A white‑rumped vulture fitted with a radio transmitter—identified by researchers as “Z25”—provided critical movement data that helped forest officials and non‑governmental partners intervene repeatedly to protect the bird in Tamil Nadu’s Mudumalai Tiger Reserve. However, the same data could not prevent a fatal encounter with a high‑voltage transmission line on March 19, when the vulture collided with the cable and died, officials said.
What Happened
Z25 was part of a long‑term monitoring program launched in 2022 by the Wildlife Conservation Society‑India (WCS‑India) and the Tamil Nadu Forest Department. The lightweight radio‑telemetry device, attached to the bird’s back, transmitted location signals every few minutes. Researchers used the data to track the bird’s foraging routes and roosting sites, allowing rapid response when the bird entered risky zones, such as areas of intense human activity or near active construction.
On the day of the fatal incident, telemetry data indicated that Z25 was heading toward a steep ridge that runs adjacent to a 132‑kilovolt transmission line owned by the state electricity board. Despite the team’s rapid notification to forest officials, the bird struck the line before any on‑ground measures could be taken. The carcass was recovered the following morning, and a post‑mortem confirmed death from trauma caused by the collision.
Why It Matters
The incident underscores the growing threat that power infrastructure poses to soaring scavengers in the Western Ghats, a biodiversity hotspot where vulture populations have plummeted by more than 90 % since the early 2000s, largely due to diclofenac poisoning and habitat loss. Conservationists argue that while telemetry offers a powerful tool for real‑time monitoring, it cannot substitute for broader landscape‑level mitigation, such as insulating or rerouting transmission lines in key vulture corridors.
Background and Context
White‑rumped vultures (Gyps bengalensis) are large scavenging birds that play a critical role in ecosystem health by disposing of carcasses that could otherwise spread disease. In India, the species has been listed as “Endangered” under the IUCN Red List. The decline began in the early 2000s when veterinary use of the drug diclofenac poisoned vultures that fed on carcasses of treated livestock. Subsequent bans and conservation efforts have helped stabilize some populations, but threats remain.
Mudumalai Tiger Reserve, located in the Nilgiri Hills of Tamil Nadu, is part of the Nilgiri Biosphere Reserve and hosts a diverse array of wildlife, including several raptor species. The reserve’s terrain includes steep ridges, dense forests, and human settlements, making it a complex environment for wildlife management.
The WCS‑India telemetry program began in 2022 as a pilot to test whether real‑time tracking could reduce mortality from human‑induced hazards. The program involved tagging 15 white‑rumped vultures with GPS‑enabled radio transmitters and integrating the data with a mobile alert system that notified forest rangers and partner NGOs when a bird entered a high‑risk zone.
Competing Claims and Uncertainty
While the telemetry data clearly showed Z25’s trajectory toward the power line, some stakeholders question whether the bird could have been diverted earlier. Forest officials cited the rapid notification system as a success, noting that earlier incidents had been averted when the team cleared debris or temporarily closed a road to reduce disturbance. However, the power line’s fixed location and the bird’s swift flight path left little room for intervention.
A spokesperson for the Tamil Nadu Electricity Board (TNEB) stated that the transmission line had been in place for over 30 years and that routine maintenance had not identified any wildlife hazards. The board also noted that the line’s design complies with national safety standards. Yet, conservationists argue that compliance with electrical safety does not address ecological risks, and that the board has not considered installing bird‑safe markers or insulating the line in high‑risk corridors.
What to Watch Next
The Tamil Nadu Forest Department has pledged to review the incident and explore options for installing bird‑safe markers or underground cabling in high‑risk zones. WCS‑India plans to expand its telemetry program to include additional vultures and other raptors, hoping that a larger data set will strengthen the case for systemic changes to infrastructure planning.
In the coming months, the state government is expected to convene a joint task force comprising forest officials, the electricity board, and wildlife NGOs to assess the feasibility of retrofitting existing lines and incorporating wildlife considerations into future infrastructure projects. The outcome of this discussion could set a precedent for other regions in India where power lines intersect critical wildlife corridors.
Conclusion
Z25’s death highlights both the promise and limits of wildlife telemetry. Real‑time tracking can enable swift, localized interventions, yet it cannot always overcome immediate physical hazards like power lines. The incident may prompt policy discussions about integrating wildlife considerations into energy infrastructure design—a step that could benefit not only vultures but also other large birds of prey that share the region’s skies.
Sources
– “Radio telemetry almost saved this vulture,” The Hindu, March 20 2024, https://www.thehindu.com/sci-tech/energy-and-environment/radio-telemetry-almost-saved-this-vulture/article71177320.ece
Story synopsis gathered from: The Hindu – National — source
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