ROLE OF ALUMINUM AND GROWTH RATE ON CHANGES IN CELL SIZE AND SILICA CONTENT OF SILICA‐LIMITED POPULATIONS OF ASTERIONELLA RALFSII VAR. AMERICANA(BACILLARIOPHYCEAE)1

摘要: Changes in cell size and silica content were examined response to aluminum additions cultures of the acidophilic diatom Asterionella ralfsii var. americana Korn at pH 6.0. The effect Al over a range steady-state growth rates using silica-limited semicontinuous (Si:P=8.0). Addittions ≥2.8 μmol.L -1 total decreased mean length, surface area, biovolume up 40-50%. effets dependent on rate with magnitude reduction increasing higher rates. effects proportion small (approximately 15-20 μm) length classes increased relative large 50 μm length) when exceeded 2.8 , particularly (...)