Evolution of diploid-polyploid Carassius auratus complex
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| Year of publication | 2015 |
| Type | Appeared in Conference without Proceedings |
| MU Faculty or unit | |
| Citation | |
| Description | The presence of diploid and triploid forms of Carassius auratus complex in the Czech Republic is known for over 40 years. This complex consists of gynogenetic triploid females (triploid males are also recorded in very small frequency) and sexually reproducing form including males and females with similar frequencies. In this study, the C. auratus complex was studied from the selected lokality in the connecting channels Lednice-South Moravia situated on the Dyje river. Using molecular analysis of mitochondrial DNA (D-loop region) the collected specimens of the complex were determined as "subspecies" of Carassius auratus, C. gibelio, C. landsdorfi and M-line. The majority of specimen belong to the C. gibelio haplotype. We focused on selected measured of physiology and immunity including the specific immunity (IgM antibodies) and non-specific immunity (i.e. respiratory burst, lysozyme activity and complement activity). We also compared the haematological parameters and the level of parasite infection between two life strategies (sexual diploids versus gynogenetic polyploids) of Carassius auratus complex. Samples were collected in August during three consecutive years. Our analyses revealed no difference in non-specific immunity between two reproductive forms but the difference in IgM production between gynogens and sexuals was found. Concerning the haematological parameters, only erythrocyte count and hematocrit was clearly affected by ploidy status. High investment in the reproduction was found for both gynogenetic and sexual females when compared to sexual males. No obvious difference was found in the abundance of different parasite group between diploid sexuals and triploid gynogens. |
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