Microphytobenthos of Arctic Kongsfjorden (Svalbard, Norway): biomass and potential primary production along the shore line |
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Authors: | Jana Woelfel Rhena Schumann Florian Peine Anita Flohr Aleksandra Kruss Jaroslaw Tegowski Philippe Blondel Christian Wiencke Ulf Karsten |
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Institution: | 1. Institute of Biological Sciences, Applied Ecology, University of Rostock, Albert-Einstein-Strasse 3, 18051, Rostock, Germany 2. Institute of Biological Sciences, Marine Biology, University of Rostock, Albert-Einstein-Strasse 3, 18051, Rostock, Germany 3. Center for Marine Tropical Ecology, Fahrenheitstr. 6, 28359, Bremen, Germany 4. Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712, Sopot, Poland 5. Institute of Oceanography, University of Gdańsk, al. Marsza?ka Pilsudskiego 46, 81-378, Gdynia, Poland 6. Department of Physics, University of Bath, Claverton Down, Bath, BA2 7AY, UK 7. Section Functional Ecology, Department Seaweed Biology, Alfred-Wegener-Institute for Polar and Marine Research, Am Handelshafen 12, 27570, Bremerhaven, Germany
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Abstract: | During summer 2007, Arctic microphytobenthic potential primary production was measured at several stations around the coastline
of Kongsfjorden (Svalbard, Norway) at ≤5 m water depth and at two stations at five different water depths (5, 10, 15, 20,
30 m). Oxygen planar optode sensor spots were used ex situ to determine oxygen exchange in the overlying water of intact sediment
cores under controlled light (ca. 100 μmol photons m−2 s−1) and temperature (2–4°C) conditions. Patches of microalgae (mainly diatoms) covering sandy sediments at water depths down
to 30 m showed high biomass of up to 317 mg chl a m−2. In spite of increasing water depth, no significant trend in “photoautotrophic active biomass” (chl a, ratio living/dead cells, cell sizes) and, thus, in primary production was measured at both stations. All sites from ≤5 to
30 m water depth exhibited variable rates of net production from −19 to +40 mg O2 m−2 h−1 (−168 to +360 mg C m−2 day−1) and gross production of about 2–62 mg O2 m−2 h−1 (17–554 mg C m−2 day−1), which is comparable to other polar as well as temperate regions. No relation between photoautotrophic biomass and gross/net
production values was found. Microphytobenthos demonstrated significant rates of primary production that is comparable to
pelagic production of Kongsfjorden and, hence, emphasised the importance as C source for the zoobenthos. |
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