Autecology, life history and toxicology of the silicoflagellate Dictyocha speculum (Silicoflagellata, Dictyochophyceae)
- 1 January 1993
- journal article
- Published by Taylor & Francis in Phycologia
- Vol. 32 (1) , 29-39
- https://doi.org/10.2216/i0031-8884-32-1-29.1
Abstract
Growth and development of cultured skeleton-bearing and naked stages of the heterokont flagellate Dictyocha speculum Ehrenberg (Silicoflagellata, Dictyochophyceae) were examined. The bloom-forming naked stage is easily cultivated and shows optimum growth at salinities of 15–25%, within a temperature range of 11–15°C. A maximum growth rate of 1 division/24 h was found in cultures. The skeleton-bearing stage is difficult to maintain in culture: growth is slow and dense cultures were never obtained. The salinity optimum of this stage as deduced from field data is somewhat higher than that observed for the naked stage, whereas the temperature requirements are similar. Multinucleate cells occurred in cultures of the naked stage. Cells analogous to the multinucleate cells were derived from the skeleton-bearing cells and subsequently observed to transform into naked cells. The multinucleate cells are possibly resting stages. Measurements of the DNA content of the skeleton-bearing and the naked cells sho...Keywords
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