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Pelagic plant life draws its principal supply of dissolved or undissolved nitrogen either from the coasts or from localities where warm and cold currents meet." J. Hjort "Where cold and warm currents meet at the surface of the ocean there is a rise of temperature for the animals of the cold current and a fall of temperature for the animals of the warm current, which results in a plentiful destruction of organisms.
Olson et al. (Sat,) studied this question.