Seasonal and diet changes in ultrastructure in the dinoflagellate Ceratium hirundinella |
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| Authors: | Chapman Deborah V; Dodge J D; Heaney S I |
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| Institution: | Department of Botany, Royal Holloway College Egham, Surrey, UK
1Department of Zoology, University College London Gower Street, London WCIE 6BT, UK
2Freshwater Biological Association, The Ferry House Ambleside, Cumbria, UK |
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| Abstract: | The ultrastructure of the dinoflagellate Ceratium hirundinella(O.F.Mull.) Bergh. was studied in the plankton of a small productivelake throughout one season of its growth and during one 24-hperiod of that season. The results were related to measuredenvironmental variables. Samples for the seasonal study weretaken every 4 weeks and fixed immediately upon removal fromthe lake and samples for the diel study were fixed in situ atdepth. There was little difference in general ultra-structureof cells during the diel study or during the period of rapidgrowth but greater changes were apparent following excystmentand prior to encystment. Most changes were observed within thechloroplasts, pyrenoids and storage products. Changes in chloroplaststructure were shown to be related to the light conditions beingexperienced by the cells. Starch and lipid occurred in varyingproportions depending on the stage of the life cycle. Starchand associated pyrenoid clusters varied with irradiance levelover the 24-h period. |
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