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Updated: Jan 24, 2026

Molecular Evolution of the Tre Recombinase
Published on: May 29, 2008
Rapid divergence, molecular evolution, and morphological diversification of coastal host-parasite systems from
Marlus Bueno-Silva1,2, Walter A Boeger1
1Laboratório de Ecologia Molecular e Parasitologia Evolutiva (LEMPE), Departamento de Zoologia, Centro Politécnico, Setor de Ciências Biológicas, Universidade Federal do Paraná (UFPR), Caixa Postal 19073, CEP 81531-980, Curitiba, Paraná, Brazil.
Abstract:
This study assessed the role of historical processes on the geographic isolation, molecular evolution, and morphological diversification of host-parasite populations from the southern Brazilian coast. Adult specimens of Scleromystax barbatus and Scleromystax macropterus were collected from the sub-basin of the Nhundiaquara River and the sub-basin of the Paranaguá Bay, state of Paraná, Brazil. Four species of Gyrodactylus were recovered from the body surface of both host species. Morphometric analysis of Gyrodactylus spp. and Scleromystax spp. indicated that subpopulations of parasites and hosts could be distinguished from different sub-basins and locations, but the degree of morphological differentiation seems to be little related to geographic distance between subpopulations. Phylogenetic relationships based on DNA sequences of Gyrodactylus spp. and Scleromystax spp. allowed distinguishing lineages of parasites and hosts from different sub-basins. However, the level of genetic structuring of parasites was higher in comparison to host species. Evidence of positive selection in mtDNA sequences is likely associated with local adaptation of lineages of parasites and hosts. A historical demographic analysis revealed that populations of Gyrodactylus and Scleromystax have expanded in the last 250 000 years. The genetic variation of parasites and hosts is consistent with population-specific selection, population expansions, and recent evolutionary co-divergence.
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