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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Detalles Bibliográficos
Autor principal: Colombo, P.C.
Formato: JOUR
Materias:
Acrididae
Central-marginal model
Chromosomal polymorphisms
Environmental gradient
Grasshoppers
Orthoptera
Recombination
chromosome
environmental factor
environmental gradient
grasshopper
modeling
polymorphism
recombination
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_12105759_v109_n3_p317_Colombo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_12105759_v109_n3_p317_Colombo
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spelling todo:paper_12105759_v109_n3_p317_Colombo2023-10-03T16:09:01Z Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae) Colombo, P.C. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, P.C.
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.
format JOUR
author Colombo, P.C.
author_facet Colombo, P.C.
author_sort Colombo, P.C.
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)
url http://hdl.handle.net/20.500.12110/paper_12105759_v109_n3_p317_Colombo
work_keys_str_mv AT colombopc againstthecentralmarginalmodelthreecasesinchromosomallypolymorphicgrasshoppersorthopteraacrididae
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