2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2019 | 9:00 AM - 9:15 AM | STREAM COMMUNITY ASSEMBLY 36 YEARS AFTER THE CATASTROPHIC ERUPTION OF MOUNT ST. HELENS | 254 B
STREAM COMMUNITY ASSEMBLY 36 YEARS AFTER THE CATASTROPHIC ERUPTION OF MOUNT ST. HELENS
The eruption of Mount St. Helens (WA, USA) in 1980 obliterated forests and buried streams on the mountain’s north flank by over 100m of sterile pumice. Following the eruption, springs and snowmelt created four new watersheds flowing into Spirit Lake. Community recovery was predicted to take many decades to centuries, but surveys 36 years post-eruption found significant aquatic community development. Reach-scale surveys in the four watersheds reveal large ranges in many physio-chemical characteristics including water temperature, discharge, conductivity, organic carbon, nitrate, and canopy cover. Communities of periphyton, macroinvertebrates, and riparian plants differ significantly among streams suggesting different developmental trajectories for primary succession. In one stream, only low-profile and firmly attached soft-algae taxa were observed, along with fewer riparian plants and benthic invertebrates. We suspect that continual disturbances by floods and sediment transport are keeping the aquatic and riparian communities in earlier successional states of development. The other streams are warmer with lower discharge and sediment transport, and tend support more diverse and/or abundant taxa and canopy cover. The large differences in habitat across the four watersheds provide a unique opportunity to explore in-stream community development and early stream succession.
- Periphyton
- Invertebrate
- Geomorphology
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Presenters/Authors
Shannon Claeson
(), USFS PNW Research Station, shannon.claeson@usda.gov;
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Carri LeRoy
(), Evergreen State College, leroyc@evergreen.edu;
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Rosalina Stancheva
(), California State University San Marcos, rhristov@csusm.edu;
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Emily Wolfe
(), Portland State University, Emwolfe@pdx.edu;
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