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The allocation of biomass to receptacle, holdfast and vegetative tissues differed significantly between  Sargassum elegans  and  Sargassum incisifolium , two sympatric dominant species of the upper intertidal at Reunion Rocks, KwaZulu-Natal, South Africa.  Sargassum elegans , a clumped (many axes per holdfast) species with short primary laterals and a prostrate holdfast allocated a greater proportion of its biomass to the holdfast than did  S. incisifolium , an erect species with longer primary laterals, fewer main axes and a conical holdfast. Conversely,  S. incisifolium  allocated more biomass to the production of receptacle tissue than did  S. elegans . These different biomass allocation patterns have previously been considered indicative of different reproductive strategies, i. e. that of sexual reproduction vs. that of persistence and spread in a high wave action environment. At any one time, a low percentage (&lt; 15 %) of the main axes of  S. elegans  thalli were found to be reproductive, whereas a significantly higher percentage (&gt; 50 %) of main axes of  S. incisifolium  were found to be reproductive. Per main axis,  S. elegans  has a greater reproductive effort than  S. incisifolium , however at the thallus level, the opposite was observed. It is suggested that the main axes (modules of the genet) of  S. elegans  function co-operatively to promote sexual reproduction, but minimize any associated costs.

botanica marina

Reproductive Allocation and Strategy of  Sargassum elegans  Suhr and  Sargassum incisifolium  (Turner) C. Agardh from Reunion Rocks, KwaZulu-Natal, South Africa