| VITAMIN ECOLOGY |
| FACTS |
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| • | Most eukaryotes (especially diatoms) are vitamin |
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| (especially B1, B12) auxotrophs |
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| • | Most prokaryotes (especially heterotrophic |
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| bacteria) can synthesize their own vitamins and |
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| then some |
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| • | Vitamins (especially B1 and B12)
are present in |
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| limiting concentrations in subtropical and |
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| Southern Ocean habitats |
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