USDA Forest Service

Mount St. Helens

Mount St. Helens National Volcanic Monument
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Mt. St. Helens
Pacific Northwest Research Station

333 SW First Avenue
Portland, OR 97204

(503) 808-2592

Pacific Northwest Research Station logo.

United States Department of Agriculture Forest Service.


High Resolution Photos


Deer mouse (photo by Charlie Crisafulli).
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For about 12 years after the eruption, the deer mouse was the dominant mammal on the pumice plain. The deer mouse also survived in the blowdown zone. (Photo by Charlie Crisafulli)
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Mudflows buried vegetation and killed animals in stream channels. Some plants survived at the margins of mudflows. (Photo by Charlie Crisafulli)
Mammal habitat sampling (photo by Charlie Crisafulli).
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A research crew checks a small mammal trap. Open, barren areas such as this one offered little habitat to small mammals and were slow to be colonized. (Photo by Charlie Crisafulli) Thomomys talpoides (photo by Charlie Crisafulli).
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As surviving gophers tunneled, they mixed underlying soil with volcanic ash. Roots and seeds flourished in the mixed soil-ash layer. (Photo by Charlie Crisafulli)

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Small mammals helped spread plant seeds and fungi spores across the volcanic landscape. By 2005, nearly all of the small mammals native to the region had returned to the blast area. (Photo by Charlie Crisafulli) Tenebrionid beetle foraging (photo by Charlie Crisafulli).
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In the 25 years since the 1980 eruption, ground-dwelling beetle communities have changed as the habitat changed. (Beetle shown here has no common name.) The early pioneer species were replaced by caterpillar-hunting beetle species as the plant cover increased and moth caterpillars fed on the plants. (Photo by Charlie Crisafulli)
Thomomys talpoides (photo by Charlie Crisafulli). 3534 x 2400 Spotted sandpipers fed and nested along the lake shores in the blast area. Four eggs are incubating in this spotted sandpiper nest of twigs, bark, and moss. (Photo by Charlie Crisafulli)
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Research ecologist holds a frog, netted during amphibian sampling in March 2005. A small steam plume rises from Mount St. Helens behind him. (Photo by Tom Iraci)


USDA Forest Service - Pacific Northwest Research Station - Mount St. Helens
Last Modified: Thursday, 14 May 2015 at 12:45:30 CDT

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