Abstract
This paper presents results of field and laboratory work on one component of population structure ofIridaea splendens (Setchellet Gardner) Papenfuss (Gigartinaceae, Rhodophyta), the seasonal change in abundance of the gametophyte life-history stage. Investigations of this genus by others (using a variety of sampling and identification techniques) have shown a seasonal gametophyte dominance, sporophyte dominance, or some combination of these two. Gametophyte stages ofIridaea splendens produce kappa carrageenan and tetrasporophyte stages lambda carrageenan; a chemical colorimetric test using resorcinol can be used to identify these stages regardless of the presence of reproductive structures. In this paper we report on the proportion of gametophytes determined both by this chemical test and by the presence of reproductive structures, and on one possible determinant of the seasonal change in dominance. Analysis of field samples using the resorcinol test showed that from June–August the gametophyte stage predominates and from December–February the tetrasporaphyte stage is most common, both in reproductive and non-reproductive thalli (the latter tested as three size classes). Examination of reproductive structures gave similar results. One factor suggested in the literatures as a possible determinant of the haploid/diploid ratio is apomeiosis (in the formation of the tetraspores); our results show this to be unimportant in the Vancouver Harbor populations.
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Presented at the XIIIth International Seaweed Symposium, University of British Columbia, Vancouver, Canada, August 1989.
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De Wreede, R.E., Green, L.G. Patterns of gametophyte dominance ofIridaea splendens(Rhodophyta) in Vancouver Harbour, Vancouver, British Columbia, Canada. J Appl Phycol 2, 27–34 (1990). https://doi.org/10.1007/BF02179766
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DOI: https://doi.org/10.1007/BF02179766