Abstract
Biogeographical regions in the pelagial of the ocean can and should be characterized not only by their typical species but also by their production of plankton. The biomass of plankton (weight in mg per 1 m 3) in the boreal region of the North Pacific Ocean is about ten times greater than in its tropical region. Since plankton is the basis of all food-relationships through the whole thickness of the ocean water mass, this will tell also on the abundance of benthos and the character of bottom sediments. The boreal region is richer in benthic life and its sediments contain a greater amount of silica.
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