2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 3:15 PM - 3:30 PM | EXPERIMENTAL NUTRIENT ENRICHMENT STIMULATES MULTIPLE TROPHIC LEVELS THROUGH ALGAL AND DETRITAL FOOD WEB PATHWAYS: A GLOBAL META-ANALYSIS FROM STREAMS AND RIVERS | 250 AB
EXPERIMENTAL NUTRIENT ENRICHMENT STIMULATES MULTIPLE TROPHIC LEVELS THROUGH ALGAL AND DETRITAL FOOD WEB PATHWAYS: A GLOBAL META-ANALYSIS FROM STREAMS AND RIVERS
Anthropogenic increases in dissolved nitrogen (N) and phosphorus (P) strongly influence river and stream ecosystems. Quantifying biological responses to elevated nutrient concentrations is a research priority for basic and applied scientists, but there has been no comprehensive assessment of nutrient enrichment effects across lotic ecosystems. We conducted a global meta-analysis of published studies that experimentally increased concentrations of N or P in streams and rivers to examine how enrichment alters rate and state variables at multiple trophic levels. Our synthesis included 184 studies, 880 experiments, and 3500 biotic responses to nutrient enrichment. We documented widespread increases in biomass (+43.2 ± 2.0%) and production (+32.2 ± 2.9%) across all trophic levels (microbial heterotroph, primary producer, primary and secondary consumers, integrated ecosystem), with no significant differences among trophic levels. Responses to nutrient enrichment were moderated by water temperature, background concentrations of inorganic N and P, and light availability. Our meta-analysis revealed critical knowledge gaps including uncertainty in long-term consumer and whole-stream responses, due to the brief duration of most experiments. Overall, multiple food web pathways and trophic levels in lotic ecosystems are fundamentally altered by increased concentrations of N and P.
- Nitrogen
- Phosphorous
- Algae
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Presenters/Authors
Marcelo Ardon
(), North Carolina State University, mlardons@ncsu.edu;
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Lydia Zeglin
(), Kansas State University, lzeglin@ksu.edu;
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Ryan Utz
(), Chatham University, rutz@chatham.edu;
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Scott Cooper
(), University of California Santa Barbara, scott.cooper@lifesci.ucsb.edu;
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Walter Dodds
(), Kansas State University, wkdodds@ksu.edu;
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Rebecca Bixby
(), University of New Mexico, bbixby@unm.edu;
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Ayesha Burdett
(), River Bend Ecology, Australia, Ayesha.Burdett@gmail.com ;
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Jennifer Follstad Shah
(), University of Utah, jennifer.shah@envst.utah.edu;
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Natalie A. Griffiths
(), Oak Ridge National Laboratory, griffithsna@ornl.gov;
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Tamara Harms
(), University of Alaska Fairbanks, tamara.harms@alaska.edu;
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Laura Johnson
(), Heidelberg University, ljohnson@heidelberg.edu;
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Sherri Johnson
(), U.S. Forest Service, Pacific Northwest Research Station, sherrijohnson@fs.fed.us;
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Jeremy Jones
(), University of Alaska Fairbanks, jbjonesjr@alaska.edu;
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John kominoski
(), Florida International U., jkominoski@gmail.com;
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William H. McDowell
(), University of New Hampshire, bill.mcdowell@unh.edu;
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Amy Rosemond
(), University of Georgia, rosemond@uga.edu;
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Matt Trentman
(), Flathead Lake Biological Station, University of Montana, matt.trentman@flbs.umt.edu;
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David Van Horn
(), University of New Mexico, vanhorn@unm.edu ;
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Amelia Ward
(), University of Alabama, award@ua.edu;
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