Molecular phylogenetic relationships and the evolution of the placenta in Poecilia (Micropoecilia) (Poeciliidae

Cyprinodontiformes)

Robert Meredith, Marcelo N. Pires, David N. Reznick, Mark S. Springer

Research output: Contribution to journalArticleResearchpeer-review

30 Citations (Scopus)

Abstract

Poeciliids are one of the most intensively studied groups within Cyprinodontiformes owing to their use as model organisms for experimental studies on natural and sexual selection, and comparative studies of life-history evolution. Life-history studies have demonstrated multiple origins of placentotrophy and superfetation in poeciliids, including the recent description of placentotrophy in three species of Poecilia (Micropoecilia): P. bifurca, P. branneri, and P. parae. Here, we use a concatenation of seven nuclear gene segments and two mitochondrial segments to examine relationships within Micropoecilia and between this subgenus and other subgenera in Poecilia (Mollienesia, Limia, Pamphorichthys, Acanthophacelus). The combined molecular data set (8668 bp) was analyzed with maximum parsimony, maximum likelihood, and Bayesian methods. We also employed a relaxed molecular clock method to estimate divergence times within Poecilia. All phylogenetic analyses with the combined DNA data set supported the monophyly of Poecilia and recovered a basal split between Poecilia (Acanthophacelus) + Poecilia (Micropoecilia) and the other three subgenera. Within Micropoecilia, P. bifurca grouped with P. branneri, and these joined P. parae to the exclusion of P. picta. Ancestral reconstructions based on parsimony and Bayesian methods suggest that placentotrophy evolved once in Micropoecilia in the common ancestor of P. bifurca, P. branneri, and P. parae. Divergence time estimates suggest that placentotrophy in Micropoecilia evolved in ≤4 million years.

Original languageEnglish
Pages (from-to)631-639
Number of pages9
JournalMolecular Phylogenetics and Evolution
Volume55
Issue number2
DOIs
StatePublished - 1 May 2010

Fingerprint

Cyprinodontiformes
Poecilia
Poeciliidae
placenta
Placenta
phylogenetics
phylogeny
life history
divergence
Bayes Theorem
common ancestry
Bayesian theory
sexual selection
natural selection
Superfetation
comparative study
experimental study
DNA
gene
Genetic Selection

Keywords

  • Acanthophacelus
  • Cyprinodontiformes
  • Micropoecilia
  • Placentotrophy
  • Poecilia
  • Poeciliidae

Cite this

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title = "Molecular phylogenetic relationships and the evolution of the placenta in Poecilia (Micropoecilia) (Poeciliidae: Cyprinodontiformes)",
abstract = "Poeciliids are one of the most intensively studied groups within Cyprinodontiformes owing to their use as model organisms for experimental studies on natural and sexual selection, and comparative studies of life-history evolution. Life-history studies have demonstrated multiple origins of placentotrophy and superfetation in poeciliids, including the recent description of placentotrophy in three species of Poecilia (Micropoecilia): P. bifurca, P. branneri, and P. parae. Here, we use a concatenation of seven nuclear gene segments and two mitochondrial segments to examine relationships within Micropoecilia and between this subgenus and other subgenera in Poecilia (Mollienesia, Limia, Pamphorichthys, Acanthophacelus). The combined molecular data set (8668 bp) was analyzed with maximum parsimony, maximum likelihood, and Bayesian methods. We also employed a relaxed molecular clock method to estimate divergence times within Poecilia. All phylogenetic analyses with the combined DNA data set supported the monophyly of Poecilia and recovered a basal split between Poecilia (Acanthophacelus) + Poecilia (Micropoecilia) and the other three subgenera. Within Micropoecilia, P. bifurca grouped with P. branneri, and these joined P. parae to the exclusion of P. picta. Ancestral reconstructions based on parsimony and Bayesian methods suggest that placentotrophy evolved once in Micropoecilia in the common ancestor of P. bifurca, P. branneri, and P. parae. Divergence time estimates suggest that placentotrophy in Micropoecilia evolved in ≤4 million years.",
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Molecular phylogenetic relationships and the evolution of the placenta in Poecilia (Micropoecilia) (Poeciliidae : Cyprinodontiformes). / Meredith, Robert; Pires, Marcelo N.; Reznick, David N.; Springer, Mark S.

In: Molecular Phylogenetics and Evolution, Vol. 55, No. 2, 01.05.2010, p. 631-639.

Research output: Contribution to journalArticleResearchpeer-review

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KW - Placentotrophy

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