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Intraspecific Differences in Nitrate Half‐Saturation Constants for Three Species of Marine Phytoplankton
- Carpenter, Edward J., Guillard, Robert R. L.
- Ecology 1971 v.52 no.1 pp. 183-185
- clones, intraspecific variation, nitrates, nutrient content, pathotypes, phytoplankton
- Half—saturation constants (K) for NO_3 uptake were measured on eight clones, belonging to three species, of marine phytoplankton. The clones isolated from oceanic, low—nutrient areas had K values of below 0.75 (mu)M NO_3, while clones of the same species taken from estuarine regions had higher K values (over 1.5 (mu)M NO_3). Other isolated from shelf areas had intermediate (1.2 (mu)M NO_3) or low (0.1 (mu)M NO_3) K values. These data suggest that physiological races of marine phytoplankton are adapted to high or low nutrient levels.