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• W2274226966 abstract "With the onset of winter, polar marine microalgae face total darkness for aperiod of up to 6 months. A natural autumn community of Arctic sea ice microalgae was collected for dark survival experiments from the Greenland Sea during the ARK-XI/2 expedition of RV Polarstern in Oetober 1995. After a dark period of 161 days, species dominance in the algal assemblage changed from initially pennate diatoms to small phytoflagellates «20 um), Over the entire dark period. the mean algal growth rate was -0.01 day'. Nearly all diatom speeies had negative growth rares, while phytoflagellate abundance increased. Resting spore formation during the dark period was observed in less than 4.5 % of all cells and only for dinoflagellates and the diatom Chaetoceros spp. We assume that facultative heterotrophy and energy storage are the main processes enabling survival during the dark Arctic winter. After an inerease in light intensity, algal eells reacted with fast growth within days. Phytoflagellates had the highest growth rate, followed by Nitt.schia (rigida. Further investigations and experiments should focus on the meehanisms of dark survival (mixotrophy and energy storage) of polar marine microalgae. Zusammenfassung: Mit Beginn des Winters sind polare Mikroalgen einer Dunkelperiode von bis zu sechs Monaten ausgesetzt. Experimente zur Uber­ lebensstrategie arktischer Eisalgen wurden im Rahmen der Polarstern-Expedi­ tion ARK-XI/2 im Oktober 1995 durchgefuhrt. Die haufigsten Algen zu Beginn des Experiments waren pennate Diatomeen. Nach der Dunkelperiode von 161 Tagen wurde die Algengemeinschaft von Phytoflagellaten <20 um dominiert, die durchschnittliche Wachstumsrate der Algen betrug -0.006 Tag:'. Wahrend die meisten Diatomeenarten stark in ihren Haufigkeiten abnahmen, stieg die der Flagellaten teilweise sogar an. Die Bildung von Dauersporen wurde nur fur max. 4,5 % aller Zellen und nur bei Chaetoceros spp. und Dinoflagellaten beobach­ tet. Vermutlich bilden fakultative Heterotrophie zusammen mit der Nutzung gespeicherter Energie die Hauptprozesse zum Uberleben des arktischen Win­ ters. Auf Erhohung der Lichtintensitat reagierten die Algen mit schnellem Wachstum innerhalb weniger Tage, wobei Phytoflagellaten die hochsten Wachs­ tumsraten aufwiesen, gefolgt von Nitzschia (rigida. Zukunftige Studien und Experimente sollten sich speziell mit den Mechanismen der Dunkelanpassung polarer Algcn (Mixotrophic, Energicspeicherung) befassen." @default.
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• W2274226966 date "1998-01-01" @default.
• W2274226966 modified "2023-09-22" @default.
• W2274226966 title "Dark Survival of Marine Microalgae in the High Arctic (Greenland Sea)" @default.
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