Publication details
Hostitelsky specifičtí paraziti u mezidruhových hybridů kapra obecného a karase stříbřitého
| Title in English | Host-specific parasites in interspecific hybrids of common carp and gibel carp |
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| Authors | |
| Year of publication | 2024 |
| Type | Conference abstract |
| MU Faculty or unit | |
| Citation | |
| Description | Gibel carp (Carassius gibelio) and common carp (Cyprinus carpio) are common in Czech waters, their hybridization and the emergence of viable F1 hybrids have been confirmed. Both host species harbour host-specific parasites of the taxon Monogenea and at the same time several generalist parasite species of this taxon. From the point of view of host-parasite interactions, interspecific hybridization disrupts the association between a host-specific parasite and its host by changing the genetics of the host. The aim of the work was to study the effect of host hybridization on the presence and abundance of host-specific parasites in the above-mentioned fish species. In September 2021, the parasitological examination of 9 experimental fish lines was carried out: 2 lines of F1 hybrids, 1 line of F2 hybrids, 4 lines of backcrosses and lines of pure species of common carp and gibel carp, which were exposed to experimental parasite infection in natural conditions (breeding pond) for 1 month. The results revealed manifestations of two phenotypes – heterosis in F1 hybrids and partial genetic failure in F2 hybrids. The infection intensities of the backcross hybrids depended on the proportion of the genome of the parental species, which suggests coadaptation of the host-specific parasite and the associated host species. Heterosis (enhancement of the fitness of the offspring compared to the parents) was manifested by a decrease in the abundance of specific parasites in both lines of F1 hybrids (however, the hybrid showed susceptibility to specific parasites of both parental species). In generalist parasites, the relationship between hybridization and infection intensity was not revealed. On the contrary, genetic failure (reduction of the fitness of the offspring compared to the parents) was manifested by a slightly higher infection intensity. |
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