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Phylogeny of Limia (Teleostei: Poeciliidae) Based on NADH Dehydrogenase Subunit 2 Sequences

https://doi.org/10.1006/mpev.2000.0919Get rights and content

Abstract

Complete sequences for the mitochondrial gene NADH Dehydrogenase 2 (ND2) and partial sequences for the tRNA-Met and tRNA-Trp genes were obtained for 11 populations of the poeciliid fish genus (or subgenus) Limia, including species from Hispaniola, Cuba, Jamaica, and Grand Cayman Islands. Additional sequences for Limia (2 species), Pamphorichthys (3), Poecilia (16), and Xiphophorus (1), all from the tribe Poeciliini, were extracted from GenBank, as was a sequence for Heterandria formosa, from the tribe Heterandriini. Phylogenetic analyses included parsimony, distance methods, and maximum-likelihood. Several Limia species groups that had been proposed based on morphological data were evaluated. The versicolor species group was strongly supported, as was the close relationship between the Cuban Limia vittata and the Grand Cayman Limia caymanensis. However, the proposed vittata species group was not upheld by the ND2 data. The phylogenetic position of Limia melanogaster, from Jamaica, was either sister to the versicolor species group or basal to all other included Limia species. Limia was found to be monophyletic; however, Limia species from the island of Hispaniola were not monophyletic. There was little support for any proposed sister group to Limia. The phylogeny was used to reconsider a previous comparative study of poeciliid courtship behavior and sexual dimorphism. The data indicated that there may have been two independent appearances of courtship display behavior in Limia; considering the tribe Poeciliini as a whole, there is evidence for as many as five appearances of display (including two within Limia), or a complex pattern of gains and losses of such behavior. The application of phylogenetic information to the comparative study did not refute the previously hypothesized correlation between the presence of a courtship display and the presence of sexual dimorphism in poeciliid fish.

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