Light-dependent phagotrophy in the freshwater mixotrophic chrysophyte Dinobryon cylindricum
19 pages, 6 figures, 3 tables
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1993-01
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dig-icm-es-10261-2831242022-11-17T11:36:24Z Light-dependent phagotrophy in the freshwater mixotrophic chrysophyte Dinobryon cylindricum Caron, David A. Sanders, Robert W. Lim, Ee Lin Marrasé, Cèlia Amaral, Linda A. Whitney, Sheri Aoki, Rika B. Porters, Karen G. 19 pages, 6 figures, 3 tables The mixotrophic (bacterivorous), freshwater chrysophyte Dinobryon cylindricum was cultured under a variety of light regimes and in bacterized and axenic cultures to investigate the role of phototrophy and phagotrophy for the growth of this alga. D. cylindricum was found to be an obligate phototroph. The alga was unable to survive in continuous darkness even when cultures were supplemented with high concentrations of bacteria, and bacterivory ceased in cultures placed in the dark for a period longer than one day. Axenic growth of the alga was poor even in an optimal light regime. Live bacteria were required for sustained, vigorous growth of the alga in the light. Carbon (C), nitrogen (N), and phosphorus (P) budgets determined for the alga during growth in bacterized cultures indicated that bacterial biomass ingested by the alga may have contributed up to 25% of the organic carbon budget of the alga. Photosynthesis was the source of most (≥75%) of the organic carbon of the alga. D. cylindricum populations survived but did not grow when cultured in a continuous low light intensity (30 μE m-2 sec-1), or in a light intensity of 150 μE m-2 sec-1 for only two hours each day. Net efficiency of incorporation of bacterial C, N, and P into algal biomass under these two conditions was zero (i.e., no net algal population growth). We conclude that the primary function of bacterivorous behavior in D. cylindricum may be to provide essential growth factor(s) or major nutrients for photosynthetic growth, or to allow for the survival of individuals during periods of very low light intensity or short photoperiod. © 1993 Springer-Verlag New York Inc 2022-11-17T11:30:03Z 2022-11-17T11:30:03Z 1993-01 2022-11-17T11:30:04Z artículo issn: 0095-3628 e-issn: 1432-184X Microbial Ecology 25: 93-111 (1993) http://hdl.handle.net/10261/283124 10.1007/BF00182132 https://doi.org/10.1007/BF00182132 Sí none Springer |
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| description |
19 pages, 6 figures, 3 tables |
| format |
artículo |
| author |
Caron, David A. Sanders, Robert W. Lim, Ee Lin Marrasé, Cèlia Amaral, Linda A. Whitney, Sheri Aoki, Rika B. Porters, Karen G. |
| spellingShingle |
Caron, David A. Sanders, Robert W. Lim, Ee Lin Marrasé, Cèlia Amaral, Linda A. Whitney, Sheri Aoki, Rika B. Porters, Karen G. Light-dependent phagotrophy in the freshwater mixotrophic chrysophyte Dinobryon cylindricum |
| author_facet |
Caron, David A. Sanders, Robert W. Lim, Ee Lin Marrasé, Cèlia Amaral, Linda A. Whitney, Sheri Aoki, Rika B. Porters, Karen G. |
| author_sort |
Caron, David A. |
| title |
Light-dependent phagotrophy in the freshwater mixotrophic chrysophyte Dinobryon cylindricum |
| title_short |
Light-dependent phagotrophy in the freshwater mixotrophic chrysophyte Dinobryon cylindricum |
| title_full |
Light-dependent phagotrophy in the freshwater mixotrophic chrysophyte Dinobryon cylindricum |
| title_fullStr |
Light-dependent phagotrophy in the freshwater mixotrophic chrysophyte Dinobryon cylindricum |
| title_full_unstemmed |
Light-dependent phagotrophy in the freshwater mixotrophic chrysophyte Dinobryon cylindricum |
| title_sort |
light-dependent phagotrophy in the freshwater mixotrophic chrysophyte dinobryon cylindricum |
| publisher |
Springer |
| publishDate |
1993-01 |
| url |
http://hdl.handle.net/10261/283124 |
| work_keys_str_mv |
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