In contrast, the authors point to two of India's premier tiger reserves to show how lack of connectivity can preclude tiger population recovery. Tigers disappeared from Sariska and Panna tiger reserves in 2005 and 2009 due to poaching and were not able to re-colonize because these reserves are not connected to other reserves through habitat corridors. Consequently, wild tigers had to be translocated into these reserves to attempt to re-establish populations.

Besides poaching and habitat loss, the $7.5 trillion in infrastructure projects like roads, dams and mines that will be invested in Asia over the next decade threatens tiger landscapes. A focus only on core sites and protected areas like reserves, instead of larger landscapes, could be seen by developers and politicians as a green light to move forward with harmful infrastructure projects outside of core sites.

"Without strong countervailing pressures, short-term economic gains will inevitably trump protection of the critical ecosystems necessary for sustainable development," said Keshav Varma, Program Director of the Global Tiger Initiative at the World Bank.

The authors insist that conservationists and governments must be involved in helping design infrastructure projects to mitigate their impacts on tigers both inside core sites and in current and potential forest corridors. A recently built oil depot in India's Terai Arc, for example, severed a vital elephant and tiger corridor. Conservationists are now in litigation to remove the depot. Early intervention could have avoided this.

"Following the St. Petersburg Declaration, Nepal has committed to the goal of doubling wild tiger numbers across our country by 2022," said Deepak Bohara, Nepal's Minister for Forests and Soil Conservation.

"This analysis shows that it can be done, not just in Nepal, but, if done right with careful study and planning, across the entire tiger range. It is also worth noting that the tiger conservation provides carbon credits, protects water resources, and complements community development efforts. Thus, it is important to promote regional cooperation to maintain a healthy tiger corridor between different reserves."