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Title: Experimental nitrogen and phosphorus enrichment stimulates multiple trophic levels of algal and detrital-based food webs: a global meta-analysis from streams and rivers

Journal Article · · Biological Reviews
DOI:https://doi.org/10.1111/brv.12673· OSTI ID:1786289
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [2]; ORCiD logo [5];  [6]; ORCiD logo [7]; ORCiD logo [8];  [9];  [10];  [9]; ORCiD logo [11]; ORCiD logo [12]; ORCiD logo [13]; ORCiD logo [14];  [5];  [15]
  1. North Carolina State Univ., Raleigh, NC (United States)
  2. Kansas State Univ., Manhattan, KS (United States)
  3. Chatham Univ., Pittsburgh, PA (United States). Falk School of Sustainability
  4. Univ. of California, Santa Barbara, CA (United States). Marine Science Institute
  5. Univ. of New Mexico, Albuquerque, NM (United States)
  6. River Bend Ecology, Wickliffe, VIC (Australia)
  7. Univ. of Utah, Salt Lake City, UT (United States)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Institute
  9. Univ. of Alaska, Fairbanks, AK (United States). Institute of Arctic Biology
  10. US Dept. of Agriculture (USDA), Corvallis, OR (United States). Pacific Northwest Research Station
  11. Florida International Univ., Miami, FL (United States). Southeast Environmental Research Center
  12. Univ. of New Hampshire, Durham, NH (United States)
  13. Univ. of Georgia, Athens, GA (United States). Odum School of Ecology
  14. Univ. of Notre Dame, IN (United States)
  15. Univ. of Alabama, Tuscaloosa, AL (United States)

Anthropogenic increases in nitrogen (N) and phosphorus (P) concentrations can strongly influence the structure and function of ecosystems. Even though lotic ecosystems receive cumulative inputs of nutrients applied to and deposited on land, no comprehensive assessment has quantified nutrient-enrichment effects within streams and rivers. We conducted a meta-analysis of published studies that experimentally increased concentrations of N and/or P in streams and rivers to examine how enrichment alters ecosystem structure (state: primary producer and consumer biomass and abundance) and function (rate: primary production, leaf breakdown rates, metabolism) at multiple trophic levels (primary producer, microbial heterotroph, primary and secondary consumers, and integrated ecosystem). Our synthesis included 184 studies, 885 experiments, and 3497 biotic responses to nutrient enrichment. We documented widespread increases in organismal biomass and abundance (mean response = +48%) and rates of ecosystem processes (+54%) to enrichment across multiple trophic levels, with no large differences in responses among trophic levels or between autotrophic or heterotrophic food-web pathways. Responses to nutrient enrichment varied with the nutrient added (N, P, or both) depending on rate versus state variable and experiment type, and were greater in flume and whole-stream experiments than in experiments using nutrient-diffusing substrata. Generally, nutrient-enrichment effects also increased with water temperature and light, and decreased under elevated ambient concentrations of inorganic N and/or P. Overall, increased concentrations of N and/or P altered multiple food-web pathways and trophic levels in lotic ecosystems. Finally, our results indicate that preservation or restoration of biodiversity and ecosystem functions of streams and rivers requires management of nutrient inputs and consideration of multiple trophic pathways.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1786289
Journal Information:
Biological Reviews, Vol. 96, Issue 2; ISSN 1464-7931
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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