Contenido: Response of epilithic diaton assemblages to water pollution in vivers in the Tokyo Metropolitan area Japan.--The use of scanning electron microscopy diatom examination for ecological studies.--Shannon's diversity index applied to some freshwater diatom assemblages in the Sakawa iver System (Kanagawa Pref.,Japan)and its use as an indicator of water quality.--Approaches for evaluation of river water pollution using epilithic diaton assemblages.--Pollution tolerante diatoms from lotic systems in the Jacuí Basin, Río Grande do Sul, Brazil.
Ingeniería ambiental Contaminación de ríos Diatomos índice de shannon Microscopia-ecología Río Sakawa