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Citation for Study 10384

Citation title: "Loss of sexual recombination and segregation is associated with increased diversification in Evening Primroses".

Study name: "Loss of sexual recombination and segregation is associated with increased diversification in Evening Primroses".

This study is part of submission 10374 (Status: Published).

Citation

Johnson M.T., Fitzjohn R., Smith S.D., Rausher M., & Otto S. 2011. Loss of sexual recombination and segregation is associated with increased diversification in Evening Primroses. Evolution, .

Authors

• Johnson M.T.
• Fitzjohn R.
• Smith S.D. (submitter) 919 684 3378
• Rausher M.
• Otto S.

Abstract

The loss of sexual recombination and segregation in asexual organisms has been portrayed as an irreversible process that commits asexually-reproducing lineages to reduced diversification. We test this hypothesis by estimating rates of speciation, extinction, and transition between sexuality and functional asexuality in the evening primroses. Specifically, we estimate these rates using the recently developed BiSSE (Binary State Speciation and Extinction) phylogenetic comparative method, which employs maximum likelihood and Bayesian techniques. We infer that net diversification rates (speciation minus extinction) in functionally asexual evening primrose lineages are roughly eight times faster than diversification rates in sexual lineages, largely due to higher speciation rates in asexual lineages. We further reject the hypothesis that a loss of recombination and segregation is irreversible because the transition rate from functional asexuality to sexuality is significantly greater than zero.and in fact exceeded the reverse rate. These results provide the first empirical evidence in support of the alternative theoretical prediction that asexual populations should instead diversify more rapidly than sexual populations because they are free from the homogenizing effects of sexual recombination and segregation. Although asexual reproduction may often constrain adaptive evolution, our results show that the loss of recombination and segregation need not be an evolutionary dead-end in terms of diversification of lineages.

Keywords

apomixis, comparative biology, Oenothera, translocation heterozygote,

External links

• DOI: 10.1111/j.1558-5646.2011.01378.x

About this resource

• Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S10384
• Other versions: Nexus NeXML
• Show BibTeX reference

  		@ARTICLE{TreeBASE2Ref19874,
  	 author = {Marc T. Johnson and Richard G.  FitzJohn and Stacey DeWitt Smith and Mark D.  Rausher and Sarah P.  Otto},
  	 title = {Loss of sexual recombination and segregation is associated with increased diversification in Evening Primroses},
  	 year = {2011},
  	 keywords = {apomixis, comparative biology, Oenothera, translocation heterozygote,},
  	 doi = {10.1111/j.1558-5646.2011.01378.x},
  	 url = {http://},
  	 pmid = {},
  	 journal = {Evolution},
  	 volume = {},
  	 number = {},
  	 pages = {},
  	 abstract = {The loss of sexual recombination and segregation in asexual organisms has been
  portrayed as an irreversible process that commits asexually-reproducing lineages to reduced diversification. We test this hypothesis by estimating rates of speciation, extinction, and transition between sexuality and functional asexuality in the evening primroses. Specifically, we estimate these rates using the recently developed BiSSE (Binary State Speciation and Extinction) phylogenetic comparative method, which employs maximum likelihood and Bayesian techniques. We infer that net diversification rates (speciation minus extinction) in functionally asexual evening primrose lineages are roughly eight times faster than diversification rates in sexual lineages, largely due to higher speciation rates in asexual lineages. We further reject the hypothesis that a loss of recombination and segregation is irreversible because the transition rate from functional asexuality to sexuality is significantly greater than zero.and in fact exceeded the reverse rate. These results provide the first empirical evidence in support of the alternative theoretical prediction that asexual populations should instead diversify more rapidly than sexual populations because they are free from the homogenizing effects of sexual recombination and segregation. Although asexual reproduction may often 
  constrain adaptive evolution, our results show that the loss of recombination and segregation need not be an evolutionary dead-end in terms of diversification of
  lineages.}
  }
  		

• Show RIS reference

  		TY  - JOUR
  ID  - 19874
  AU  - Johnson,Marc T.
  AU  - FitzJohn,Richard G. 
  AU  - Smith,Stacey DeWitt
  AU  - Rausher,Mark D. 
  AU  - Otto,Sarah P. 
  T1  - Loss of sexual recombination and segregation is associated with increased diversification in Evening Primroses
  PY  - 2011
  KW  - apomixis
  KW  - comparative biology
  KW  - Oenothera
  KW  - translocation heterozygote
  UR  - http://dx.doi.org/10.1111/j.1558-5646.2011.01378.x
  N2  - The loss of sexual recombination and segregation in asexual organisms has been
  portrayed as an irreversible process that commits asexually-reproducing lineages to reduced diversification. We test this hypothesis by estimating rates of speciation, extinction, and transition between sexuality and functional asexuality in the evening primroses. Specifically, we estimate these rates using the recently developed BiSSE (Binary State Speciation and Extinction) phylogenetic comparative method, which employs maximum likelihood and Bayesian techniques. We infer that net diversification rates (speciation minus extinction) in functionally asexual evening primrose lineages are roughly eight times faster than diversification rates in sexual lineages, largely due to higher speciation rates in asexual lineages. We further reject the hypothesis that a loss of recombination and segregation is irreversible because the transition rate from functional asexuality to sexuality is significantly greater than zero.and in fact exceeded the reverse rate. These results provide the first empirical evidence in support of the alternative theoretical prediction that asexual populations should instead diversify more rapidly than sexual populations because they are free from the homogenizing effects of sexual recombination and segregation. Although asexual reproduction may often 
  constrain adaptive evolution, our results show that the loss of recombination and segregation need not be an evolutionary dead-end in terms of diversification of
  lineages.
  L3  - 10.1111/j.1558-5646.2011.01378.x
  JF  - Evolution
  VL  - 
  IS  - 
  ER  -