An adaptive explanation for geographically structured allozyme variation in Dichroplus elongatus (Orthoptera: Acrididae)

Previous studies on allozyme variation in five populations of the grasshopper Dichroplus elongatus along a geographical gradient in Argentina revealed a significant degree of population structuring and a significant association between one of the loci (Aat-1) and latitude. As this could not be entir...

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Autores principales: Sequeira, Andrea Silvia, Confalonieri, Viviana Andrea, Vilardi, Juan Cesar
Publicado: 1997
Materias:
Climatic variables
Clines
Isozymal variants
Acrididae
Dichroplus elongatus
Orthoptera
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221333_v76_n1_p33_Sequeira
http://hdl.handle.net/20.500.12110/paper_00221333_v76_n1_p33_Sequeira
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00221333_v76_n1_p33_Sequeira
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spelling paper:paper_00221333_v76_n1_p33_Sequeira2023-06-08T14:46:35Z An adaptive explanation for geographically structured allozyme variation in Dichroplus elongatus (Orthoptera: Acrididae) Sequeira, Andrea Silvia Confalonieri, Viviana Andrea Vilardi, Juan Cesar Climatic variables Clines Isozymal variants Acrididae Dichroplus elongatus Orthoptera Previous studies on allozyme variation in five populations of the grasshopper Dichroplus elongatus along a geographical gradient in Argentina revealed a significant degree of population structuring and a significant association between one of the loci (Aat-1) and latitude. As this could not be entirely explained by historical factors, the possible adaptive significance of this locus or loci in linkage disequilibrium was investigated in the present study, with an emphasis on the role of environmental variables correlated with latitude. The present paper reports a study of the geographical organization of allozyme diversity over a wider range of the distribution of D. elongatus. The relation of allelic frequencies with geographic climatic variables was analysed. We have found (i) that different loci (Aat-1 and Pep-1) covary significantly with different variables, (ii) discordance between genetic and geographical distances, (iii) copious gene flow that would mask allelic frequency differences due solely to genetic drift, (iv) and temporal stability of the gradient found. The results suggest that causes other than drift and migration may explain the observed directional patterns of variation in D. elongatus. Fil:Sequeira, A.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Confalonieri, V.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vilardi, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1997 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221333_v76_n1_p33_Sequeira http://hdl.handle.net/20.500.12110/paper_00221333_v76_n1_p33_Sequeira
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Climatic variables
Clines
Isozymal variants
Acrididae
Dichroplus elongatus
Orthoptera
spellingShingle Climatic variables
Clines
Isozymal variants
Acrididae
Dichroplus elongatus
Orthoptera
Sequeira, Andrea Silvia
Confalonieri, Viviana Andrea
Vilardi, Juan Cesar
An adaptive explanation for geographically structured allozyme variation in Dichroplus elongatus (Orthoptera: Acrididae)
topic_facet Climatic variables
Clines
Isozymal variants
Acrididae
Dichroplus elongatus
Orthoptera
description Previous studies on allozyme variation in five populations of the grasshopper Dichroplus elongatus along a geographical gradient in Argentina revealed a significant degree of population structuring and a significant association between one of the loci (Aat-1) and latitude. As this could not be entirely explained by historical factors, the possible adaptive significance of this locus or loci in linkage disequilibrium was investigated in the present study, with an emphasis on the role of environmental variables correlated with latitude. The present paper reports a study of the geographical organization of allozyme diversity over a wider range of the distribution of D. elongatus. The relation of allelic frequencies with geographic climatic variables was analysed. We have found (i) that different loci (Aat-1 and Pep-1) covary significantly with different variables, (ii) discordance between genetic and geographical distances, (iii) copious gene flow that would mask allelic frequency differences due solely to genetic drift, (iv) and temporal stability of the gradient found. The results suggest that causes other than drift and migration may explain the observed directional patterns of variation in D. elongatus.
author Sequeira, Andrea Silvia
Confalonieri, Viviana Andrea
Vilardi, Juan Cesar
author_facet Sequeira, Andrea Silvia
Confalonieri, Viviana Andrea
Vilardi, Juan Cesar
author_sort Sequeira, Andrea Silvia
title An adaptive explanation for geographically structured allozyme variation in Dichroplus elongatus (Orthoptera: Acrididae)
title_short An adaptive explanation for geographically structured allozyme variation in Dichroplus elongatus (Orthoptera: Acrididae)
title_full An adaptive explanation for geographically structured allozyme variation in Dichroplus elongatus (Orthoptera: Acrididae)
title_fullStr An adaptive explanation for geographically structured allozyme variation in Dichroplus elongatus (Orthoptera: Acrididae)
title_full_unstemmed An adaptive explanation for geographically structured allozyme variation in Dichroplus elongatus (Orthoptera: Acrididae)
title_sort adaptive explanation for geographically structured allozyme variation in dichroplus elongatus (orthoptera: acrididae)
publishDate 1997
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221333_v76_n1_p33_Sequeira
http://hdl.handle.net/20.500.12110/paper_00221333_v76_n1_p33_Sequeira
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