When did locusts go extinct?

When Did Locusts Go Extinct?

The Rocky Mountain locust (Melanoplus spretus) was a species of locust that was once found in large numbers in the western United States and Canada. Unfortunately, the species is now considered extinct. The last recorded sighting of a live specimen was in 1902 in southern Canada. But when did locusts go extinct, and what were the factors that contributed to their demise?

A Brief History of the Rocky Mountain Locust

The Rocky Mountain locust was first described by scientists in the 1850s. It was a large species of locust, with some individuals reaching lengths of up to 2.5 inches (6.4 cm). The species was found in the western United States and Canada, including the states of Montana, Wyoming, Idaho, and Utah, as well as the provinces of British Columbia and Alberta.

Causes of Extinction

The extinction of the Rocky Mountain locust was likely caused by a combination of factors. Some of the most significant contributing factors include:

• Habitat destruction: The widespread settlement and development of the western United States and Canada led to the destruction of the locust’s habitat. The species was dependent on certain types of vegetation and soil, which were destroyed as the land was converted to agricultural use.
• Overgrazing: The introduction of domestic livestock to the region led to overgrazing, which further degraded the locust’s habitat and reduced the availability of food.
• Climate change: Changes in climate may have also played a role in the locust’s extinction. The Rocky Mountain locust was adapted to a specific range of temperatures and precipitation levels, and changes in these conditions may have made it difficult for the species to survive.
• Lack of predators: The Rocky Mountain locust had few natural predators, which made it vulnerable to population crashes and extinction.

Efforts to Control the Locust Population

In the late 19th century, the United States government launched a campaign to control the Rocky Mountain locust population. This effort included the use of insecticides, such as Paris green, to kill the locusts. However, these efforts were ultimately unsuccessful in preventing the species’ extinction.

Conservation Efforts

Although the Rocky Mountain locust is now extinct, there are still efforts underway to conserve its genetic legacy. Scientists have been able to recover DNA from preserved specimens of the species, which may one day be used to create a new species of locust that is resistant to the factors that contributed to the extinction of the Rocky Mountain locust.

Conclusion

The extinction of the Rocky Mountain locust is a significant event in the history of entomology. The species was once a dominant force in the western United States and Canada, but its population declined rapidly in the late 19th century due to a combination of factors. Although the species is now extinct, efforts are underway to conserve its genetic legacy and learn more about the factors that contributed to its extinction.

Timeline of Events

• 1850s: The Rocky Mountain locust is first described by scientists.
• Late 19th century: The species begins to decline in population due to habitat destruction, overgrazing, and climate change.
• 1902: The last recorded sighting of a live Rocky Mountain locust is made in southern Canada.
• 1950s: The species is declared extinct.

Table: Rocky Mountain Locust Habitat

Bibliography

• National Geographic: "Rocky Mountain Locust"
• Smithsonian Institution: "Rocky Mountain Locust"
• Encyclopedia Britannica: "Rocky Mountain Locust"
• Scientific American: "The Last of the Rocky Mountain Locusts"