Why Did North America's Rocky Mountain Locusts Disappear?

TL;DR

North America's Rocky Mountain locusts vanished due to habitat destruction from Western colonization. This disruption severed their breeding grounds and fragmented their metapopulation, preventing recovery. Consequently, the last recorded locusts were collected in 1902, marking their ecological extinction.

Transcript

Thanks to Brilliant for supporting this episode of SciShow. Go to Brilliant.org/scishow to check out their course on Solar Energy. [♪ INTRO] Locusts are an agricultural menace. Their swarms pose a huge risk to crops on almost every continent. In fact, beginning in October 2019, massive swarms have been damaging crops in East Africa, the Middle East... Read More

Key Insights

• 🅰️ Locusts are a type of grasshopper that can transform into swarming creatures under certain conditions.
• 💁 The Rocky Mountain locust was once capable of forming massive swarms covering large areas of North America.
• 🥺 Environmental changes brought by Western colonization, such as farming and logging, disrupted the locusts' breeding grounds and led to their extinction.

Questions & Answers

Q: What triggers a grasshopper to become a locust?

Grasshoppers, particularly certain species like the desert locust, undergo a transformation into locusts when their population reaches a certain size or when they come into contact with other individuals. This triggers changes in appearance and behavior, leading to swarming behavior.

Q: Why did the Rocky Mountain locust disappear?

The disappearance of the Rocky Mountain locust in the late 19th century is believed to be caused by environmental changes brought by Western colonization. Factors such as farming, cattle grazing, logging, and the loss of beaver populations disrupted their breeding grounds and fragmented their metapopulation.

Q: Could the Rocky Mountain locust still exist in hidden populations?

While the Rocky Mountain locust is believed to be extinct, there is a small possibility that hidden populations may still exist in remote areas. However, extensive searches and genetic testing have not found any evidence of their continued existence.

Q: Did the extinction of the Rocky Mountain locust have significant ecological consequences?

The ecological consequences of the Rocky Mountain locust's extinction are uncertain. It is speculated that they might have played a role in nutrient cycling and had other ecological functions. However, other grasshopper species in North America fulfill similar roles, although not to the same extent as the locusts.

Summary & Key Takeaways

• Locusts, scientifically a type of grasshopper, have the ability to change their appearance and behavior in response to population size, forming swarms that can cause significant agricultural damage.

• The Rocky Mountain locust, once capable of swarming the size of an entire state, vanished in the 1880s and has not reappeared since.

• The disappearance may be attributed to the destruction of their preferred breeding grounds due to changes brought by Western colonizers, leading to the fragmentation of the locust metapopulation and their eventual extinction.