Diversity, ecology and biogeography of the freshwater diatom communities from Ulu Peninsula (James Ross Island, NE Antarctic Peninsula)

摘要: The diversity, ecology and biogeography of diatoms in lakes, seepage areas streams on the Ulu Peninsula, a large ice-free area northern part James Ross Island (Weddell Sea), were studied. A diverse diatom flora 123 taxa was observed, dominated by several Nitzschia taxa, Psammothidium papilio, Eolimna jamesrossensis, Fragilaria capucina Fistulifera saprophila. results from similarity diversity analysis suggest to be biogeographically positioned within Maritime Antarctic region, yet with some affinities Continental Antarctica, as shown presence Luticola gaussii Achnanthes taylorensis. Based our data, can thus located close boundary two main biogeographical regions. Diatom communities present could clearly distinguished those latter being much more species rich. multivariate analysis, conductivity nutrients selected environmental factors determining composition Peninsula lakes. revised taxonomy induced construction transfer function for water studied lakes that applied further palaeoecological studies.