Morphological variation of Stephanodiscus niagarae Ehrenb. (Bacillariophyta) in a Lake Ontario sediment core
作者： EugeneF. Stoermer , Gail Emmert , ClaireL. Schelske
DOI: 10.1007/BF00202048
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摘要: Stephanodiscus niagarae populations in a core from Lake Ontario show systematic variation radial puncta number and mean valve diameter. Puncta is stable specimens samples deposited between 1720 1844. gradually increases 1860 1947, then rapidly to high numbers after 1964. Mean diameter relatively 1959. Diameter of during this period fluctuates around 63.2 #m. 1959 1980 only 42.5 We conclude that the trend reflects time course eutrophication Ontario. interpret precipitous decline as an indication conditions .in lake late 1950's did not permit sexual reproduction species.
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