A quiet move that has kept Dehradun’s vultures safe

Why in the News

Relocating a livestock carcass dump 2.4 km away from high-tension power infrastructure near Dehradun in Uttarakhand appears to have ended vulture deaths at the site. The finding comes from a decade-old study published in the latest issue of the Journal of Threatened Taxa, which documented electrocution mortality at Sudhauwala before the move. Electrocution from power infrastructure is the most under-reported of the threats to vultures, a group already among the most threatened birds globally after severe population declines across Asia and Africa. The case sets a low cost siting decision against a threat that conservation policy has so far organised itself around drugs and poisoning to address.

What did the Sudhauwala surveys record?

1. The survey base: The study rests on 34 surveys conducted between May 2011 and February 2014 in the Sudhauwala region of Dehradun.
2. The population observed: It recorded 743 individual vultures belonging to five species.
3. The mortality count: 46 vulture carcasses attributable to electrocution were documented in proximity to high-tension power transmission structures.
4. Which species paid most: The highest proportion of mortality relative to observations was recorded for the Himalayan griffon (Gyps himalayensis), followed by the Eurasian griffon (Gyps fulvus) and the cinereous vulture (Aegypius monachus).

Why has electrocution stayed off the vulture conservation agenda?

1. The recognised threat list excludes it: Poisoning, veterinary non-steroidal anti-inflammatory drugs (NSAIDs), food scarcity and habitat loss are the survival challenges vulture policy in India is built around.
2. The under-reporting is the point: Electrocution from power infrastructure has been the most under-reported threat, so it does not enter the mitigation measures those policies fund.
3. Siting concentrates the risk: A carcass dump placed near high-tension transmission structures draws large soaring scavengers directly into a hazard they do not otherwise encounter.

What changed after the dump was moved?

1. The intervention: Local authorities relocated the carcass dumping site about 2.4 km away from the high-risk electricity infrastructure in April 2015.
2. The birds still came: Subsequent observations indicated continued use of the new site by vultures, so the food source was not lost in the process.
3. The deaths stopped: No mortality events were recorded during the limited post-relocation monitoring.
4. Other raptors followed: The black kite (Milvus migrans) and the crested serpent eagle (Spilornis cheela) were also recorded at the relocated site.

How far does the evidence carry?

1. The surveys were not systematic: The authors state the surveys were conducted on a non-systematic basis, which limits how far the counts can be generalised.
2. The signal survives the caveat: The number of mortality events observed still suggests electrocution may represent a significant localised threat, particularly for long-lived scavengers such as vultures.
3. The follow-up stopped: No studies have been conducted at the site after 2015, so the post-relocation result rests on limited monitoring rather than sustained observation.
4. The measure is portable: Relocating carcass dumping sites away from hazardous power infrastructure is offered as a practical conservation measure that could be applied in other affected areas.

Conclusion

A single siting decision, moving a carcass dump away from transmission lines, removed a mortality source that no drug ban or breeding programme would have touched. The result stands on limited post-relocation monitoring and on surveys the authors themselves describe as non-systematic. No further study has been done at the site since 2015. The open question is whether carcass dump siting relative to transmission corridors is audited elsewhere in India, since the measure costs almost nothing and the threat it addresses is not currently counted.

Back2Basics: Himalayan Griffon (Gyps himalayensis)

1. What it is: One of the largest Old World vultures, a carrion feeding scavenger dependent on livestock and wild ungulate carcasses.
2. Range and habitat: It breeds on cliffs across the Himalaya and the Tibetan Plateau at high elevations, and descends to lower hills and adjoining plains in winter.
3. Conservation status: Listed as Near Threatened on the International Union for Conservation of Nature (IUCN) Red List, and in Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).
4. Why status differs within the genus: Its high altitude range kept it away from the veterinary drug residues in plains livestock that pushed the resident Gyps vultures of the plains into the Critically Endangered category.

Matching Previous Year Question

“[2012] Vultures which used to be very common in Indian countryside some years ago are rarely seen nowadays. This is attributed to: (a) the destruction of their nesting sites by new invasive species disease among them (b) a drug used by cattle owners for treating their diseased cattle persistent and fatal (c) scarcity of food available to them (d) a widespread, persistent and fatal disease among them ANSWER: (b)”