Nutrient enrichment intensifies the effects of warming on metabolic balance of stream ecosystems
Climate warming and eutrophication are leading drivers of environmental change, and both are likely to alter the role of freshwaters in the global carbon cycle. Recent studies demonstrate that warming of streams can increase freshwater contributions of CO2 to the atmosphere, yet little is known abou...
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Published in | Limnology and oceanography letters Vol. 7; no. 4; pp. 332 - 341 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Hoboken, USA
John Wiley & Sons, Inc
01.08.2022
Wiley |
Subjects | |
Online Access | Get full text |
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Summary: | Climate warming and eutrophication are leading drivers of environmental change, and both are likely to alter the role of freshwaters in the global carbon cycle. Recent studies demonstrate that warming of streams can increase freshwater contributions of CO2 to the atmosphere, yet little is known about how such contributions are modulated by the identity or supply of limiting nutrients. We quantified responses of ecosystem metabolism and metabolic balance to whole‐stream enrichments of either nitrogen or phosphorus across a 5°C range of ambient temperature. We show that nutrient enrichment drove large reductions in net ecosystem production, and interactions with temperature amplified these effects in warm N‐enriched streams. Partitioning of autotrophic and heterotrophic respiration revealed that these responses were driven by increased respiration of microbial heterotrophs. Our study provides direct experimental evidence that warming‐induced increases in CO2 emissions to the atmosphere are likely intensified in stream ecosystems subject to eutrophication. |
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Bibliography: | All data and code used in this study are available at Associate editor Data Availability James B. Heffernan https://github.com/hood211/IceMetab2.git WFC and JMH co‐led the manuscript and contributed equally. WFC, JMH, JPB, ADH, and JRW conceived the study and approach. WFC, JMH, JPB, and ADH, and JRW conducted experiments and collected the data. WFC and JMH analyzed the data. WFC and JMH wrote the manuscript and all authors contributed to additional drafts and revision. Author Contribution Statement . These authors contributed equally to the paper. |
ISSN: | 2378-2242 2378-2242 |
DOI: | 10.1002/lol2.10244 |