Norwegian Embassy in New Delhi, this study examined how blackbuck reacted to the costs and benefits of living in this habitat. Researchers measured the amount and quality of grass, the major blackbuck food source, and identified risky areas, where blackbuck were most likely to come across wolves, dogs or humans.