Figure 4.

Relationship between carapace length and fecundity (egg number) of coexisting species and hybrids of the D. longispina complex in the Vranov Reservoir along its longitudinal gradient ((a) upstream, (b) middle and (c) dam: (i) 2004 and (ii) 2005). Taxa for which at least five individuals were genetically identified in the respective sample are included; data from both seasons are compared. Symbols, mean values (up triangle, D. cucullata; down triangle, D. galeata×cucullata; circle, D. galeata; hexagon, D. galeata×longispina; square, D. longispina); solid black lines, interquartile ranges; grey dotted lines, minimal and maximal values. Note that the y-axis for the dam samples differs from the rest.