How has Diclofenac impacted vulture populations globally?

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Diclofenac's Significant Impact on Vulture Populations

The widespread use of Diclofenac, a veterinary drug, has had a devastating impact on vulture populations worldwide. This non-steroidal anti-inflammatory drug, commonly administered to cattle, proved lethal to vultures when they consumed the carcasses of treated animals. The drug's toxicity led to acute kidney failure and visceral gout in vultures, resulting in rapid death.
Diclofenac's Lethal Effect on Vultures

Diclofenac was extensively used in cattle farming across South Asia, particularly in India, Pakistan, and Nepal, to treat livestock. When vultures fed on the carcasses of these treated cattle, they ingested the drug. Within days, the drug caused severe organ damage in the birds, leading to a sharp decline in their numbers. This effect was so pronounced that it drove several vulture species towards extinction.
Population Declines and Conservation Status

The impact of Diclofenac was so severe that it caused catastrophic population crashes for several vulture species. For instance, populations of the Indian vulture and the slender-billed vulture in the Indian subcontinent are estimated to have declined by over 95% in the 1990s and early 2000s due to Diclofenac poisoning. Consequently, many of these species are now listed as critically endangered on the IUCN Red List. The Himalayan griffon, mentioned in the context of a recent sighting in Singapore, is also listed as "near threatened" due to past population declines, significantly influenced by the use of such drugs.
Global Efforts to Mitigate the Threat

Recognizing the severity of the crisis, governments and conservation organizations have implemented bans on the veterinary use of Diclofenac in several countries. In India, the ban was enacted in 2006, and similar measures were adopted in Nepal and Pakistan. Conservationists also promoted the use of alternative veterinary drugs, such as meloxicam, which are not toxic to vultures. Despite these bans, the lingering presence of Diclofenac in the environment and the continued illegal use of the drug pose ongoing challenges to vulture recovery efforts.

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How has Diclofenac impacted vulture populations globally?

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