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Diel cycles in microbial manganese oxidation and manganese redox speciation in coastal waters of the Bahama Islands
Author(s) -
Sunda William G.,
Huntsman Susan A.
Publication year - 1990
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.1990.35.2.0325
Subject(s) - diel vertical migration , manganese , environmental chemistry , particulates , redox , genetic algorithm , chemistry , bloom , photoinhibition , oceanography , photosynthesis , geology , inorganic chemistry , ecology , biology , photosystem ii , biochemistry , organic chemistry
We observed pronounced diel cycles in formation rates of particulate Mn in coastal waters of the Bahama Islands. Specific rates during the day were 1/20th–1/70th of maximum nighttime rates and there was an associated 3–5‐fold decrease in the ratio of particulate to dissolved Mn during the day. The strong suppression of rates after sunrise probably results from photoinhibition of microbially catalyzed Mn(II) oxidation. The decrease in Mn(II) oxidation during the day along with photodissolution of Mn oxides observed in previous investigations appear to contribute to the increased ratio of dissolved Mn to particulate Mn oxides during daylight.