Abstract
The marine red alga Stictosiphonia hookeri was isolated from three locations in cold-temperate Chile and Argentina, and the comparative ecophysiology of the isolates was studied. The growth response in relation to various salinity, light and temperature conditions was investigated and photosynthesis-irradiance curves were determined. The effect of increasing salinity on the intracellular concentration of the sugar alcohol sorbitol, and the accumulation/degradation kinetics of this compound, were studied. All isolates are characterized as euryhaline, eurythermal and low-light-adapted organisms because of the growth and photosynthesis response patterns. With increasing salinities the macroalgae accumulated high concentrations of sorbitol, which acts as an organic osmolyte and compatible solute. However, this process requires more than 24 h, and hence is too slow to contribute to osmotic acclimation within a tidal cycle. The geographic distribution and the growth versus temperature data indicate infraspecifi...
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