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

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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, A.S., Confalonieri, V.A., Vilardi, J.C.
Formato: JOUR
Materias:
Climatic variables
Clines
Isozymal variants
Acrididae
Dichroplus elongatus
Orthoptera
Acceso en línea: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
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spelling todo:paper_00221333_v76_n1_p33_Sequeira2023-10-03T14:27:29Z An adaptive explanation for geographically structured allozyme variation in Dichroplus elongatus (Orthoptera: Acrididae) Sequeira, A.S. Confalonieri, V.A. Vilardi, J.C. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, A.S.
Confalonieri, V.A.
Vilardi, J.C.
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.
format JOUR
author Sequeira, A.S.
Confalonieri, V.A.
Vilardi, J.C.
author_facet Sequeira, A.S.
Confalonieri, V.A.
Vilardi, J.C.
author_sort Sequeira, A.S.
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)
url http://hdl.handle.net/20.500.12110/paper_00221333_v76_n1_p33_Sequeira
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