Patterns of parasite distribution in the hybrids of non-congeneric cyprinid fish species: is asymmetry in parasite infection the result of limited coadaptation?

Distribution of host-specific parasites in hybrids of phylogenetically related fish: the effects of genotype frequency and maternal ancestry?

“…Wolinska et al [9], in their dynamic scenario, hypothesized that hybrid genomes are more parasitized than parental genomes under the condition of the high frequency of hybrids. In addition, it seems that the maternal ancestry of hybrids may also influence the infection level of some parasite species, as was shown for digenean and crustacean species in F1 hybrids of the evolutionarily divergent, and morphologically and ecologically different cyprinid species, the common bream (Abramis brama) and roach (Rutilus rutilus) [7].…”

“…The level of parasite infection is regulated by a co-adapted genetic system, which was originally suggested to explain the pattern of parasite distribution in two species of house mice (Mus musculus and M. domesticus) and their natural hybrids [4,5]. Host-parasite genetic co-adaptation is more pronounced in host-specific parasites, thus limiting their infection in hybrid genomes [6,7]. However, several scenarios of parasite infection in hybridizing hosts were proposed to explain the distribution of parasites among hybrids and their parental taxa [8,9].…”

“…Generally, the presence of F1 hybrids is documented in many wild-living cyprinids even when the frequency of hybrids is rather low [6,[16][17][18][19][20][21][22]. Cyprinid hybrids exhibit high larval resistance to environmental disturbances (osmotic and thermal conditions), wider ecological plasticity, greater fasting abilities in comparison to their parents, and limited susceptibility to parasite infection [7,[23][24][25].…”

“…Interestingly, an asymmetrical distribution of parental species-specific parasites (especially specific monogeneans representing gill ectoparasites) was found in hybrids of A. brama and R. rutilus. This may indicate the limited inheritance of defense mechanisms from one parental species and suggests different degrees of host-parasite coadaptation between different host-specific parasites and their associated hosts [7,19].…”

Introgressive hybridization between wild and domestic individuals and its relationship with parasitism in brook charrSalvelinus fontinalis

“…Yet, despite the importance of parasitism in the dynamics and viability of populations, the effects of stocking on parasite communities have rarely been monitored in supplemented populations and the relationship between parasitism and genetic introgression has received very little attention in the literature. Previous studies conducted at the interspecific level showed equivocal results, with hybrid fish displaying either a poorer (Dupont & Crivelli, ), intermediate (Bakke et al ., ; Kalbe & Kurtz, ; Le Brun et al ., ) or better (Krasnovyd et al ., ; Šimková et al ., , ) resistance to parasites than the parental strains. At the intraspecific level, some studies aimed at understanding how hybridization between host strains belonging to different geographic areas shapes parasitism ( e.g ., Kalbe et al ., ; Kalbe & Kurtz, ) and others showed that domestication could negatively affect the parasite resistance of farmed fish (Consuegra & de Leaniz, ; van Oosterhout et al ., ), yet only a few investigated the effects of genetic introgression of domestic genes on parasitism.…”