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Benrey, Betty

Nom
Benrey, Betty
Affiliation principale
Email
Betty.Benrey@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/604
_
0000-0002-3230-4450

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  • Publication
    Accès libre
    Anthropogenic effects on population genetics of phytophagous insects associated with domesticated plants
    (2007)
    Alvarez, Nadir
    ;
    Hossaert-McKey, Martine
    ;
    Restoux, Gwendal
    ;
    Delgado-Salinas, Alfonso
    ;
    Benrey, Betty 
    The hypothesis of isolation by distance (IBD) predicts that genetic differentiation between populations increases with geographic distance. However, gene flow is governed by numerous factors and the correlation between genetic differentiation and geographic distance is never simply linear. In this study, we analyze the interaction between the effects of geographic distance and of wild or domesticated status of the host plant on genetic differentiation in the bean beetle Acanthoscelides obvelatus. Geographic distance explained most of the among-population genetic differentiation. However, IBD varied depending on the kind of population pairs for which the correlation between genetic differentiation and geographic distance was examined. Whereas pairs of beetle populations associated with wild beans showed significant IBD (P< 10−4), no IBD was found when pairs of beetle populations on domesticated beans were examined (P = 0.2992). This latter result can be explained by long-distance migrations of beetles on domesticated plants resulting from human exchanges of bean seeds. Beetle populations associated with wild beans were also significantly more likely than those on domesticated plants to contain rare alleles. However, at the population level, beetles on cultivated beans were similar in allelic richness to those on wild beans. This similarity in allelic richness combined with differences in other aspects of the genetic diversity (i.e., IBD, allelic diversity) is compatible with strongly contrasting effects of migration and drift. This novel indirect effect of human actions on gene flow of a serious pest of a domesticated plant has important implications for the spread of new adaptations such as resistance to pesticides.
  • Publication
    Accès libre
    Isolation and characterization of polymorphic microsatellite loci in Acanthoscelides obvelatus Say (Coleoptera: Bruchidae)
    (2004)
    Alvarez, Nadir
    ;
    Born, Céline
    ;
    Risterucci, A.-M.
    ;
    Sourrouille, P.
    ;
    Benrey, Betty 
    ;
    Hossaert-McKey, Martine
    Six microsatellite loci were isolated from the bruchid Acanthoscelides obtectus Say (Coleoptera: Bruchidae). Each locus was polymorphic, with the number of alleles ranging from 3 to 18. We found high levels of within-population variation at most loci, with heterozygosities ranging from 0 to 0.75. Cross-species amplification of these loci was tested in two other species of the genus Acanthoscelides, A. obvelatus Bridwell and A. argillaceus Sharp.
  • Publication
    Accès libre
    Isolation and characterization of polymorphic microsatellite loci in Acanthoscelides obvelatus Bridwell (Coleoptera: Bruchidae)
    (2003)
    Alvarez, Nadir
    ;
    Aebi, Alexandre 
    ;
    Risterucci, A.-M.
    ;
    Hossaert-McKey, Martine
    ;
    Benrey, Betty 
    Five microsatellite loci were isolated from the bruchid Acanthoscelides obvelatus Bridwell (Coleoptera: Bruchidae). Each locus was polymorphic, with the number of alleles ranging from two to 15. We found high levels of within-population variation at most loci, with heterozygosity ranging from 0.182 to 0.900. Cross-species amplification of these loci was tested in two other species of the genus Acanthoscelides, A. obtectus Say and A. argillaceus Sharp.
  • Publication
    Accès libre
    Isolation and characterization of polymorphic microsatellite markers in Zabrotes subfasciatus Boheman (Coleoptera: Bruchidae)
    Aebi, Alexandre 
    ;
    Shani, Tal
    ;
    Butcher, R.D.J
    ;
    Alvarez, N
    ;
    Risterucci, A.M
    ;
    Benrey, Betty 
    Bruchid beetles of the genus Zabrotes (Coleoptera: Bruchidae) are important worldwide pests of legume seeds. Samples of Zabrotes subfasciatus and Z. sylvestris were collected from seeds of two Phaseolus species throughout Mexico to assess the role of host plant variation and plant domestication on the evolution of host use in this species. For this purpose six polymorphic microsatellite loci were isolated and characterized for the bruchid Z. subfasciatus. Cross-species amplification tests were performed on Z. sylvestris and revealed that three loci amplified successfully and were polymorphic in this closely related species.
  • Publication
    Accès libre
    Horismenus species (Hymenoptera: Eulophidae) in a bruchid beetle parasitoid guild, including the description of a new species
    Hansson, Christer
    ;
    Aebi, Alexandre 
    ;
    Benrey, Betty 
    Four species of Horismenus (Hymenoptera: Eulophidae) associated with Acanthoscelides spp.(Coleoptera: Bruchidae), three of which are also associated with Phaseolus spp., are treated. One of the species, H. butcheri, is described as new and the remaining three species are redescribed. Allfour species are diagnosed in a key. A lectotype is designated for Holcopelte productus Ashmead.