The ecology of Sargassum pteropleuron Grunow (Phaeophyceae, Fucales) in the waters off South Florida

Abstract
The seasonal growth (change in length), reproduction, and structure of a dense population of Sargassum pteropleuron Grunow off Key Largo, Florida are described. The maximum mean rate of increase in plant length occurred during the high water temperatures and nutrient concentrations of the summer months. Rapid loss of annual axes occurred with the end of reproduction in the fall. Reproduction occurred concurrently with both a reduction in day length to less than 11 · 5 h and a drop in water temperature. The seasonality of seaweed growth in the subtropics is discussed.

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