Morphology and phylogenetic relationships of some psychrophilic polar diatoms

Nine psychrophilic polar diatom species within six genera (Chaetoceros, Fragilaria, Navicula, Nitzschia, Porosira, and Stellarima) were found near King Sejong Station, Maxwell Bay, King George Island, Antarctica and near Dasan Station, Ny-Ã…lesund, Svalbard, in the Arctic, in November 1998 and January 2005, respectively. We attempted to access the diversity of psychrophilic polar diatoms cultivated in the culture room of the Korea Polar Research Institute (KOPRI) Culture Collections for Polar Microorganisms (KCCPM) and to establish the phylogenetic relationships among diverse diatoms based on morphological and molecular data.