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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Oxygen budgets in subtidal arctic (Kongsfjorden, Svalbard) and temperate (Helgoland, North Sea) microphytobenthic communities
Marine Ecology Progress Series, Volume 504, Year 2014
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Description
We compared primary production and respiration of temperate (Helgoland, North Sea) and subtidal Arctic (Kongsfjorden, Svalbard) microphytobenthic communities during summer. The diatom communities were generally characterized as cosmopolitan, displayed no site specificity, and had similar chl a and fucoxanthin concentrations. Their net and gross photosynthesis rates and light adaptation intensities, derived from laboratory microsensor measurements, were also similar, despite differences in water temperature. Daily oxygen fluxes across the sediment- water interface were estimated by combining laboratory microprofile and planar optode measurements with in situ data on oxygen penetration and light dynamics. During the study period, the Svalbard sediments were on average net heterotrophic,while the Helgoland sediments were net autotrophic (-22.4 vs. 9.2 mmol O2 m-2 d-1). This was due to high infaunal abundance in the Svalbard sediments that caused high oxygen uptake rates in the sediments and consumption below the sediment euphotic zone. Additionally, bioirrigation of the sediment due to infaunal burrow ventilation was reduced by light; thus, the sedimentary oxygen inventory was reduced with increasing light. Conversely, light-enhanced the oxygen inventory in the Helgoland sediments. Oxygen dynamics in the Svalbard sediments were therefore dominated by bioirrigation, whereas in the Helgoland sediments they were dominated by photosynthetic oxygen production. © Inter-Research 2014.
Authors & Co-Authors
Sevilgen, Duygu Sevgi
Germany, Bremerhaven
Alfred-wegener-institut Helmholtz-zentrum Für Polar- Und Meeresforschung
Germany, Bremen
Max Planck Institute for Marine Microbiology
De-Beer, Dirk
Germany, Bremen
Max Planck Institute for Marine Microbiology
Al-Handal, Adil Yousif
Iraq, Basra
University of Basrah
Brey, Thomas
Germany, Bremerhaven
Alfred-wegener-institut Helmholtz-zentrum Für Polar- Und Meeresforschung
Polerecky, Lubos
Germany, Bremen
Max Planck Institute for Marine Microbiology
Netherlands, Utrecht
Universiteit Utrecht
Statistics
Citations: 21
Authors: 5
Affiliations: 4
Identifiers
Doi:
10.3354/meps10672
Research Areas
Environmental