Genetic and Environmental Controls on Nitrous Oxide Accumulation in Lakes

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http://hdl.handle.net/10138/160332

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Saarenheimo , J , Rissanen , A J , Arvola , L , Nykänen , H , Lehmann , M F & Tiirola , M 2015 , ' Genetic and Environmental Controls on Nitrous Oxide Accumulation in Lakes ' , PLoS One , vol. 10 , no. 3 , 0121201 . https://doi.org/10.1371/journal.pone.0121201

Title: Genetic and Environmental Controls on Nitrous Oxide Accumulation in Lakes
Author: Saarenheimo, Jatta; Rissanen, Antti J.; Arvola, Lauri; Nykänen, Hannu; Lehmann, Moritz F.; Tiirola, Marja
Contributor: University of Helsinki, Lammi Biological Station
Date: 2015-03-10
Language: eng
Number of pages: 14
Belongs to series: PLoS One
ISSN: 1932-6203
URI: http://hdl.handle.net/10138/160332
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 nosZ(I) and nosZ(II)) 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, nosZ(I), and nosZ(II) 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)/nosZ(I) gene ratio. In addition, the ratios of (nirS+ nirK)/nosZ(I) at the inter-lake scale and (nirS+ nirK)/nosZ(I+II) within Lake Vanajavesi correlated positively with nitrate availability. The results suggest that ambient nitrate concentration can be an important modulator of the N2O accumulation in lake ecosystems, either directly by increasing the overall rate of denitrification or indirectly by controlling the balance of nitrite versus N2O reductase carrying organisms.
Subject: DENITRIFYING BACTERIA
MICROBIAL COMMUNITY
NATURAL WATERS
RIBOSOMAL-RNA
END-PRODUCT
NOSZ GENES
DENITRIFICATION
NITRATE
SOILS
N2O
1172 Environmental sciences
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