Physiological ecology of a metalimnetic Cryptomonas population: relationships to light, sulfide and nutrients
21 pages, 8 figures, 2 tables
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Oxford University Press
1993-01
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dig-icm-es-10261-1737792020-12-13T09:07:27Z 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 21 pages, 8 figures, 2 tables The 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 limited at certain times. Phosphorus, however, could not be derived from the hypolimnion. Cryptomonas phaseolus did not ingest bacteria and the amount of carbon fixed, as measured by 14CO2 incorporation, was sufficient to meet all the carbon requirements of the population. Altogether, none of the proposed mechanisms explained the development of the cryptomonad by itself. Cryptomonas phaseolus seemed especially well adapted to the metalimnetic habitat and few other species can compete with it. We hypothesize that predation is also reduced in the surroundings of the anoxic metalimnion. Reduction of these two processes would explain why some algal species can attain high biomasses and persist throughout stratification in the metalimnion of lakes. © 1993 Oxford University Press Peer Reviewed 2019-01-07T10:15:48Z 2019-01-07T10:15:48Z 1993-01 2019-01-07T10:15:48Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1093/plankt/15.3.255 issn: 0142-7873 1464-3774 Journal of Plankton Research 15(3): 255-275 (1993) http://hdl.handle.net/10261/173779 10.1093/plankt/15.3.255 https://doi.org/10.1093/plankt/15.3.255 Sí none Oxford University Press |
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| description |
21 pages, 8 figures, 2 tables |
| format |
artículo |
| author |
Gasol, Josep M. García-Cantizano, Josefina Massana, Ramon Guerrero, Ricardo Pedrós-Alió, Carlos |
| spellingShingle |
Gasol, Josep M. García-Cantizano, Josefina Massana, Ramon Guerrero, Ricardo Pedrós-Alió, Carlos Physiological ecology of a metalimnetic Cryptomonas population: relationships to light, sulfide and nutrients |
| author_facet |
Gasol, Josep M. García-Cantizano, Josefina Massana, Ramon Guerrero, Ricardo Pedrós-Alió, Carlos |
| author_sort |
Gasol, Josep M. |
| title |
Physiological ecology of a metalimnetic Cryptomonas population: relationships to light, sulfide and nutrients |
| title_short |
Physiological ecology of a metalimnetic Cryptomonas population: relationships to light, sulfide and nutrients |
| title_full |
Physiological ecology of a metalimnetic Cryptomonas population: relationships to light, sulfide and nutrients |
| title_fullStr |
Physiological ecology of a metalimnetic Cryptomonas population: relationships to light, sulfide and nutrients |
| title_full_unstemmed |
Physiological ecology of a metalimnetic Cryptomonas population: relationships to light, sulfide and nutrients |
| title_sort |
physiological ecology of a metalimnetic cryptomonas population: relationships to light, sulfide and nutrients |
| publisher |
Oxford University Press |
| publishDate |
1993-01 |
| url |
http://hdl.handle.net/10261/173779 |
| work_keys_str_mv |
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| _version_ |
1777666844828631040 |