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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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The influence of salinity fluctuation on the ammonium metabolism of the marine diatom Skeletonema costatum grown in continuous culture Rijstenbil, J.W.; Sinke, J.J. (1989). The influence of salinity fluctuation on the ammonium metabolism of the marine diatom Skeletonema costatum grown in continuous culture. J. Plankton Res. 11(2): 297-315. https://dx.doi.org/10.1093/plankt/11.2.297 In: Journal of Plankton Research. Oxford University Press: New York,. ISSN 0142-7873; e-ISSN 1464-3774, meer

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Trefwoorden

Aquaculture systems > Continuous culture Chemical reactions > Photochemical reactions > Photosynthesis Environmental effects > Salinity effects Primary production Properties > Chemical properties > Salinity Skeletonema costatum (Greville) Cleve, 1873 [WoRMS] Marien/Kust

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Rijstenbil, J.W., meer Sinke, J.J.

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Abstract

Ammonium-limited cultures of Skeletonema costatum were grown at dilution rates from 0.019 to 0.038 h-1 at an average salinity of 22.4{per thousand} For a few days cultures were exposed to a freshwater pulse. When salinity was decreased to 8.6{per thousand} (average minimum) photosynthesis and cell division were inhibited. Both in vivo and DCMU-enhanced fluorescence per cell were statistically constant: photosystems I and II were not inhibited by a gradual salinity decrease. Ammonium assimilation was affected via an inhibition of carbon fixation. Ammonium concentrations increased in the continuous cultures, whereas the overcapacity of ammonium uptake declined: the nitrogen limitation was relieved. When salinity was increased again, photosynthesis and cell division were stimulated. Salinity fluctuations were accompanied by a fluctuation in the pools of aspartic acid (0.5-1.0 mM), glutamine acid (0.9-4.1 mM) and glutamine (0.5-2.0 mM). The pool of glutamic acid followed the salinity pattern (r=0.67, P<0.05). The correlation between the amino acid pool and the osmotic value of the medium was significant (r=0.72, P<0.05). Cellular glutamic acid and glutamine levels increased until the nitrogen limitation was restored.

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