Variability in the life cycle of Rhizoclonium riparium (Roth) Harv. (Chlorophyceae: Cladophorales) under Dutch estuarine conditions
Nienhuis, P.H. (1974). Variability in the life cycle of Rhizoclonium riparium (Roth) Harv. (Chlorophyceae: Cladophorales) under Dutch estuarine conditions. Hydrobiol. Bull. 8(1-2): 172-178. https://dx.doi.org/10.1007/BF02254917 In: Hydrobiological Bulletin. Netherlands Hydrobiological Society: Amsterdam. ISSN 0165-1404; e-ISSN 2214-708X, more Also appears in:(1974). Proceedings of the International Symposium on Ecology and Physiology of the Brackish Environment, Amsterdam, September 4-7, 1973. Organized by the Netherlands Hydrobiological Society in honour of the Dutch hydrobiologist Dr. H.C. Redeke (1873-1945). Hydrobiological Bulletin, 8(1-2). Netherlands Hydrobiological Society: Amsterdam. 252 pp., more |  |
| Keywords | Cycles > Life cycle
Reproduction
Rhizoclonium riparium (Roth) Harvey, 1849 [WoRMS]
Marine/Coastal; Brackish water |
| Abstract | The reproduction of a considerable number of populations of the green alga R. riparium from hard substrates (wooden poles, dike slopes in the intertidal zone) and soft substrates (tidal marshes and meadows) was studied in unialgal cultures. (2) In the hard substrate habitat the sexual reproduction by gametes and the asexual reproduction by quadriflagellate zoospores are strongly repressed in favour of the asexual reproduction by biflagellate zoospores. (3) In the soft substrate habitat no sexual and hardly any asexual spores are produced; the largest number of samples remain sterile. (4) It is suggested that, running parallel to an increasing instability of the habitat, expressing itself in strong fluctuations in environmental factors, a decreasing capacity of R. riparium to produce spores manifests itself. Reduced salinity, as well as high concentrattions of nitrogen compounds may also repress sexual capacity, as indicated by recent literature. |
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