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Geographic distribution and seasonal variation of mitochondrial DNA haplotypes in the aphid Rhopalosiphum padi (Hemiptera: Aphididae)

Published online by Cambridge University Press:  10 July 2009

D. Martinez-Torres ,
A. Moya ,
P.D.N. Hebert  and
J.-C. Simon
D. Martinez-Torres
Affiliation:
Departament de Genètica, Facultat de Ciènces Biologiques, Universitat de València, Dr Moliner 50, 46100 Burjassot, València, Spain: Laboratoire de Zoologie, INRA, B.P. 29, 35650 Le Rheu, France
A. Moya
Affiliation:
Departament de Genètica, Facultat de Ciènces Biologiques, Universitat de València, Dr Moliner 50, 46100 Burjassot, València, Spain:
P.D.N. Hebert
Affiliation:
Department of Zoology, University of Guelph, Guelph, Canada, N1G 2W1:
J.-C. Simon*
Affiliation:
Laboratoire de Zoologie, INRA, B.P. 29, 35650 Le Rheu, France
*
* Author for correspondence.
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Abstract

This study examines the spatial and seasonal patterning of mitochondrial DNA diversity in French populations of the bird cherry-oat aphid, Rhopalosiphum padi (Linnaeus), on both its primary and secondary hosts. Our results confirm the presence of two major mitochondrial lineages that are generally associated with the breeding system variation (cyclic and obligate parthenogenesis) shown by this species. The strength of this relationship varies regionally, being most evident in the south and west. Cyclically parthenogenetic populations show no significant regional or seasonal genetic divergence reflecting high levels of gene flow, possibly promoted by their obligate host-alternation. However, obligately parthenogenetic populations show a north-south cline in the distribution of the dominant haplotypes. This pattern might result from a selective advantage of some obligately parthenogenetic lineages under cold temperature regime. Alternatively, this cline might be established by a gradient in the intensity of nuclear gene flow between cyclically and obligately parthenogenetic populations mediated by androcyclic males. The discrimination between these possible explanations will require extending analysis to include hypervariable nuclear markers.

Information

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 87 , Issue 2 , April 1997 , pp. 161 - 167
Copyright
Copyright © Cambridge University Press 1997

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