In the deep ocean north of Bermuda, during spring and summer, conditions for growth are poor, but physical conditions, such as high salinity and great depth, are favorable to the marine phytoplankton. The dominant species in a sample constitute a modest proportion of the cells counted, and a considerable diversity of species is observed....
Hulburt, Edward M.. 1963. "The diversity of phytoplanktonic populations in oceanic, coastal, and estuarine regions." Journal of Marine Research 21, (2). https://elischolar.library.yale.edu/journal_of_marine_research/996