Abstract
Latitudinal changes in the species richness of planktonic diatoms in Southwestern Atlantic and Antarctic waters (29 degrees-76 degrees S) were analyzed from local to regional scale in three spring and one summer seasons. A total of 220 diatom species (16-87 per station) were recorded. Despite the noticeable interannual variability, species richness showed a maximum in the northern sector of the Brazil-Malvinas Confluence Zone and a highly significant decrease with latitude.
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