Phenology of Hypnea musciformis (Wulfen) Lamouroux (Rhodophyta, Gigartinales) in Three Populations from Rio de Janeiro State, Brazil
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Abstract
The reproductive phenology of Hypnea musciformis (Wulfen) Lamouroux was analyzed, over a period of two years, in two subtidal epiphytic populations located in Sepetiba Bay and another intertidal epilithic population on a shore exposed to the open sea. All sites are located in Rio de Janeiro State. These investigations suggest that in this species asexual reproduction predominates over sexual reproduction. There are more vegetative than reproductive thalli under environmentally stressful conditions for growth. Cystocarpic plants were only collected from the intertidal epilithic population and always only represented by a low proportion of biomass whereas male plants were not found. The rarity of gametophytes can probably be explained by the replacement of sexual reproduction by asexual reproduction via apomixis or vegetative reproduction.
Copyright (c)2000 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Effect of Temperature and Irradiance on the Release, Attachment and Survival of Spores of Gracilaria pacifica Abbott (Rhodophyta)
- Ultrastructure of Asci and Ascospore Appendages in Linocarpon appendiculatum and L. nipae
- Mass Development of Marine Benthic Sarcinochrysidales (Chrysophyceae s.l.) in Corsica
- Multiple Antimicrobial Activities of the Marine Alga Spyridia filamentosa (Ceramiaceae, Rhodophyta)
- New 13C NMR Methods for Determining the Structure of Algal Polysaccharides. Part 1. The Effect of Substitution on the Chemical Shifts of Simple Diad Galactans
- New 13C NMR Methods for Determining the Structure of Algal Polysaccharides. Part 2. Galactans Consisting of Mixed Diads
- New 13C NMR Methods for Determining the Structure of Algal Polysaccharides. Part 3. The Structure of the Polysaccharide from Cladhymenia oblongifolia
- Restoration Techniques for Macrocystis pyrifera (Phaeophyceae) Populations at the Southern Limit of Their Distribution in México
- Manipulation of Galactan Biosynthesis in Gracilaria chilensis Bird, McLachlan et Oliveira by Light Deprivation
- A Detailed Morphological Study of the Type Species of Osmundea (Rhodomelaceae, Rhodophyta)
- Phenology of Hypnea musciformis (Wulfen) Lamouroux (Rhodophyta, Gigartinales) in Three Populations from Rio de Janeiro State, Brazil
