Fig. 1.

Sampling range (A) and population characteristics (B–H) of the comb jelly M. leidyi including native (USA: Miami, red; Woods Hole [WH], green) and invasive (western Eurasia: North Sea, Sylt, purple; Black Sea, Varna, orange; Western Mediterranean, Villefranche, blue) populations with (B) neighbor-joining dendrogram (yellow triangle nodes indicate >95% bootstrap support), principal coordinate analyses (C–E) for invasive and native populations (C), split into northern native (blue) and invasive (purple) (D), southern native (red) and invasive (green and orange) (E) populations and results of admixture analyses (F–H) with most likely scenario of two clusters (F) and alternative scenarios with k = 3 (G) and k = 4 (H).