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    Nitrogen uptake kinetics of freshly isolated zooxanthellae

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    Indian_J_Mar_Sci_22_83.pdf (671.4Kb)
    Date
    1993
    Author
    Wafar, M.V.M.
    Wafar, S.
    Rajkumar, R.
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    Abstract
    Zooxanthellae freshly isolated from the coral host Pocillopora damicornis exhibited substrate-saturable uptake kinetics for ammonium, nitrate and urea. Maximum uptake velocity for ammonium [10.1 nmol. ( mu chl-a)./1h/1] was greater than that for nitrate [2.8 nmol. ( mu chl-a)./1h/1] and urea [0.37 nmol. ( mu chl-a)./1h/1]. Half-saturation constants for uptake of the three nitrogen compounds were in the range of 10-15 mu mol.l/1. Generally, uptake of any one nitrogen substrate appears to be inhibitEd. by the other 2 substrates when the latter are present in higher concentrations. The observed interactions can be explainEd. by the uncompetitive model. These results are interpreted as indicative of a simultaneous uptake of all 3 nitrogen compounds by the zooxanthellae
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    http://drs.nio.org/drs/handle/2264/2786
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