Strong Seasonality of Marine Microbial Eukaryotes in a High-Arctic Fjord (Isfjorden, in West Spitsbergen, Norway).

摘要: The Adventfjorden time series station (IsA) in Isfjorden, West Spitsbergen, Norway, was sampled frequently from December 2011 to 2012. community composition of microbial eukaryotes (size, 0.45 10 μm) a depth 25 m determined using 454 sequencing the 18S V4 region amplified both DNA and RNA. compositional changes throughout year were assessed relation situ fjord environmental conditions. Size fractionation analyses chlorophyll showed that photosynthetic biomass dominated by small cells (<10 most but larger during spring summer. winter early-spring communities more diverse than summer/autumn communities. Dinophyceae predominant year. Arctic Micromonas ecotype abundant mostly early-bloom fall periods, whereas heterotrophs, such as marine stramenopiles (MASTs), Picozoa, parasitoid alveolates (MALVs), displayed higher relative abundance other seasons. Our results emphasize extreme seasonality eukaryotic driven light regime nutrient availability point necessity thorough knowledge hydrography for full understanding their succession variability.