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CHEMICAL CHANGES, INCLUDING NITRATE REDUCTION, IN DARWIN BAY, GALAPAGOS ARCHIPELAGO, OVER A 2‐MONTH PERIOD, 1969 1
Author(s) -
Richards F. A.,
Broenkow W. W.
Publication year - 1971
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.1971.16.5.0758
Subject(s) - water column , nitrate , archipelago , bay , oceanography , sediment , environmental science , period (music) , environmental chemistry , chemistry , geology , ecology , biology , paleontology , physics , acoustics
Observations in March and May 1969 in Darwin Bay, Isla Genovesa, Galapagos Islands, show that nitrate reduction occurred in the deeper stagnant water at a minimum rate of about 60 µ g‐atom liter ‒1 yr ‒1 and at the sediment‐water interface at a rate of about 1.3 g‐atom m ‒2 yr ‒1 . Apparently about 50% of the organic material produced in the water column is oxidized by nitrate‐reducing bacteria in the water column below 40 m and in the sediment. At the observed rates, it would require no more than 4 to 6 months to reduce completely the nitrate in the water column at the beginning of nitrate reduction.