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. 2016 Oct 25;7:1691. doi: 10.3389/fmicb.2016.01691

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Copyright © 2016 Highton, Roosa, Crawshaw, Schallenberg and Morales.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Denitrification enzyme activity (DEA; N₂O production h^-1) over 18 lake sites. Sediment samples were amended with nitrate + carbon (glucose) (A,B) or nitrate only (C,D) and N₂O emissions measured over 6 h. Map figures (B) and (D) represent 18 data points interpolated by kriging.