Effects of CO₂ Enrichment on Benthic Primary Production and Inorganic Nitrogen Fluxes in Two Coastal Sediments

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aut.relation.articlenumber1035en_NZ
aut.relation.issue1en_NZ
aut.relation.journalScientific Reportsen_NZ
aut.relation.volume8en_NZ
aut.researcherVopel, Kay
dc.contributor.authorVopel, Ken_NZ
dc.contributor.authorDel-Río, Cen_NZ
dc.contributor.authorPilditch, CAen_NZ
dc.date.accessioned2021-07-29T03:21:46Z
dc.date.available2021-07-29T03:21:46Z
dc.date.copyright2018en_NZ
dc.date.issued2018en_NZ
dc.description.abstractOcean acidification may alter the cycling of nitrogen in coastal sediment and so the sediment-seawater nitrogen flux, an important driver of pelagic productivity. To investigate how this perturbation affects the fluxes of NOᵪ¯ (nitrite/nitrate), NH₄⁺ and O₂ , we incubated estuarine sand and subtidal silt in recirculating seawater with a CO₂ -adjusted pH of 8.1 and 7.9. During a 41-day incubation, the seawater kept at pH 8.1 lost 97% of its NOᵪ¯ content but the seawater kept at pH 7.9 lost only 18%. Excess CO₂ increased benthic photosynthesis. In the silt, this was accompanied by a reversal of the initial NOᵪ¯ efflux into influx. The estuarine sand sustained its initial NOᵪ¯ influx but, by the end of the incubation, released more NH₄⁺ at pH 7.9 than at pH 8.1. We hypothesise that these effects share a common cause; excess CO₂ increased the growth of benthic microalgae and so nutrient competition with ammonia oxidising bacteria (AOB). In the silt, diatoms likely outcompeted AOB for NH₄⁺ and photosynthesis increased the dark/light fluctuations in the pore water oxygenation inhibiting nitrification and coupled nitrification/denitrification. If this is correct, then excess CO₂ may lead to retention of inorganic nitrogen adding to the pressures of increasing coastal eutrophication.en_NZ
dc.identifier.citationScientific Reports 8, 1035 (2018). https://doi.org/10.1038/s41598-017-19051-w
dc.identifier.doi10.1038/s41598-017-19051-wen_NZ
dc.identifier.issn2045-2322en_NZ
dc.identifier.urihttps://hdl.handle.net/10292/14383
dc.publisherNatureen_NZ
dc.relation.urihttp://www.nature.com/scientificreportsen_NZ
dc.rights© The Author(s) 2018. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
dc.rights.accessrightsOpenAccessen_NZ
dc.subjectClimate-change ecology; Element cycles; Marine biology
dc.titleEffects of CO₂ Enrichment on Benthic Primary Production and Inorganic Nitrogen Fluxes in Two Coastal Sedimentsen_NZ
dc.typeJournal Article
pubs.elements-id324090
pubs.organisational-data/AUT
pubs.organisational-data/AUT/Faculty of Health & Environmental Science
pubs.organisational-data/AUT/Faculty of Health & Environmental Science/School of Science
pubs.organisational-data/AUT/Faculty of Health & Environmental Science/School of Science/Applied Ecology Department
pubs.organisational-data/AUT/PBRF
pubs.organisational-data/AUT/PBRF/PBRF Health and Environmental Sciences
pubs.organisational-data/AUT/PBRF/PBRF Health and Environmental Sciences/HA Science 2018 PBRF
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