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SOME DIURNAL FEATURES OF A NERITIC SURFACE PLANKTON POPULATION 1
Author(s) -
Newhouse Jan,
Doty Maxwell S.,
Tsuda Roy T.
Publication year - 1967
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.1967.12.2.0207
Subject(s) - morning , standing crop , photosynthesis , plankton , environmental science , diurnal cycle , diurnal temperature variation , zoology , productivity , circadian rhythm , biology , horticulture , agronomy , atmospheric sciences , botany , geology , ecology , biomass (ecology) , macroeconomics , neuroscience , economics
Four modifications of a 1 4 C method for determining primary productivity were used with surface water samples. An integration of separate results from subsamples that were given either immediate or delayed incubation for 2 or 24 hr gave evidence of two diurnal rhythms. 1. Photosynthetic standing crop was at a maximum at 1600 hours and decreased rather steadily to a minimum around 0600–0800 hours. This rhythm did not seem to relate to a bleaching of chlorophyll during periods of high light intensity or to an early morning cell division period. 2. The fixation per unit of this photosynthetic standing crop reached maxima at both 1000 and 1400 hours, with a rapid decrease to a minimum around 1800–2000 hours.