Research on the coexistence mechanism of the sexual-asexual form of Carassius auratus sp.

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I studied the coexistence mechanism of the gynogenetic complex of Carassius auratus, which includes two types: the sexual and gynogenetic asexual form. (1) I rejected three coexistence hypotheses (the epidemic hypothesis, neutral hypothesis and meta-population hypothesis) based on the data of natural populations. (2) I demonstrated the cost of sex in experimental populations: the growth rate of the asexual population was significantly higher than that of the sexual population. (3) I showed the difference in the growth rate between the sexual and asexual forms. In conclusion, the results suggest that the coexistence mechanism depends on some factors related to the different in the birth rate between the two forms.