Polar marine ecosystems are characterized by low water temperatures, sea ice cover, and
extreme annual variation in solar irradiance and primary productivity. A review of the …

Geological records of past sea ice, such as those contained in Arctic marine sediments, offer
an opportunity to strengthen our understanding of long-term sea ice variability, provided …

The present paper begins by reviewing recent developments in our understanding of the
diversity of planktonic microorganisms in the Arctic Ocean, taking into account recent data …

To obtain an accurate picture of microbial processes is essential for in-depth understanding
of the dynamics of microbial communities and metabolic potentials. In this study, an …

The presence of the sea ice biomarker IP25 in Arctic marine sediments has previously been
used as a proxy measure of past sea ice conditions in the Arctic. Although the sea ice diatom …

Deep-sea water columns are enriched with SAR202 that may conduct detrital matter
degradation. There are several subclusters in SAR202, but their subtle differences in …

The maximal value of the chlorophyll-specific carbon fixation rate in the water column or the
optimal assimilation number (Pbopt) is an important parameter used to estimate water …

Marine bacteria play indispensable roles in the phosphorus (P) cycle, primarily responsible
for P assimilation and remineralization. The aim of this study was to determine diversity of …

This thesis investigates the structure and function of planktonic food webs at two sites
between Greenland and the Svalbard Archipelago, covering a coastal ecosystem influenced …

Abstract Picoeukaryotes (< 2–3 µm) are major oceanic primary producers and play a crucial
role for the functioning of marine ecosystems. However, the community structure of such …