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The A/C (Araphidineae/Centrales) ratio in high and low alkalinity lakes in eastern Minnesota
Author(s) -
BRUGAM RICHARD B.,
PATTERSON† CAROL
Publication year - 1983
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1983.tb00656.x
Subject(s) - fragilaria , eutrophication , alkalinity , diatom , sediment , oceanography , ecology , environmental science , glacial period , paleolimnology , phytoplankton , biology , geology , chemistry , nutrient , paleontology , organic chemistry
SUMMARY. Diatoms from surface sediment samples from lakes on both sides of a glacial drift border in eastern Minnesota show that Araphidinate diatom genera like Fragilaria, Asterionella and Synedra are more common in lakes in drift with lower CaCO 3 whereas Stephanodiscus and Melosira species are more abundant in those with high CaCo 3 . In a lake sediment core from low carbonate drift Fragilaria crotonensis and Asterionella formosa increased when pioneer farmers arrived. These results confirm speculation that high A/C ratios are associated with low‐alkalinity eutrophic lakes.