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Abstract:

The central-marginal model is widely accepted in chromosomally polymorphic species of Drosophila. In fact, geographically and ecologically central populations of Drosophila show higher levels of polymorphism for paracentric inversions, whereas marginal populations tend to be monomorphic. This fact has been variously explained. Chromosomal polymorphisms in grasshoppers have also been attributed to show such geographical structuring, as in the case of the South-American grasshopper Dichroplus pratensis Bruner (Orthoptera: Acrididae). However, in three other cases involving Acrididae - Leptysma argentina Bruner, Trimerotropis pallidipennis (Burmeister) and Cornops aquaticum (Bruner), it is clear that chromosomal polymorphisms (sometimes with a wide extension over the Argentine area) do not conform to this pattern, and show instead clear correlations with environmental vari- ables, especially minimum temperature, showing low or null frequencies of the rearrangements at one extreme of the environmental gradient and with high or fixed frequencies at the other. Furthermore, this correlation with temperature might also be true in the case of D. pratensis. These aforementioned examples emphasise the dangers of over-generalization when discussing chromosomal polymorphisms, and suggests that such polymorphisms should be considered very much in a case-specific manner in terms of the particular genetic system under study.

Registro:

Documento: Artículo
Título:Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae)
Autor:Colombo, P.C.
Filiación:Laboratorio de Genética, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, (1428) Ciudad Universitaria, Buenos Aires, Argentina
Palabras clave:Acrididae; Central-marginal model; Chromosomal polymorphisms; Environmental gradient; Grasshoppers; Orthoptera; Recombination; chromosome; environmental factor; environmental gradient; grasshopper; modeling; polymorphism; recombination
Año:2012
Volumen:109
Número:3
Página de inicio:317
Página de fin:324
DOI: http://dx.doi.org/10.14411/eje.2012.041
Título revista:European Journal of Entomology
Título revista abreviado:Eur. J. Entomol.
ISSN:12105759
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12105759_v109_n3_p317_Colombo

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Citas:

---------- APA ----------
(2012) . Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae). European Journal of Entomology, 109(3), 317-324.
http://dx.doi.org/10.14411/eje.2012.041
---------- CHICAGO ----------
Colombo, P.C. "Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae)" . European Journal of Entomology 109, no. 3 (2012) : 317-324.
http://dx.doi.org/10.14411/eje.2012.041
---------- MLA ----------
Colombo, P.C. "Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae)" . European Journal of Entomology, vol. 109, no. 3, 2012, pp. 317-324.
http://dx.doi.org/10.14411/eje.2012.041
---------- VANCOUVER ----------
Colombo, P.C. Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae). Eur. J. Entomol. 2012;109(3):317-324.
http://dx.doi.org/10.14411/eje.2012.041