A climatic-limnologic model of diatom succession for paleolimnological interpretation of varved sediments at Elk Lake, Minnesota

摘要: Sediment traps placed in the profundal region of Elk Lake, north central Minnesota during 1979 spring and 1983–84 fall seasons monitored seasonal diatom production for two climatically distinctive periods. The was one coldest wettest on record. Ice out at Lake 10 days later than average, circulation short. Fragilaria crotonensis dominated late early summer association with Synedra Cyclotella species, perhaps because rates phosphorus supply were low compared to silica. winter drier usual, but cold 1984 caused ice be about 1 week earlier normal. Spring storms promoted a long full that allowed Stephanodiscus minulutus bloom, presumably response increased loading related deep vigorous circulation. dominant diatoms F. S. minutulus may reflect climatic patterns control lake regulated occurrence these is generally, not specifically, comparable their distribution surface sediments throughout Minnesota. A combination regional lake-specific studies controls succession provides insights interpreting paleolimnogical records diatoms.