Coevolutionary studies aim at testing specific hypotheses to understand the patterns of historical associations between parasites and their hosts. Fish-monogenoidean systems provide an interesting model for historical associations due to their high specificity. Therefore, the aim of the present project is to verify whether the relationship between Chauhanellus spp. and Hamatopeduncularia spp. and their ariids hosts along the Brazilian coast can be explained by means of cospeciation processes. Twelve marine catfish species and 10 monogenoidean species will be studied in the present work. Partial DNA sequences of genes RAG2 and Cytb of the fish hosts and of genes 28S rDNA, ITS1, 5.8S and ITS2 of the parasite species will be used for phylogenetic reconstruction. Maximum likelihood and Bayesian inference phylogenetic trees of the host and parasite species will be built and used for analyses of topological congruence comparing the effectiveness of the methods Procrustean Approach to Cophylogeny (PACo) and Random Tanglegram Partitions (Random TaPas) to evaluate the role of cospeciation in the diversification of these species, as opposed to duplication and host-switching events.
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