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A re‐valuation of the Araphidineae/Centrales index as an indicator of lake trophic status
Author(s) -
BRUGAM RICHARD B.
Publication year - 1979
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.1365-2427.1979.tb01529.x
Subject(s) - diatom , trophic state index , trophic level , alkalinity , sediment , ecology , lake ecosystem , environmental science , phosphorus , water quality , phytoplankton , oceanography , habitat , geology , biology , nutrient , chemistry , geomorphology , organic chemistry
SUMMARY. Comparisons of pre‐ and post‐settlement diatom assemblages from the sediment of twenty‐five Minnesota lakes reveals that Stephanodiscus hantzschii percentages are more consistent indicators of human disturbance than the Araphidineae/Centrales (A/C) index. In a set of eighty surface sediment samples from lakes whose water chemistry is known, S. hantzschii , a centric diatom, is abundant as a microfossil in lakes with total phosphorus > 15 μg I −1 and alkalinity > 1.5 m‐equiv. I −1 . High Araphidineae/Centrales indices are characteristic of lakes with only moderate total phosphorus levels and very low alkalinities.