Phylogeny, evolution and coevolutionary interactions in host-parasite system Cichlidae-Monogenea
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| Year of publication | 2012 |
| Type | Conference abstract |
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| Description | Five genera of monogeneans belonging to the Dactylogyridea, Bychowsky, 1937 (Cichlidogyrus Paperna, 1960, Scutogyrus Pariselle & Euzet, 1995, Onchobdella Paperna, 1968, Enterogyrus Paperna, 1963 and Urogyrus Bilong-Bilong, Birgi & Euzet, 1994) have been proposed on African freshwater fish of Cichlidae. Monogenean species were collected from six cichlid host species (Hemichromis fasciatus, H. letourneuxi, Tilapia guineensis, Oreochromis niloticus, Sarotherodon galilaeus and Tylochromis intermedius) in the National Park Niokolo Koba (Senegal, Africa). The objectives of this study were to investigate phylogenetic and evolutionary patterns and processes of West African cichlid fish and their monogenean parasites of the genus Cichlidogyrus and Scutogyrus, and to reveal the presence of host-parasite cospeciation. Molecular phylogeny of monogeneans inferred from ribosomal DNA sequences suggested that Cichlidogyrus is polyphyletic and Scutogyrus is monophyletic, and supported the monophyletic origin of the Cichlidogyrus/Scutogyrus group. Phylogenetic analysis of Cichlidae supported the separation of mouthbrooders and substrate-brooders and confirmed the hypothesis that the mouthbrooding behavior of Sarotherodon and Oreochromis evolved from substrate-brooding behavior. The cophylogenetic analyses indicated a significant fit between host and parasite phylogenetic trees using distance-based methods. Tree-based methods, however, found no significant cospeciation signal, which suggests the presence of parasite duplications and host switches on related host species. |
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