2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 2:00 PM - 3:30 PM | Willow litter breakdown in early successional streams: Influences of nitrogen addition, weevil herbivory, plant sex, and litter type | Virtual Platform
Willow litter breakdown in early successional streams: Influences of nitrogen addition, weevil herbivory, plant sex, and litter type
Complex interactions in riparian ecosystems among plants, nutrients, and herbivores can influence organic matter dynamics in streams. The relatively young streams on the North flank of Mount St. Helens (Lawetlat’la, WA, USA) are colonized by dioecious Sitka willow (Salix sitchensis). Female willows dominate the landscape with a 2:1 sex ratio, colonize significantly closer to stream edges, produce larger inflorescences, and contribute litter in the form of leaves, wood, and catkins. In addition, a stem-boring weevil (Cryptorhynchus lapathi; Coleoptera: Curculionidae) attacks females at a higher rate and causes branch die-back and aseasonal litter fall during the summer. Male willow litter is higher in %N and has a lower C:N ratio, significantly increasing leaf litter decomposition rates for males. In experimental terrestrial plots, weevil removal and nitrogen addition differentially influenced male and female litter quality, leading to altered in-stream leaf mass loss and macroinvertebrate colonization. Plant genetics have been shown to influence ecosystem processes, and in this set of studies, we find that a genetic difference like plant sex can interact with nutrient availability, herbivore resistance, landscape heterogeneity, and aquatic community members to influence organic matter processing.
- Resource subsidies
- Ecosystem functioning
- Organic matter
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Presenters/Authors
Carri LeRoy
(), Evergreen State College, leroyc@evergreen.edu;
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Shannon Claeson
(), USFS PNW Research Station, shannon.claeson@usda.gov;
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Iris Garthwaite
(), Northern Arizona University, ig334@nau.edu;
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Debra Finn
(), Missouri State University, dfinn@missouristate.edu;
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Angie Froedin-Morgensen
(), The Evergreen State College, amorgensen@gmail.com;
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Brandy Kamakawiwo'ole
(), The Evergreen State College, kambra20@evergreen.edu;
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Victoria Cowan
(), The Evergreen State College, cowvic21@evergreen.edu;
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Lauren Thompson
(), The Evergreen State College, tholau29@evergreen.edu;
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Madeline Thompson
(), The Evergreen State College, thomad29@evergreen.edu;
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Maya Nabipoor
(), The Evergreen State College, mayanabipoor@gmail.com;
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Lily Messinger
(), The Evergreen State College, lilymessinger@gmail.com;
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Jordan Moffett
(), The Evergreen State College, jamandamoffett@gmail.com;
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Logan Lancaster
(), The Evergreen State College, lanlog02@evergreen.edu;
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Lauren Walker
(), Lewis and Clark College, walker.laurenjean@gmail.com;
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Nichole Criss
(), The Evergreen State College, nicholemcriss@gmail.com;
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Joy M. Ramstack Hobbs
(), The Evergreen State College, hobbsj@evergreen.edu;
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Mailea Miller-Pierce
(), Washington State University, m.miller-pierce@wsu.edu;
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John Bishop
(), Washington State University, bishopj@wsu.edu;
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