What did humans do that may have contributed to the decline in the mountain yellow legged frog population?

Humans have contributed to the decline in the mountain yellow-legged frog population primarily through habitat destruction and pollution. Urban development, agriculture, and logging have led to the degradation of their natural habitats. Additionally, the introduction of non-native species, such as fish, has resulted in increased predation on frog eggs and tadpoles. Climate change, driven by human activities, has also impacted their breeding and survival conditions.