The Evolution od Diploid-polyploid Complex of Gibel Carp (Carassius gibelio): The Role of Parasites and Different Investment in Physiological Traits
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| Year of publication | 2015 |
| Type | Appeared in Conference without Proceedings |
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| Description | Carassius gibelio is a unique fish species in which two kinds of reproduction are known i.e. gynogenesis and gonochoristic reproduction. The former populations of this invasive species entered in the rivers of Czech Republic about 1975 and were composed of triploid females with gynogenetic reproduction. Recently, the coexistence of gynogenetic form (mainly triploid females, but occasionally also triploid males and tetraploid specimens have been identified) and gonochoristic diploid form have been reported. In this study the potential effect of parasitism on the evolution of diploid-polyploid complex of C. gibelio was analyzed. In addition, the selected measures of immunity and physiology were analyzed. We hypothesized that some traits in gynogens are weakened in order to compensate the two fold cost of reproduction in sexual form. All specimens were determined using morphological traits and mtDNA (D-loop). The presence and intensity of infection for metazoan parasite species was compared between two different reproductive forms. The parameters of nonadaptive (i.e. respiratory burst, lysozym activity and complement activity) and adaptive immunity (IgM antibodies) were compared between two forms in three consecutive years. A weak difference in parasite load was found between two reproductive forms. This study showed that the basic physiological parameters were primarely affected by sex and were not affected by reproductive form. Blood innate immunity of gibel carp was not affected by reproductive form. However, trend of higher IgM in gynogenetic females when compared to sexual diploids was found. This study will be funded by the Czech Science Foundation, Project No. P505/12/0375. |
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