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Marine Ecology Progress Series

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MEPS 504:27-42 (2014)  -  DOI:

Oxygen budgets in subtidal arctic (Kongsfjorden, Svalbard) and temperate (Helgoland, North Sea) microphytobenthic communities

D. S. Sevilgen1,2,4,*, D. de Beer2, A. Y. Al-Handal3, T. Brey1, L. Polerecky2,5

1Alfred-Wegener-Institut, PO Box 120161, 27515 Bremerhaven, Germany
2Max Planck Institute for Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany
3Marine Science Centre, Dept. of Marine Biology, University of Basra, Iraq
4Present address: Alfred-Wegener-Institut, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26,
27568 Bremerhaven, Germany
5Present address: Faculty of Geosciences, Utrecht University, Budapestlaan 4, 3584 CD, Utrecht, The Netherlands
*Corresponding author:

ABSTRACT: 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.

KEY WORDS: Benthic primary production · Sandy sediments · Microsensors · Planar optodes · Photosynthesis · Respiration · P-I curve · Bioirrigation

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Cite this article as: Sevilgen DS, de Beer D, Al-Handal AY, Brey T, Polerecky L (2014) Oxygen budgets in subtidal arctic (Kongsfjorden, Svalbard) and temperate (Helgoland, North Sea) microphytobenthic communities. Mar Ecol Prog Ser 504:27-42.

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