Seasonal variation in denitrification and dissimilatory nitrate reduction to ammonia process rates and corresponding key functional genes along an estuarine nitrate gradient

Smith, C, Dong, L, Wilson, J, Stott, A, Osborn, A and Nedwell, D 2015, 'Seasonal variation in denitrification and dissimilatory nitrate reduction to ammonia process rates and corresponding key functional genes along an estuarine nitrate gradient', Frontiers in Microbiology, vol. 6, no. JUN, 542, pp. 1-11.


Document type: Journal Article
Collection: Journal Articles

Title Seasonal variation in denitrification and dissimilatory nitrate reduction to ammonia process rates and corresponding key functional genes along an estuarine nitrate gradient
Author(s) Smith, C
Dong, L
Wilson, J
Stott, A
Osborn, A
Nedwell, D
Year 2015
Journal name Frontiers in Microbiology
Volume number 6
Issue number JUN
Article Number 542
Start page 1
End page 11
Total pages 11
Publisher Frontiers Research Foundation
Abstract This research investigated spatial-temporal variation in benthic bacterial community structure, rates of denitrification and dissimilatory nitrate reduction to ammonium (DNRA) processes and abundances of corresponding genes and transcripts at three sites-the estuary-head, mid-estuary and the estuary mouth (EM) along the nitrate gradient of the Colne estuary over an annual cycle. Denitrification rates declined down the estuary, while DNRA rates were higher at the estuary head and middle than the EM. In four out of the six 2-monthly time-points, rates of DNRA were greater than denitrification at each site. Abundance of gene markers for nitrate-reduction (nitrate reductase narG and napA), denitrification (nitrite reductase nirS) and DNRA (DNRA nitrite reductase nrfA) declined along the estuary with significant relationships between denitrification and nirS abundance, and DNRA and nrfA abundance. Spatially, rates of denitrification, DNRA and corresponding functional gene abundances decreased along the estuary. However, temporal correlations between rate processes and functional gene and transcript abundances were not observed.
Subject Microbial Ecology
Environmental Science and Management not elsewhere classified
Marine and Estuarine Ecology (incl. Marine Ichthyology)
Keyword(s) (RT)-Q-PCR
Denitrification/DNRA
napA
narG
nirS
nrfA
DOI - identifier 10.3389/fmicb.2015.00542
Copyright notice © 2015 Smith, Dong, Wilson, Stott, Osborn and Nedwell
ISSN 1664-302X
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Citation counts: TR Web of Science Citation Count  Cited 32 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 18 times in Scopus Article | Citations
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