Development of an Arcellacea (testate lobose amoebae) based transfer function for sedimentary Phosphorus in lakes

► Lake arcellacean (testate lobose amoebae) response to sedimentary phosphorus tested. ► Training set for sedimentary phosphorus developed for southern Ontario. ► Transfer function reconstructed 19th-21st century lake phosphorus loading on test lake. ► Chemical fertilizer use most significant cause of lake eutrophication.