The American 'Cheetah' Wasn't a Cheetah After All

Topic: Biology

Scientists at UC Santa Cruz re-examined the extinct North American predator Miracinonyx trumani. They found that it was not a cheetah, but a close relative of the puma. The study also revealed how M. trumani adapted to different environments and diets.

New research led by scientists at the University of California, Santa Cruz, has changed what we know about Miracinonyx trumani, an extinct North American predator often called the American cheetah.

The study used nuclear paleogenomes and stable isotopes to analyze M. trumani's DNA. This showed that it was not a cheetah, but a highly adaptable close relative of the puma. In fact, the two species split from each other about 2.6 million years ago.

M. trumani lived in different environments, including temperate grasslands and Arctic tundras. In these areas, it had different roles as a predator. In places like Wyoming and Florida, it was a generalist predator that hunted various prey. However, in the Arctic Yukon, M. trumani specialized in catching fish, such as salmon.

The study found that adult M. trumani weighed about 150 pounds on average, stood roughly 3 feet tall, and measured around 8 feet from head to tail. Its slim body and long front legs may have helped it travel efficiently through open landscapes.

Researchers also discovered that M. trumani had loss-of-function mutations in certain genes that regulate circadian rhythms. This suggests that the species adapted to extreme light cycles in northern latitudes.

The study's findings change our understanding of the ecology of Ice Age North America. They also show how M. trumani was a highly versatile hunter, able to chase prey on land and use its powerful forelimbs to grab and hold it.

Why It Matters

This research matters because it helps us understand how ancient animals adapted to different environments. This knowledge can be applied to conservation efforts today, especially in areas where species are facing climate change.

Key Facts

• M. trumani was not a cheetah, but a close relative of the puma that split from it about 2.6 million years ago.
• The study found that M. trumani adapted to different environments and diets, including specializing in catching fish in the Arctic Yukon.
• Adult M. trumani weighed about 150 pounds on average and stood roughly 3 feet tall.
• M. trumani had loss-of-function mutations in certain genes that regulate circadian rhythms, suggesting it adapted to extreme light cycles.
• The study's findings change our understanding of the ecology of Ice Age North America.

Key Terms

paleogenomes

Ancient DNA sequences extracted from fossils

stable isotopes

Elements with a fixed number of neutrons in their atoms, used to analyze the diet and environment of ancient animals

Implications

This research matters because it helps us understand how ancient animals adapted to different environments. This knowledge can be applied to conservation efforts today, especially in areas where species are facing climate change.