Yosemite National Park Environmental Factors

Threats to park resources and the integrity of park ecosystems include loss of natural fire regimes, air pollutants and air-borne contaminants, global climate change, direct impacts to resources from high visitation in some areas of the park, habitat fragmentation from both outside and inside park boundaries, and the invasion of non-native plant and animal species. The park is actively attempting to control the non-native plant species that pose the most serious threat, such as spotted knapweed, yellow star-thistle, bull thistle, and Himalayan blackberry. The presence of wild turkeys, white-tailed ptarmigan, bullfrogs, introduced fish and other non-native animal species in Yosemite threaten the park's native species.

Additional Nature and Science Topics for Yosemite

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Featured Park
Rising above a scene rich with extraordinary wildlife, pristine lakes, and alpine terrain, the Teton Range stands monument to the people who fought to protect it. These are mountains of the imagination. Mountains that led to the creation of Grand Teton National Park where you can explore over two hundred miles of trails, float the Snake River or enjoy the serenity of this remarkable place.
Featured Wildlife
The pika is a close relative of the rabbits and hares, with two upper incisors on each side of the jaw, one behind the other. Being rock-gray in color, pikas are seldom seen until their shrill, metallic call reveals their presence.