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- W2068146379 abstract "The red fluorescence of filtered sea water has been measured on 216 samples in the 0–150 m layer of the equatorial Atlantic Ocean. Soluble fluorescence is maximum where chlorophyll a and in vivo fluorescence are maximum, but the percentage of soluble fluorescence, (soluble fluorescence/ in vivo fluorescence) × 100, is minimum at these levels; in recently upwelled waters of the equatorial divergence, the percentage of soluble fluorescence is equal to 10 in the 0–20 m layer and regularly increases to 60 or more at 100–150 m; in the nitrate depleted mixed layer of a convergence it averages 30, decreases to 15 in the thermocline maximum of chlorophyll a , and again reaches 60 in deep waters. A significant positive correlation has been found between the percentage of soluble fluorescence and the amount of phaeophytin, and soluble fluorescence in the open sea is thought to be the result of the degradation and release of chloroplastic products by aged or grazed phytoplankton populations. Low values (< 20) of the percentage soluble fluorescence indicate the presence of healthy phytoplankton cells, whereas high values (> 30) are evidence of unfavourable growth conditions (e.g., limiting nutrients or darkness) or high grazing pressure. The simultaneous measurement of in vivo fluorescence and soluble fluorescence is a method of obtaining valuable information rapidly on the physiological state of the phytoplankton population in the water column." @default.
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- W2068146379 date "1978-05-01" @default.
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- W2068146379 title "The soluble fluorescence in the open sea: Distribution and ecological significance in the equatorial Atlantic Ocean" @default.
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- W2068146379 doi "https://doi.org/10.1016/0022-0981(78)90121-1" @default.
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