Fig. 4

Phylogenic tree based on cox1 gene sequences of E. gymnocyprii using the Neighbor-Joining (NJ) method. Bootstrap support is shown above the nodes. The scale-bar indicates genetic distance. Branch labels of different colors indicate different sources of E. gymnocyprii populations in this study (blue, Maduo County (MD); red, Dari County (DR); purple, Qinghai Lake (QHL); green, Zhiduo County (ZD)). Acanthocephalus lucii was used as the outgroup