Resting cells of microorganisms in the 20–100 μm fraction of marine sediments in an Antarctic coastal area |
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| Authors: | Mutsuo Ichinomiya Miwa Nakamachi Mitsuo Fukuchi Akira Taniguchi |
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| Institution: | aLaboratory of Aquatic Science and Consultant, Kamiikedai, Tokyo 145-0064, Japan;bTohoku National Fisheries Research Institute, Fisheries Research Agency, Shiogama, Miyagi 985-0001, Japan;cNational Institute of Polar Research, Kaga, Tokyo 173-8515, Japan;dTokyo University of Agriculture, Okhotsk, Abashiri, Hokkaido 099-2493, Japan |
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| Abstract: | We investigated the morphological features, vertical sinking fluxes, and number densities of the resting cells of ice-associated microorganisms in the 20–100 μm fraction of natural marine sediments collected from ice-covered and ice-free areas around Syowa Station, Lützow-Holm Bay, East Antarctica. We identified the resting cells of various taxonomic groups, including the spores of a diatom, cysts of three dinoflagellates, cysts of five oligotrich ciliates, and the eggs of a mesozooplankton. This is the first report of oligotrich ciliate cysts from Antarctic waters. The resting spores of Thalassiosira australis (diatom), cysts of Polarella glacialis (dinoflagellate), and egg type 1 sink to the bottom sediment during summer. Our results suggest that some planktonic and ice-associated microorganisms in Antarctic coastal areas send their resting cells to the bottom sediments as seed populations for the following generation. |
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| Keywords: | Resting spore Resting cyst Microorganisms Antarctica Marine sediment |
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