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Osmotic and ionic requirements of the marine centric diatomCyclotella nana
Osmotische und ionische Ansprüche der marinen, zentrischen DiatomeeCyclotella nana
Helgoländer wissenschaftliche Meeresuntersuchungen volume 20, pages 104–110 (1970)
Kurzfassung
Die osmotischen und ionischen Ansprüche der DiatomeeCyclotella nana Hustedt (Klon 13-1) wurden untersucht. Osmotische Reaktionen wurden bei relativ hohem osmotischem Druck nachgewiesen.C. nana vermehrt sich in Salinitäten von 15 bis 50 ‰. Wird der osmotische Druck des Mediums mit Saccharose ausgeglichen, so konnte eine Verdünnung bis zu einem Anteil von 1/6 Seewasser erfolgen, ohne die Vermehrungsvorgänge der Diatomee nachhaltig zu beeinträchtigen. Der Bedarf an Na, K, Ca und Mg sowie die Wirkungen von Konzentrationsveränderungen dieser Kationen werden erörtert.
Summary
1.Cyclotella nana Hustedt (clone 13-1) was found to grow in sea water at salinities ranging from about 15 to 50 parts per thousand.
2. Investigation of the osmotic requirement in the region of poor growth at the lower salinities, revealed that this alga gives an osmotic response at a relatively high osmotic pressure.
3. The osmotic and ionic requirements can be clearly distinguished and it was shown that this oceanic diatom can survive at sea water dilutions as low as 1/6 of full strength of water from the Sargasso Sea when the osmotic pressure is adjusted with sucrose.
4. The requirements of the four main cations (Na, K, Ca, Mg) are discussed.
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Contribution No. 2387 from the Woods Hole Oceanographic Institution. This study was supported in part by National Science Grant GB 7682.
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Guillard, R.R.L., Myklestad, S. Osmotic and ionic requirements of the marine centric diatomCyclotella nana . Helgolander Wiss. Meeresunters 20, 104–110 (1970). https://doi.org/10.1007/BF01609892
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DOI: https://doi.org/10.1007/BF01609892