Effect of temperature and irradiance on the uptake of ammonium and nitrate by <Emphasis Type="Italic">Laurencia brongniartii</Emphasis> (Rhodophyta,Ceramiales) |
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Authors: | Email author" target="_blank">Gregory?N?NishiharaEmail author Ryuta?Terada Tadahide?Noro |
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Institution: | (1) Education and Research Center for Marine Resources and Environment, Faculty of Fisheries, Kagoshima University, Shimoarata, Kagoshima, Japan;(2) Laboratory of Aquatic Resource Science, Faculty of Fisheries, Kagoshima University, Shimoarata, Kagoshima, Japan |
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Abstract: | The effects of temperature (20, 24 and 28 °C) and irradiance (15 and 40 μmol photon m−2 s−1) on the nitrate and ammonium uptake rates of the subtropical red alga, Laurencia brongniartii, were investigated to prepare for tank cultivation. Nitrate uptake followed saturation kinetics and was faster at higher
irradiances and temperatures. In contrast, ammonium uptake was linear over the experimental range and was not affected by
an increase in temperature. A parameter, β, was calculated to compare substrate uptake rates of nitrate along the linear portion
of the uptake curve with that of ammonium. For nitrate, β was lower at low irradiance and higher at high irradiance (β = 0.007
± 0.003 and 0.030 ± 0.002 μmol N L−1 (μmol N gww−1 d−)−1], respectively). However, β was 0.023 ± 0.002 and 0.034 ± 0.002 μmol N L−1 (μmol N gww−1 d−1)−1] for ammonium, suggesting a preference for ammonium over nitrate. |
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Keywords: | ammonium irradiance kinetics Laurencia brongniartii nitrate temperature |
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