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 language | English |
|---|---|
| Pages (from-to) | 631-639 |
| Number of pages | 9 |
| Journal | Molecular Phylogenetics and Evolution |
| Volume | 55 |
| Issue number | 2 |
| DOIs | |
| State | Published - 1 May 2010 |
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Keywords
- Acanthophacelus
- Cyprinodontiformes
- Micropoecilia
- Placentotrophy
- Poecilia
- Poeciliidae
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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 journal › Article › Research › peer-review
TY - JOUR
T1 - Molecular phylogenetic relationships and the evolution of the placenta in Poecilia (Micropoecilia) (Poeciliidae
T2 - Cyprinodontiformes)
AU - Meredith, Robert
AU - Pires, Marcelo N.
AU - Reznick, David N.
AU - Springer, Mark S.
PY - 2010/5/1
Y1 - 2010/5/1
N2 - 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.
AB - 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.
KW - Acanthophacelus
KW - Cyprinodontiformes
KW - Micropoecilia
KW - Placentotrophy
KW - Poecilia
KW - Poeciliidae
UR - http://www.scopus.com/inward/record.url?scp=77950028108&partnerID=8YFLogxK
U2 - 10.1016/j.ympev.2009.11.006
DO - 10.1016/j.ympev.2009.11.006
M3 - Article
VL - 55
SP - 631
EP - 639
JO - Molecular Phylogenetics and Evolution
JF - Molecular Phylogenetics and Evolution
SN - 1055-7903
IS - 2
ER -