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Keywords:

  • Phenotypic variation;
  • genotypic variation;
  • benthic foraminifera;
  • Reophax;
  • Baltic Sea

A method for identifying ecophenotypic variants is tested, using two morphological variants of the benthic foraminifer Reophax dentaliniformis Brady from the Baltic Sea. Results show that the example does not correspond to the model for ecophenotypic variation. This is interpreted as showing that the two forms are genetically differentiated and that the gene flow between them is restricted by the water circulation pattern in the Baltic.