Genetic and Environmental Controls on Nitrous Oxide Accumulation in Lakes
Saarenheimo, J., Rissanen, A., Arvola, L., Nykänen, H., Lehmann, M. F., & Tiirola, M. (2015). Genetic and Environmental Controls on Nitrous Oxide Accumulation in Lakes. PLoS ONE, 10(3), Article e0121201. https://doi.org/10.1371/journal.pone.0121201
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PLoS ONETekijät
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2015Tekijänoikeudet
© 2015 Saarenheimo et al. This is an
open access article distributed under the terms of the
Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any
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credited.
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 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.
...
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Ellei muuten mainita, aineiston lisenssi on © 2015 Saarenheimo et al. This is an
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