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Nitrogen fixation (acetylene reduction) by phytoplankton in Green Bay, Lake Michigan, in relation to nutrient concentrations 1
Author(s) -
Vanderhoef Larry N.,
Huang ChiYing,
Musil Robert,
Williams Jeffery
Publication year - 1974
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1974.19.1.0119
Subject(s) - aphanizomenon , bay , nutrient , nitrogen fixation , phytoplankton , nitrogen , nitrate , algae , standing crop , environmental chemistry , phosphate , environmental science , chemistry , agronomy , botany , zoology , cyanobacteria , biology , oceanography , ecology , biomass (ecology) , geology , anabaena , bacteria , genetics , organic chemistry
Nitrogen fixation (acetylene reduction) and the growth of blue‐green algae were studied in Green Bay (Lake Michigan) during summer 1972. Where concentrations of all nutrients were high Microcystis predominated. As combined nitrogen concentrations decreased Aphanizomenon increased. Aphanizomenon showed increasing C 2 H 2 ‐reducing efficiency as the NH 4 + + NO 3 − concentration declined, but its standing crop decreased with declining P concentration. At 40 km from the Fox River diatoms were predominant. Increased algal growth and nitrogen fixation in 1972, as compared to 1971, correlated with higher phosphate concentrations. Almost half as much nitrogen was added to the bay by fixation as was delivered by the Fox River during the same period.