In situ oxygen dynamics and carbon turnover in an intertidal sediment (Skallingen, Denmark)

Walpersdorf, E; Kühl, M; Elberling, B; Andersen, TJ; Hansen, BU; Pejrup, M; Glud, RN

In situ oxygen dynamics and carbon turnover in an intertidal sediment (Skallingen, Denmark)

Walpersdorf, E Kühl, M

Elberling, B Andersen, TJ Hansen, BU Pejrup, M Glud, RN

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Publication Type:: Journal Article
Citation:: Marine Ecology Progress Series, 2017, 566 pp. 49 - 65
Issue Date:: 2017-02-27

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Field	Value	Language
dc.contributor.author	Walpersdorf, E	en_US
dc.contributor.author	Kühl, M https://orcid.org/0000-0002-1792-4790	en_US
dc.contributor.author	Elberling, B	en_US
dc.contributor.author	Andersen, TJ	en_US
dc.contributor.author	Hansen, BU	en_US
dc.contributor.author	Pejrup, M	en_US
dc.contributor.author	Glud, RN	en_US
dc.date.issued	2017-02-27	en_US
dc.identifier.citation	Marine Ecology Progress Series, 2017, 566 pp. 49 - 65	en_US
dc.identifier.issn	0171-8630	en_US
dc.identifier.uri	http://hdl.handle.net/10453/124902
dc.description.abstract	© The authors 2017. Intertidal areas are considered to be productive habitats, but due to the challenging and dynamic environment, in situ assessments of their performance remain scarce. Here, we aimed to quantify the production and turnover of organic material in an intertidal sediment across several consecutive diel/tidal cycles and to evaluate the importance of key drivers affecting the community performance. Time-series measurements of the oxygen (O2) microdistribution across 2 sites at a silty sandflat documented extreme variability, which was mainly driven by light availability and flow conditions. Diffusion dominated the interstitial solute transport, but advective porewater transport was observed during 15% of the 9 d study period. Photosynthetic activity never exhibited light inhibition and average daytime net photosynthesis ranged between 1.01 and 11.15 mmol m-2 d-1 depending on the daily light availability, while the assessed gross primary production was ∼80% higher. When irradiance exceeded 17.2 mol photons m-2 d-1, daytime net autotrophy more than balanced the heterotrophic activity during the night (average night-time respiration, ERn: -4.01 mmol m-2 d-1). However, despite intense primary production, the integrated activity during the target autumn period was net heterotrophic with an average net ecosystem metabolism of -2.21 (span: -7.93 to 1.48) mmol O2 m-2 d-1. This study highlights the extreme temporal and spatial variation of intertidal sediments and the importance of accounting for natural in situ dynamics to correctly assess their performance and contribution to system production.	en_US
dc.relation.ispartof	Marine Ecology Progress Series	en_US
dc.relation.isbasedon	10.3354/meps12016	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	In situ oxygen dynamics and carbon turnover in an intertidal sediment (Skallingen, Denmark)	en_US
dc.type	Journal Article
utslib.citation.volume	566	en_US
utslib.for	0602 Ecology	en_US
utslib.for	0608 Zoology	en_US
utslib.for	0405 Oceanography	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	566	en_US

Abstract:

© The authors 2017. Intertidal areas are considered to be productive habitats, but due to the challenging and dynamic environment, in situ assessments of their performance remain scarce. Here, we aimed to quantify the production and turnover of organic material in an intertidal sediment across several consecutive diel/tidal cycles and to evaluate the importance of key drivers affecting the community performance. Time-series measurements of the oxygen (O2) microdistribution across 2 sites at a silty sandflat documented extreme variability, which was mainly driven by light availability and flow conditions. Diffusion dominated the interstitial solute transport, but advective porewater transport was observed during 15% of the 9 d study period. Photosynthetic activity never exhibited light inhibition and average daytime net photosynthesis ranged between 1.01 and 11.15 mmol m-2 d-1 depending on the daily light availability, while the assessed gross primary production was ∼80% higher. When irradiance exceeded 17.2 mol photons m-2 d-1, daytime net autotrophy more than balanced the heterotrophic activity during the night (average night-time respiration, ERn: -4.01 mmol m-2 d-1). However, despite intense primary production, the integrated activity during the target autumn period was net heterotrophic with an average net ecosystem metabolism of -2.21 (span: -7.93 to 1.48) mmol O2 m-2 d-1. This study highlights the extreme temporal and spatial variation of intertidal sediments and the importance of accounting for natural in situ dynamics to correctly assess their performance and contribution to system production.

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http://hdl.handle.net/10453/124902