2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/25/2021 | 8:30 AM - 10:30 AM | DIFFERENTIAL HYPORHEIC ZONE DEVELOPMENT AMONG YOUNG STREAM CHANNELS ON THE PUMICE PLAIN OF MOUNT ST HELENS (CASCADE RANGE, USA) | Virtual Platform

DIFFERENTIAL HYPORHEIC ZONE DEVELOPMENT AMONG YOUNG STREAM CHANNELS ON THE PUMICE PLAIN OF MOUNT ST HELENS (CASCADE RANGE, USA)

The 1980 Mount St Helens eruption deposited a massive volume of ash and rock, creating a sterile landscape of ~15 km2 known as the Pumice Plain. Multiple stream channels formed on the Pumice Plain and have contrasting patterns of primary ecological succession, including different benthic macroinvertebrate communities. Because many invertebrates use hyporheic zone (HZ) habitat during their life cycles, we asked if differential HZ development among streams could help explain variation in the benthos. In 2019, we installed four wells in each of four streams to 30-cm depth. We pump-sampled wells in July, August, and October. HZ communities were not well-developed in any stream, largely due to thin alluvial layers atop compacted ash typically within 30 cm beneath streambeds. However, one stream had at least 2 orders of magnitude greater HZ biomass than the other three combined and supported unique insects and crustaceans. Supply of course sediments from the upper catchment and channel stability associated with dense riparian vegetation likely have accelerated physical development of the HZ here compared to other streams. Pumice Plain streams provide a rare opportunity monitor the interplay between physical channel evolution and ecosystem primary succession.

Connectivity
Ecotones
Habitat

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Presenters/Authors

Debra Finn (), Missouri State University, dfinn@missouristate.edu;