| Resumo: |
The research on south-western Atlantic phytoplankton carried out in July-August of 1976 resulted in revealing the predominance of diatoms, dinoflagellates and yellow-green algae. The greatest species diversity is found in the Brazilian waters, maximum quantities and biomass are registered in transformed waters between the subtropical Brazilian and subantarctic Falkland waters and the Western wind-drift current. In the section along 42 grad 30 min S. L. between 52 grad and 59 grad W. L. the trophogenic layer in the Falkland waters as well as in the transformed waters spread down to a depth of about 50 m, in the Brazilian waters - down to 80-100 m. In the 43 grad 30 min W. L. section from 46 grad to 27 grad S. L. the lower limit of the trophogenic layer deepened from 175 m in the waters of the Western wind-drift current to 250 m - in the waters influenced by the Brazilian branch.
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