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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Autor principal: Sequeira, A.S
Otros Autores: Confalonieri, V.A, Vilardi, J.C
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: Indian Academy of Sciences 1997
Acceso en línea:Registro en Scopus
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100 1 |a Sequeira, A.S. 
245 1 3 |a An adaptive explanation for geographically structured allozyme variation in Dichroplus elongatus (Orthoptera: Acrididae) 
260 |b Indian Academy of Sciences  |c 1997 
270 1 0 |m Sequeira, A.S.; Depto. de Ciencias Biológicas, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Guiraldez y Costanera N., Buenos Aires, Argentina 
506 |2 openaire  |e Política editorial 
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520 3 |a 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.  |l eng 
536 |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas 
536 |a Detalles de la financiación: Universidad de Buenos Aires 
536 |a Detalles de la financiación: * Fellow of Consejo Nacional de Investigaciones Cientificas y T6cnicas; for correspondence. *Member of Consejo Nacional de Investigaciones Cientificas y T~cnicas. 
536 |a Detalles de la financiación: We would like to thank Dr M.I. Remis for reading and making usefnl comments on this manuscript. Financial support from the Universidad de Buenos Aires through grants to Dr Juan H. Hunziker and Dr Juan C. Vilardi is gratefully acknowledged. 
593 |a Depto. de Ciencias Biológicas, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Guiraldez y Costanera N., Buenos Aires, Argentina 
690 1 0 |a CLIMATIC VARIABLES 
690 1 0 |a CLINES 
690 1 0 |a ISOZYMAL VARIANTS 
690 1 0 |a ACRIDIDAE 
690 1 0 |a DICHROPLUS ELONGATUS 
690 1 0 |a ORTHOPTERA 
700 1 |a Confalonieri, V.A. 
700 1 |a Vilardi, J.C. 
773 0 |d Indian Academy of Sciences, 1997  |g v. 76  |h pp. 33-42  |k n. 1  |p J. Genet.  |x 00221333  |w (AR-BaUEN)CENRE-8447  |t Journal of Genetics 
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