The CO2 -equivalent balance of freshwater ecosystems is non-linearly related to productivity.

Global Change Biology
Charlotte GrassetLars J Tranvik

Abstract

Eutrophication of fresh waters results in increased CO2 uptake by primary production, but at the same time increased emissions of CH4 to the atmosphere. Given the contrasting effects of CO2 uptake and CH4 release, the net effect of eutrophication on the CO2 -equivalent balance of fresh waters is not clear. We measured carbon fluxes (CO2 and CH4 diffusion, CH4 ebullition) and CH4 oxidation in 20 freshwater mesocosms with 10 different nutrient concentrations (total phosphorus range: mesotrophic 39 µg/L until hypereutrophic 939 µg/L) and planktivorous fish in half of them. We found that the CO2 -equivalent balance had a U-shaped relationship with productivity, up to a threshold in hypereutrophic systems. CO2 -equivalent sinks were confined to a narrow range of net ecosystem production (NEP) between 5 and 19 mmol O2  m-3  day-1 . Our findings indicate that eutrophication can shift fresh waters from sources to sinks of CO2 -equivalents due to enhanced CO2 uptake, but continued eutrophication enhances CH4 emission and transforms freshwater ecosystems to net sources of CO2 -equivalents to the atmosphere. Nutrient enrichment but also planktivorous fish presence increased productivity, thereby regulating the resulting CO2 -equivalent ba...Continue Reading

References

Aug 22, 2002·Environmental Science & Technology·David BastvikenLars Tranvik
Nov 5, 2005·Applied and Environmental Microbiology·Ingvar SundhLars J Tranvik
Jan 8, 2011·Science·David BastvikenAlex Enrich-Prast
Nov 22, 2013·Nature·Peter A RaymondPeter Guth
Mar 29, 2014·Nature·Gabriel Yvon-DurocherPaul A del Giorgio
Mar 29, 2014·Global Change Biology·N J AndersonA F Lotter
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Aug 16, 2016·Water Research·Sarian KostenKatharina Ettwig
Nov 23, 2017·Nature Communications·Raquel MendonçaSebastian Sobek
May 2, 2018·The Science of the Total Environment·Armando Sepulveda-JaureguiFrédéric Thalasso
Sep 23, 2018·The Science of the Total Environment·Xingcheng YanHuichao Liu
Mar 28, 2019·Nature Communications·Jake J BeaulieuJohn A Downing
Feb 23, 2020·Limnology and Oceanography Letters·Tonya DelSontroJohn A Downing

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Citations

Mar 11, 2021·The Science of the Total Environment·Shoji D Thottathil, Yves T Prairie
Mar 19, 2021·Water Research·Maciej BartosiewiczIsabelle Laurion
Mar 20, 2021·The Science of the Total Environment·Yi LiHuanjun Zhang

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