Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae)
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 h...
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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12105759_v109_n3_p317_Colombo http://hdl.handle.net/20.500.12110/paper_12105759_v109_n3_p317_Colombo |
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paper:paper_12105759_v109_n3_p317_Colombo2023-06-08T16:10:03Z Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae) Colombo, Pablo Cesar Acrididae Central-marginal model Chromosomal polymorphisms Environmental gradient Grasshoppers Orthoptera Recombination chromosome environmental factor environmental gradient grasshopper modeling polymorphism recombination 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. Fil:Colombo, P.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12105759_v109_n3_p317_Colombo http://hdl.handle.net/20.500.12110/paper_12105759_v109_n3_p317_Colombo |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Acrididae Central-marginal model Chromosomal polymorphisms Environmental gradient Grasshoppers Orthoptera Recombination chromosome environmental factor environmental gradient grasshopper modeling polymorphism recombination |
spellingShingle |
Acrididae Central-marginal model Chromosomal polymorphisms Environmental gradient Grasshoppers Orthoptera Recombination chromosome environmental factor environmental gradient grasshopper modeling polymorphism recombination Colombo, Pablo Cesar Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae) |
topic_facet |
Acrididae Central-marginal model Chromosomal polymorphisms Environmental gradient Grasshoppers Orthoptera Recombination chromosome environmental factor environmental gradient grasshopper modeling polymorphism recombination |
description |
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. |
author |
Colombo, Pablo Cesar |
author_facet |
Colombo, Pablo Cesar |
author_sort |
Colombo, Pablo Cesar |
title |
Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae) |
title_short |
Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae) |
title_full |
Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae) |
title_fullStr |
Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae) |
title_full_unstemmed |
Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae) |
title_sort |
against the central-marginal model: three cases in chromosomally polymorphic grasshoppers (orthoptera: acrididae) |
publishDate |
2012 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12105759_v109_n3_p317_Colombo http://hdl.handle.net/20.500.12110/paper_12105759_v109_n3_p317_Colombo |
work_keys_str_mv |
AT colombopablocesar againstthecentralmarginalmodelthreecasesinchromosomallypolymorphicgrasshoppersorthopteraacrididae |
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1768546736328933376 |