PROTECTING ASIAN ELEPHANTS FROM LINEAR TRANSPORT INFRASTRUCTURE

The document examines how roads, railways, and canals fragment Asian elephant habitats and increase mortality through vehicle and train collisions. It advocates for the 'mitigation hierarchy'—prioritizing avoidance over minimization and compensation—and details structural solutions such as underpasses, overpasses, and viaducts. The guide highlights specific case studies from India, China, Malaysia, Bhutan, and Bangladesh, while recommending the adoption of emerging detection technologies and standardized monitoring to ensure ecological connectivity.

• The wild Asian elephant population has declined by at least 50% since 1945, with fewer than 52,000 individuals remaining across 13 range states.
• Linear transport infrastructure (LTI) causes diverse ecological impacts, including direct mortality from collisions, aversion due to noise and lights, sensory disturbance, and the creation of movement barriers that fragment habitats.
• Major regional infrastructure initiatives, such as the Asian Highway Network, the Trans-Asian Railway, and China's Belt and Road Initiative, are projected to expand rapidly, further threatening elephant connectivity in Southeast Asia.
• Train collisions are a significant cause of mortality in India and Sri Lanka; in India, 329 elephants died from train strikes between 1987 and January 2021, with over two-thirds occurring in Assam and West Bengal.
• The 'mitigation hierarchy' is the recommended framework for reducing LTI impacts, following a strict sequence: avoid, minimize, mitigate, restore, and compensate.
• Structural mitigation measures, such as 'oversized' drainage culverts in Bhutan and elevated viaducts in Malaysia, have been shown to facilitate elephant movement, though effectiveness varies by species and design.
• In China's Xishuangbanna Nature Reserve, the use of 25 crossing structures on the Sixiao Expressway saw elephant utilization rates increase from 32% in 2006 to 72% in 2019.
• Emerging technologies for mitigation include passive infrared sensors, seismic sensors, and acoustic warning devices to detect elephants and alert drivers or deter animals from tracks.
• The guide recommends that crossing structures be aligned with historical and current movement routes based on high-quality pre-construction data.

APA

Ament, R., Tiwari, S. K., Butynski, M., Chen, B. S., Dodd, N., Gangadharan, A., Jayasinghe, N., Laur, A., Oppler, G., Phin, W. E., van der Ree, R., & Wang, Y. (n.d.). PROTECTING ASIAN ELEPHANTS FROM LINEAR TRANSPORT INFRASTRUCTURE. WWF International. https://www.worldwildlife.org/documents/417/9izehtmuji_2021_12_5_AsETWG_Primer_final_en.pdf

Chicago

Ament, Rob, Sandeep Kumar Tiwari, Melissa Butynski, Becky Shu Chen, Norris Dodd, Aditya Gangadharan, Nilanga Jayasinghe, et al. PROTECTING ASIAN ELEPHANTS FROM LINEAR TRANSPORT INFRASTRUCTURE. WWF International, n.d. https://www.worldwildlife.org/documents/417/9izehtmuji_2021_12_5_AsETWG_Primer_final_en.pdf.

Wikipedia

{{cite report |last1=Ament |first1=Rob |last2=Tiwari |first2=Sandeep Kumar |last3=Butynski |first3=Melissa |last4=Chen |first4=Becky Shu |last5=Dodd |first5=Norris |last6=Gangadharan |first6=Aditya |last7=Jayasinghe |first7=Nilanga |last8=Laur |first8=Aaron |last9=Oppler |first9=Gabriel |display-authors=etal |title=PROTECTING ASIAN ELEPHANTS FROM LINEAR TRANSPORT INFRASTRUCTURE |publisher=WWF International |url=https://www.worldwildlife.org/documents/417/9izehtmuji_2021_12_5_AsETWG_Primer_final_en.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{amentndprotecting, author = {Ament, Rob and Tiwari, Sandeep Kumar and Butynski, Melissa and Chen, Becky Shu and Dodd, Norris and Gangadharan, Aditya and Jayasinghe, Nilanga and Laur, Aaron and Oppler, Gabriel and Phin, Wong Ee and van der Ree, Rodney and Wang, Yun}, title = {{PROTECTING ASIAN ELEPHANTS FROM LINEAR TRANSPORT INFRASTRUCTURE}}, institution = {WWF International}, url = {https://www.worldwildlife.org/documents/417/9izehtmuji_2021_12_5_AsETWG_Primer_final_en.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }