Publication Cover
SIL Proceedings, 1922-2010
Internationale Vereinigung für Theoretische und Angewandte Limnologie: Verhandlungen
Volume 18, 1973 - Issue 3
1
Views
2
CrossRef citations to date
0
Altmetric
X. Ecology of Freshwater Organisms. 2. Algae and Other Aquatic Plants

Effect of combined action of light and silicon depletion on Asterionella formosa Hass

With 6 figures and 2 tables in the text

Pages 1367-1374 | Published online: 01 Dec 2017
 

Summary

Silicon depletion in fresh waters is of ecological interest because it is recognized as a factor determining the close of spring maxima of diatoms. To study the lethal effect of light at silicon depletion, cultures of Asterionella grown at about 3 klx and alternate light and dark periods of 12 hours were used. It is found, by sampling after the dark periods, that the start of the Si-depleted phase is revealed not only by the end of cell increases, but also by an enhanced ratio caroteneïds: chlorophyll a. The relatively short stationary phase, characterized by more or less constant cell numbers, is followed by a phase in which the number of “living” cells decreases, pigment is broken down and “silicon” is detectable in the medium in increasing amounts. Besides, there is evidence that Asterionella cells of Si-depleted cultures have a faster rate of sinking than cells grown at sufficient Si-concentration.

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.