Phenotype variation among stratigraphic units in the Czech Republic, Slovakia, and Poland. A Mean frequencies of individual morphotypes (series II) and corresponding values of Shannon diversity (H') in stratigraphic units proposed by Nadachowski (1982): own record (dark blue) vs. data from Polish sites (orange). B Shannon diversity index H’ in samples from the Czech Republic (CZ), Slovakia (SK), and Poland (PL). C UPGMA clustering of mean morphotype frequencies in particular stratigraphic units (1 – Holocene; 1B – late glacial; 2 – MIS 2; 3 – MIS 3–4) from Moravia and Bohemia (CZ), Slovakia (SK), and Poland (PL).