KATHMANDU/NEW DELHI Media outlets in Nepal were abuzz recently with reports that the countrys iconic Bengal tigers (Panthera tigris tigris), on whose protection the government and various NGOs lavish huge sums of money every year, were moving to India in search of better habitats.
The story resonated with the public, in a country where thousands of Nepalis cross the open border daily into the southern neighbor in search of better jobs and incomes .
As India is doing a better job at managing its tiger habitats, Nepali tigers are crossing the border to move to greener pastures, one media report said.
Following the reports, Nepals Department of National Parks and Wildlife Reserves said it was preparing plans to encourage Nepali wild animals to stay in Nepal.
The episode highlights one of the key human-induced challenges facing efforts to conserve the Bengal tiger population in its joint stronghold of Nepal and India : animal nationalism, or the belief that certain wildlife belong to a particular country.
A century ago, there were an estimated more than 100,000 wild tigers across Asia. By the early 2000s, their number had plummeted by 95%, largely due to poaching and habitat loss and fragmentation. During this time, three subspecies the Java, Bali and Caspian tigers went extinct.
In 2010, the governments of tiger range countries committed to doubling the tiger population by 2022, the year of the tiger in the Chinese zodiac. Since then, the population of Bengal tigers has bounced back, with Nepal and India leading the way toward achieving the goal.
On July 29, International Tiger Day, Nepal is expected to announce the achievement of the goal of doubling the population, at least in some of its protected areas.
Tigers have historically moved freely between ranges in Nepal and India, establishing a rich genetic pool. When we radio-collared 10 tigers in Nepal and India [in] 2013, we found that they were frequenting both India and Nepal, said Baburam Lamichhane, a conservation biologist at the National Trust for Nature Conservation, a semi-governmental body in Nepal.
However, these movements are becoming increasingly restricted due to a host of challenges, and compounded by a sense of animal nationalism that threatens to fragment populations in the two countries.
Animals dont care which land belongs to Nepal and which land belongs to India, says conservationist Narendra Man Babu Pradhan, a former warden of Nepals Chitwan National Park who now works with IUCN, Nepal. But it hasnt been easy for humans to understand that.
Governments and NGOs on both sides of the border spend a lot of money and resources trying to shore up the population of tigers. As their performance is judged by the number of tigers counted in the census, the cross-border movement of tigers becomes an accounting problem.
But the notion of national tigers was discredited in the late 1990s when conservationists realized that conserving tigers in isolated protected areas would never be an adequate strategy. A study commissioned by the Save the Tiger Fund and conducted by WWF and the Wildlife Conservation Society developed a new approach for tiger conservation. They came up with the idea of tiger conservation units, habitat blocks across the tigers global range with the best potential to recover and secure their populations. The TCU analysis originally identified six units across south-central and western Nepal and northwestern India.
These units were separated from one another by degraded habitat that was likely a barrier to tiger dispersal. It was agreed that conservation efforts should focus on creating habitat connectivity between these six TCUs by restoring forest habitats and corridors to facilitate the tigers movement. This would result in a large and connected landscape extending from Nepals Bagmati River in the east to Indias Yamuna River in the west, called the Terai Arc landscape.
In recent decades, rapid human population growth and land-use change, especially the building of new roads, in this landscape has led to deforestation and expansion of human settlements.
This means that wildlife that could historically move from one country to another along the 1,850-kilometer (1,150-mile) border are now limited to a few corridors that run across it. These corridors connect key tiger habitats such Pilibhit in Indian with Shuklaphanta in Nepal; Dudhwa with various community forests in Nepal; and Katerniaghat with Bardiya National Park, says Pranav Chanchani, national lead for tiger conservation at WWF-India.
Some corridors have already been affected by Nepals roads; their effect on tiger movement has yet to be ascertained, said Lamichhane. Although Nepal recently issued a set of guidelines for the construction of wildlife-friendly infrastructure, these are not yet fully implemented. Similar border roads are being built in India.
A recent study suggests that when roads run close to protected areas, wildlife is threatened not just with being hit by vehicles. They also face the fragmentation or loss of their habitat, reduced genetic connectivity, and increased poaching. The new border roads being planned in both countries could have deleterious impacts on tiger movement and ultimately the species survival, unless appropriate mitigation structures are expediently built, Chanchani said.
As the human population increases on the fertile plains, vehicle traffic is expected to pick up on these roads, increasing the risk for the endangered animals. Prachi Thatte, who studies connectivity conservation genetics at WWF-India, said genetic studies on tigers reveal that high-traffic roads act as barriers to their movement.
Even the existing national highways connecting major city centers may be permeable to tiger movement on stretches with low traffic volumes and when other landscape features facilitate movement. This is corroborated by data from radio-collared tigers that have been observed to cross national highways at night when the traffic is low, Thatte told Mongabay-India.
While roads with moderate to low traffic are not complete barriers, they do obstruct gene flow, likely due to the risk of deaths. Although tigers are currently known to navigate across low-traffic roads, this is bound to change in the future as traffic is projected to increase and roads will likely be widened to accommodate increasing traffic volumes, Thatte added.
A 2018 report by Indias National Tiger Conservation Authority recommends that roads being built along the border with Nepal avoid traversing protected areas and corridors and ensure appropriate and adequate animal passageways where alternate alignments are not possible. But the recommendations from the report havent been fully implemented, as both countries continue to build roads.
The issue of tiger movement between the two countries is further complicated by the animals behavior. While humans may build corridors to facilitate their movement, they cant force tigers to always move through these corridors, researchers say. Information from a radio-collared tiger in 2018 revealed that tiger movement between the two countries is not merely limited to these corridors but also occurs through agricultural areas and small forest fragments connected with Nepals Chure range, Chanchani said.
Tigers have even been found crossing rivers such as the Sharda (known as the Mahakali in Nepal) to move between the two countries. In one of these corridors between the Boom Range of Champawat Forest Division in India and Brahmadev in far western Nepal, tigers swim across the Sharda River for many months of the year, barring perhaps in the rainy season, Chanchani said.
Tiger movement has also been recorded in small sections of farmland in the Lagga Bagga-Shukla Phanta corridor, where the forests and grasslands of Indias Uttar Pradesh state meld into the Shukla Phanta Wildlife Sanctuary of Nepal, with the Sharda River looping around at the south and southeast.
But as farming areas see a rise in the unplanned building of infrastructure, it may not be easy for tigers to continue taking this route for long, experts say.
While theres value in looking at the transboundary landscape as a single unit in conservation action to harmonize planning and interventions for transboundary landscapes differences in forest management and governance across countries make it challenging for combined efforts, conservationists say.
A transboundary approach to conservation has been adopted in the TransBoundary Manas Conservation Area, and to an extent, also in the Terai Arc landscape.
However, given the differences in forest management and governance, security and development imperatives, and social, economic, cultural and political settings across international borders, it has not always been possible to align all relevant aspects of conservation programs, Chanchani said.
Despite the challenges the Bengal tiger faces in crossing between Nepal and India, conservationists on both sides of the border agree that the fates of the animals populations in both countries are intertwined, as is the well-being of the people living in the frontier region.
This makes International Tiger Day this July an opportunity for the range countries to look beyond population growth, said Narendra Man Singh Pradhan.
We should look at the landscape as one unit and come up with concrete efforts to facilitate the movement of tigers between borders, he said. We have no other option.
Banner Image: ABengal tiger checks out the conditions before getting into the canal at Sundarban Tiger Reserve, West Bengal, India. Photo by: Soumyajit Nandy / Creative Commons Attribution-Share Alike 4.0 International.
Feedback:Use this formto send a message to the author of this post. If you want to post a public comment, you can do that at the bottom of the page.
Citations:
Quintana, I., Cifuentes, E. F., Dunnink, J. A., Ariza, M., Martnez-Medina, D., Fantacini, F. M., . . . Richard, F. (2022). Severe conservation risks of roads on apex predators.Scientific Reports,12(1). doi:10.1038/s41598-022-05294-9
Athreya, V., Navya, R., Punjabi, G. A., Linnell, J. D., Odden, M., Khetarpal, S., & Karanth, K. U. (2014). Movement and activity pattern of a collared tigress in a human-dominated landscape in central India. Tropical Conservation Science, 7(1), 75-86. doi:10.1177/194008291400700111
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