• The Cathedral Group from the Teton Park Road

    Grand Teton

    National Park Wyoming

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  • Bears are active in Grand Teton

    Black and grizzly bears are roaming throughout the park--near roads, trails and in backcountry areas. Hikers and backcountry users are advised to travel in groups of three or more, make noise and carry bear spray. Visitors must stay 100 yards from bears. More »

  • Area closure in the area around Baxter's Pinnacle

    An area closure is in effect around Baxter's Pinnacle to protect nesting peregrine falcons. This closure precludes any climbs of Baxter's Pinnacle and usage of the walk-off gully. This closure will be in effect through 8-15-2013. More »

Disturbed Lands

Thistle weeds

Canada thistle often invades disturbed areas and is difficult to remove once established.

 

Events often take place that alter the balance of an ecosystem and affect the species within. Areas can become altered, or "disturbed," through a natural or human-caused occurrence.

Natural disturbances range from earthquakes to fires to floods to volcanic eruptions. Human-caused disturbances include road construction, agriculture, and urban/suburban development. Disturbed lands may be barren, void of plant and animal life, following an incident. Some native species of plants thrive after a disruption of the natural balance. The first returnees to a burned area, for instance, are grasses that take advantage of increased sunlight, decreased shade, increased nutrients in the soil, and lower acidity levels in the soil.

After a disturbance, the topsoil is susceptible to erosion due to landslides after rainfall. Often a disturbed area is threatened by the generation of invasive, non-native or exotic plant and animal species. This is evident along roadsides in Grand Teton National Park that contain fields of Canada thistle, houndstongue, yellow toadflax (butter and eggs), and mullein. These new species do not have natural environmental controls (e.g. predators) and can easily out-compete native species. Eventually disturbed lands may become dominated by non-native species.

Did You Know?

Close-up of trumpeter swan head

Did you know that Grand Teton National Park is home to the largest bird in North America? The Trumpeter Swan weighs 20-30 pounds and lives in the valley year-round in quiet open water.