Cytogenetics of diplozoid monogeneans parasitizing fish genus Abramis
| Název česky | Cytogenetika monogeneí taxonu Diplozoidae parazitujících na rybách rodu Abramis |
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| Autoři | |
| Rok publikování | 2009 |
| Druh | Konferenční abstrakty |
| Fakulta / Pracoviště MU | |
| Citace | |
| Popis | Species determination within the family Diplozoidae still remains problematic. Apart from skill demanding morphological discrimination combined with molecular markers, cytogenetic characteristics may represent additional reliable species characteristics. So far, except of few data on karyotypes of monogenean species, no advanced cytogenetic methods have been applied for diplozoids. The present study has revealed new information on chromosome complement of diplozoid parasites, i.e. Paradiplozoon sapae from Abramis sapa, Paradiplozoon nagibinae from Abramis ballerus, Paradiplozoon bliccae from Abramis bjoerkna and Diplozoon paradoxum from Abramis brama, using both classical and modern staining methods. Diploid chromosome complements of P. sapae, P. nagibinae and P. bliccae consisted each of 14 telocentric chromosomes which were (8.8-4.5um), (10.4-5.5um) and (10.3-4.3um) long, respectively. D. paradoxum was characterized by 8 two-armed chromosomes, first three pairs were metacentric (18.3-12um), fourth pair was subtelocentric (4.3um). Well-defined secondary constrictions were localized at specific sites of chromosomes in the karyotypes of all examined species. P. sapae and P. nagibinae showed high similarities in their karyotypes which could indicate their close phylogenetic relationship. Chromosomes of P. bliccae resembled those of the congeners; however, the secondary constriction was localized differently. The most distinct species, D. paradoxum, showed a markedly different karyotype. Hypothetically, karyotypes with 14 telocentric chromosomes might represent an ancestral type and the metacentric chromosomes of D. paradoxum could evolve by centric fusions of the first 6 telocentric pairs of ancestral chromosomes. |
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