Amphibians

Why were the lakes in Yosemite originally fishless?

• The lakes were intentionally kept fishless by early park visitors.

• The lakes were too cold for fish to survive.

• The lakes were blocked by waterfalls after the last glacial period.

• The lakes were too small to support fish.

What positive effect has been observed after fish removal in Yosemite's lakes?

• The lakes have become deeper and clearer.

• The frogs and their related ecosystem functions have started to recover.

• The fish populations have adapted to coexist with the frogs.

• The lakes have become a popular tourist attraction.