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Effect of temperature on nitrite excretion by three marine diatoms during nitrate uptake

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Abstract

Nitrite excretion during nitrate uptake by three nitrate-limited diatoms was measured at different temperatures. Phaeodactylum tricornutum Bohlin and Chaetoceros affinis Lauder Hustedt excreted nitrite over the whole range of physiological temperatures, whereas Thalassiosira pseudonana Hasle and Heimdal (Clone 13-1) excreted nitrite only at 25°C. Parallel to growth and nitrate-uptake rates, excretion rates increased exponentially with temperature, attaining a maximum between 20° and 25°C (optimum temperature range). At the end of nitrate uptake, when the nitrate concentration in the culture medium had decreased below 1 μM, nitrite was reabsorbed at all temperatures, except when cells were in the dark or at very low light intensity. Nitrite uptake was also inhibited by the presence of nitrate in the medium. These results are discussed in relation to the formation and position of the maximum layer of primary nitrite in the thermocline, below the maximum layer of chlorophyll in stratified oceanic areas.

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Communicated by J. M. Pérès, Marseille

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Raimbault, P. Effect of temperature on nitrite excretion by three marine diatoms during nitrate uptake. Marine Biology 92, 149–155 (1986). https://doi.org/10.1007/BF00392831

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