EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/24/2018 | 11:45 AM - 12:00 PM | REVVING UP AND BURNING OUT? LEAF LITTER SPECIES IDENTITY AND DIVERSITY INFLUENCE WHOLE-STREAM NUTRIENT DYNAMICS | 410 B
REVVING UP AND BURNING OUT? LEAF LITTER SPECIES IDENTITY AND DIVERSITY INFLUENCE WHOLE-STREAM NUTRIENT DYNAMICS
Microbial decomposers supplement the low nutrient content of leaf litter with nutrients from the water column. At the same time, litter nutrient content and breakdown rates are strongly influenced by litter species identity. We tested the influence of litter identity and diversity on whole-stream nutrient dynamics by adding one of four different litter compositions (Cottonwood (Populus deltoides), Sycamore (Platanus occidentalis), Bur Oak (Quercus macrocarpa) and Mixed (three species mixture)) to 12 large (~20 m long) outdoor stream mesocosms. Nutrients were dosed once weekly to measure declines (removal) in water column NH4-N, NO3-N and PO4-P. Cottonwood (labile, low C:N) streams removed nutrients fastest at the beginning of the study, but slowed to where Oak (recalcitrant, high C:N) streams removed more nutrients. At the end of the study, Oak streams had higher cumulative NO3-N removal than Cottonwood streams, suggesting that slowly decomposing litter may be a longer-term nutrient sink than quickly decomposing species. Mixed litter removal was generally additive, although we observed some evidence of positive non-additivity in cumulative NO3-N removal that deserves future exploration. Litter identity could determine how and when leaf litter serves as a nutrient sink for stream ecosystems.
- Organic Matter
- Biogeochemistry
- Biodiversity
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Presenters/Authors
Caleb J. Robbins
(), Baylor University, Caleb_Robbins@baylor.edu;
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Will Matthaeus
(), Baylor University, Will_Matthaeus@baylor.edu;
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Stephen C. Cook
(), University of Oklahoma, stephencook@ou.edu;
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Lauren Housley
(), Baylor University, Lauren_Housley@baylor.edu;
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Sarah Hester
(), Baylor University, Sarah_Hester@baylor.edu;
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Matt Garbarino
(), Baylor University, Matt_Garbarino@baylor.edu;
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Erick LeBrun
(), Baylor University, Erick_LeBrun@baylor.edu;
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Swastika Raut
(), Baylor University, Swastika_Raut@baylor.edu;
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Chi-Yen Tseng
(), Baylor University, Chi-yen_Tseng@baylor.edu;
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Ryan S. King
(), Baylor University, Ryan_S_King@baylor.edu;
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