Mode de spéciation
Posté : 30 janv. 2009 00:41
Salut,
un article qui discute des modes de spéciations. Ca parle pas spécialement de cichlidés, mais ce qui y est dit est valable pour les cichlidés. Je ne l'ai pas lu, juste survolé et il me parait intéressant ne serait ce parce qu'il explicite différents mécanismes qui vont amener une ou plusieurs populations à donner naissance à de nouvelles espèces. Au passage les auteurs discutent différentes façons de conceptualiser la spéciation, différentes façons d'aborder ce problème.
Review. Sympatric, parapatric or allopatric: the most important way to classify speciation?
Volume 363, Number 1506 / September 27, 2008
Authors
Roger K. Butlin, Juan Galindo, John W. Grahame
Abstract
The most common classification of modes of speciation begins with the spatial context in which divergence occurs: sympatric, parapatric or allopatric. This classification is unsatisfactory because it divides a continuum into discrete categories, concentrating attention on the extremes, and it subordinates other dimensions on which speciation processes vary, such as the forces driving differentiation and the genetic basis of reproductive isolation. It also ignores the fact that speciation is a prolonged process that commonly has phases in different spatial contexts. We use the example of local adaptation and partial reproductive isolation in the intertidal gastropod Littorina saxatilis to illustrate the inadequacy of the spatial classification of speciation modes. Parallel divergence in shell form in response to similar environmental gradients in England, Spain and Sweden makes this an excellent model system. However, attempts to demonstrate ‘incipient’ and ‘sympatric’ speciation involve speculation about the future and the past. We suggest that it is more productive to study the current balance between local adaptation and gene flow, the interaction between components of reproductive isolation and the genetic basis of differentiation.
Keywords
Littorina saxatilis, local adaptation, incipient species, parallel speciation, reproductive isolation
j'ai le pdf pour ceux que ça intéresse
Séb
un article qui discute des modes de spéciations. Ca parle pas spécialement de cichlidés, mais ce qui y est dit est valable pour les cichlidés. Je ne l'ai pas lu, juste survolé et il me parait intéressant ne serait ce parce qu'il explicite différents mécanismes qui vont amener une ou plusieurs populations à donner naissance à de nouvelles espèces. Au passage les auteurs discutent différentes façons de conceptualiser la spéciation, différentes façons d'aborder ce problème.
Review. Sympatric, parapatric or allopatric: the most important way to classify speciation?
Volume 363, Number 1506 / September 27, 2008
Authors
Roger K. Butlin, Juan Galindo, John W. Grahame
Abstract
The most common classification of modes of speciation begins with the spatial context in which divergence occurs: sympatric, parapatric or allopatric. This classification is unsatisfactory because it divides a continuum into discrete categories, concentrating attention on the extremes, and it subordinates other dimensions on which speciation processes vary, such as the forces driving differentiation and the genetic basis of reproductive isolation. It also ignores the fact that speciation is a prolonged process that commonly has phases in different spatial contexts. We use the example of local adaptation and partial reproductive isolation in the intertidal gastropod Littorina saxatilis to illustrate the inadequacy of the spatial classification of speciation modes. Parallel divergence in shell form in response to similar environmental gradients in England, Spain and Sweden makes this an excellent model system. However, attempts to demonstrate ‘incipient’ and ‘sympatric’ speciation involve speculation about the future and the past. We suggest that it is more productive to study the current balance between local adaptation and gene flow, the interaction between components of reproductive isolation and the genetic basis of differentiation.
Keywords
Littorina saxatilis, local adaptation, incipient species, parallel speciation, reproductive isolation
j'ai le pdf pour ceux que ça intéresse
Séb
