Physiological ecology of a metalimnetic Cryptomonas population: relationships to light, sulfide and nutrients
- Gasol, Josep M.
- García-Cantizano, Josefina
- Massana, Ramon
- Guerrero, Ricardo
- Pedrós-Alió, Carlos
DOIAbstract
21 pages, 8 figures, 2 tablesThe possible mechanisms by which Cryptomonas phaseolus maintains a large metalimnetic population during stratification were studied in Lake Cisó. The population was shown to always remain at the oxygen-sulfide interface despite the fact that sometimes the amount of light reaching was <1% of incident light. This meant that the amount of light reaching the peak was sometimes much lower than the optimum light intensity for photosynthesis of the population, which was ∼150 μE m-2 s-1. Sulfide inhibited carbon fixation by Cryptomonas, but, not other metabolic processes, because the cells metabolized accumulated carbohydrate during the night while in sulfiderich waters. Cryptomonas phaseolus was shown to be phosphorus ...
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