Sargassum filipendula and S. pteropleuron, two species of the brown algal genus common to the west coast of Florida, were studied over an 18-month period. A population of each species became 100% reproductive by late October in both years and new growth from the perennial
bases occurred by the end of March. Mature plants, measuring 1 to 1.5 m in length, were present by the end of June. Ash content was highest in older dying plants and new growth. Protein levels were highest in young growing plants. Soluble carbohydrate was highest in mature plants found during
the summer and early fall months. Lipid levels were low and did not show seasonal patterns. Kilojoules were uniform for both species throughout the year. The compensation-photon flux density was less than 100 μE m−2 s−1 and light saturation was less
than 1,000 μE−2 s−1 for both species. Both species showed broad tolerances to 12 combinations of temperature and salinity in factorial experiments. Low photosynthetic responses occurred after the two species reached maturity in the summer and initiated
reproduction in the fall.
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