Genetic and environmental controls on nitrous oxide accumulation in lakes

PloS One
Jatta SaarenheimoMarja Tiirola

Abstract

We studied potential links between environmental factors, nitrous oxide (N2O) accumulation, and genetic indicators of nitrite and N2O reducing bacteria in 12 boreal lakes. Denitrifying bacteria were investigated by quantifying genes encoding nitrite and N2O reductases (nirS/nirK and nosZ, respectively, including the two phylogenetically distinct clades nosZI and nosZII) in lake sediments. Summertime N2O accumulation and hypolimnetic nitrate concentrations were positively correlated both at the inter-lake scale and within a depth transect of an individual lake (Lake Vanajavesi). The variability in the individual nirS, nirK, nosZI, and nosZII gene abundances was high (up to tenfold) among the lakes, which allowed us to study the expected links between the ecosystem's nir-vs-nos gene inventories and N2O accumulation. Inter-lake variation in N2O accumulation was indeed connected to the relative abundance of nitrite versus N2O reductase genes, i.e. the (nirS+nirK)/nosZI gene ratio. In addition, the ratios of (nirS+nirK)/nosZI at the inter-lake scale and (nirS+nirK)/nosZI+II within Lake Vanajavesi correlated positively with nitrate availability. The results suggest that ambient nitrate concentration can be an important modulator of t...Continue Reading

References

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Citations

May 11, 2017·Frontiers in Microbiology·Jatta SaarenheimoMarja Tiirola
Oct 24, 2017·Frontiers in Microbiology·Antonio Castellano-HinojosaJuan M Medina-Sánchez
Aug 15, 2017·Trends in Microbiology·Sara HallinChristopher M Jones
Sep 19, 2019·Environmental Science & Technology·Xia LiangSiliang Li
Oct 26, 2018·Environmental Science & Technology·Sari UusheimoLauri Arvola
Dec 27, 2021·The Science of the Total Environment·Siyan ZhaoGuibing Zhu

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Methods Mentioned

BETA
PCR

Software Mentioned

PASW
PASW Statistics
SPSS

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