Long-term trends in lake water pH and metal concentrations inferred from diatoms and chrysophytes in three lakes near Sudbury, Ontario

摘要: Diatom valves and chrysophyte scales were analyzed in sediment cores to assess historical (post-1860) recent (since 1970) trends lake water pH, total [Al], [Ni] Lumsden, George, Acid lakes (Killarney Provincial Park, Ontario). Although acidification Lumsden started the 1930s, rapid only occurred since 1960s. As pH declined, inferred [Al] greatly increased causing extirpation of sport fisheries. In nearby George Lake, 1920s, declined about 0.5 a unit by 1960. The fish community Lake survived where was less severe than lakes. previous paleolimnological studies, chrysophytes generally indicate earlier more marked trajectories when compared with from diatoms, probably because vernal blooming euplanktonic are tracking spring depressions. all three la...