Deciphering reticulate evolution of the largest group of polyploid vertebrates, the subfamily cyprininae (Teleostei: Cypriniformes).

Molecular Phylogenetics and Evolution
Lei YangRichard L Mayden

Abstract

Despite the rarity of polyploidy in animals, some groups with polyploid species exhibit complicated and interesting patterns of reticulate evolution. Here we focus on fishes in the subfamily Cyprininae, the largest polyploid group of vertebrates. The large number of polyploid taxa poses significant challenges for phylogenetic and evolutionary studies on this subfamily. In this study, we cloned and sequenced three single-copy nuclear loci to investigate the evolution of polyploidy in the Cyprininae. Topologies of nuclear gene trees were compared with a newly reconstructed mitochondrial tree. The data provided herein corroborate the hybrid origins of the tribes Torini, Cyprinini, Spinibarbini, Barbini, and also Probarbini. Based on results from this study and previous studies, we hypothesize that at least 13 independent polyploidization events have occurred during the evolution of the Cyprininae. We offer hypotheses on the origin of each polyploid group and show that a diploid group or the diploid ancestor of a polyploid group might have served as progenitor of one or two other polyploid groups. The evolutionary history of Cyprinine (since its first divergence) can be divided into three stages: the "Diploid stage" (69.2-43.4 Ma o...Continue Reading

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