| Summary: | The aim of the study was to identify composition of Diatomscommunities since the data would have been used in Meso- and Microcosm study tobe carried out on the very same site in the frame of EU project called as OC(Ocean Certain). The samples collected along Kongsfjorden and some glaciallakes in Ny Ålesund, Svalbard in 2015. For an Arctic fjord in 2015, the variations in phytoplanktonabundances showed that t he phytoplankton communitywas mainly dominated by some small single cell Diatoms. The most abundant specieswere of genus Cyclotella, i.e. , C. atomus , C. atomus var. atomus , C.atomus var. marina . Among them, C.ocellata which is a good indicator for the environments where shorter icecovers and longer growing seasons occur. Among pennate species of which belonged to the genera Fragilaria,Navicula, Achnanthes, Cocconeis and Diploneis were also abundant ones. Anotherremarkable finding was for the glacial lakes in which the occurrences ofspecies of several pennate genera such as, Navicula, Fragilaria,Diatoma, Achnanthes, Diploneis and Cymbella. There were also species of Cyclotella, i.e. , C. ocellata and C. antiqua . All those species expectedlycan provide some contribution to the main goal of this workshop which we areable to provide LM and SEM images together with some less abundant anddebatable ones. In Arctic phytoplankton abundance was ranged about100.000-1.500.000 cells/l. Because of their small sizes, it is somewhatdifficult to pronounce a diatom dominancy by considering their contribution tototal phytoplankton abundance. Phytoplanktonic carbon values ranged 7 - 40 C m g/l in theKongensfjorden. Diatom’s contribution ranged around 0,2-0,7 C m g/l while theirmaximum values reached in Glacial Lake; about 100 C m g/l.
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