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Published (Version of record)CC BY-NC V4.0, Open Access
Published (Version of record)CC BY-NC V4.0, Open
Journal article
Denitrification, anammox, and DNRA in oligotrophic continental shelf sediments
Limnology and oceanography, Vol.69(3), pp.621-637
03/2024
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Source: InCites
Abstract
Continental shelf sediments are considered hotspots for nitrogen (N) removal. While most investigations have quantified denitrification in shelves receiving large amounts of anthropogenic nutrient supply, we lack insight into the key drivers of N removal on oligotrophic shelves. Here, we measured rates of N removal through denitrification and anammox by the revised‐isotope pairing technique (r‐IPT) along the Northeastern New Zealand shelf. Denitrification dominated total N 2 production at depths between 30 and 128 m with average rates (± SE) ranging from 65 ± 28 to 284 ± 72 μ mol N m −2 d −1 . N 2 production by anammox ranged from 3 ± 1 to 28 ± 11 μ mol N m −2 d −1 and accounted for 2–19% of total N 2 production. DNRA was negligible in these oligotrophic settings. Parallel microbial community analysis showed that both Proteobacteria and Planctomycetota were key taxa driving denitrification. Denitrification displayed a negative correlation with oxygen penetration depth, and a positive correlation with macrofauna abundance. Our denitrification rates were comparable to oligotrophic shelves from the Arctic, but were lower than those from nutrient‐rich Pacific and Atlantic shelves. Based on our results and existing IPT measurements, the global shelf denitrification rate was reassessed to be 53.5 ± 8.1 Tg N yr −1 , equivalent to 20 ± 2% of marine N removal. We suggest that previous estimates of global shelf N loss might have been overestimated due to sampling bias toward areas with high N loads in the Northern Hemisphere.
Details
- Title
- Denitrification, anammox, and DNRA in oligotrophic continental shelf sediments
- Creators
- Henry L. S. Cheung - University of GothenburgJenny R. Hillman - University of AucklandConrad A. Pilditch - University of WaikatoCandida Savage - University of OtagoIsaac R. Santos - University of GothenburgRonnie N. Glud - University of Southern DenmarkFrancisco J. A. Nascimento - Stockholm UniversitySimon F. Thrush - University of AucklandStefano Bonaglia - University of Gothenburg
- Publication Details
- Limnology and oceanography, Vol.69(3), pp.621-637
- Publisher
- Wiley
- Grant note
- European Research Council. Grant Number: 669947 Danmarks Grundforskningsfond. Grant Number: DNRF145 Svenska Forskningsrådet Formas. Grant Number: 2017-01513 Vetenskapsrådet. Grant Number: 2020-00457
- Identifiers
- 991013165311602368
- Copyright
- © 2024 The Authors. Limnology and Oceanography published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License.
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article