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Chromosome number in Dendroctonus micans and karyological divergence within the genus Dendroctonus (Coleoptera: Scolytidae)

Published online by Cambridge University Press:  31 May 2012

Gerardo Zúñiga ,
Yolanda Salinas-Moreno ,
Jane L. Hayes ,
Jean Claude Grégoire  and
Ramón Cisneros
Gerardo Zúñiga*
Affiliation:
Laboratorio de Variación Biológica y Evolución, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, CP 11340 México, DF México
Yolanda Salinas-Moreno
Affiliation:
Laboratorio de Variación Biológica y Evolución, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, CP 11340 México, DF México
Jane L. Hayes
Affiliation:
USDA Forest Service, Pacific Northwest Research Station, Forestry and Range Sciences Laboratory, 1401 Gekeler Lane, La Grande, Oregon, United States 97850
Jean Claude Grégoire
Affiliation:
Animal and Cell Biology Laboratory, Free University of Brussels, 1050 Brussels, Belgium
Ramón Cisneros
Affiliation:
Laboratorio de Variación Biológica y Evolución, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, CP 11340 México, DF México
*
1 Corresponding author (e-mail: gzuniga@bios.encb.ipn.mx).
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Abstract

The meiotic formula of the European spruce beetle, Dendroctonus micans (Kugelann), is 10 AA + Xyp in males and 10 AA + XX in females. This karyotype is different from the morphologically similar Dendroctonus punctatus LeConte (14 AA + Xyp), which is consistent with the taxonomic validity of both species. The chromosome number found in D. micans, added to karyological data from other species of the genus Dendroctonus Erichson, suggest that the karyological diversification within this genus may have occurred in two directions: one toward more southerly latitudes in North America and the other toward Europe and Asia.

Résumé

La formule méiotique de dendroctone de l’épicéa, Dendroctonus micans (Kugelann), est 10 AA + Xyp chez les mâles et 10 AA + XX chez les femelles. Cette formule méiotique est différente de celle de l’espèce conspécifique Dendroctonus punctatus LeConte (14 AA + Xyp), ce qui confirme la validité taxonomique des deux espèces. De plus, le nombre de chromosomes trouvés chez D. micans, en combinaison avec les karyotypes des autres espèces du genre Dendroctonus Erichson suggère que la diversification karyotypique du genre s’est produite selon deux modalités : d’une part en direction de latitudes plus méridionales en Amérique du Nord, d’autre part vers l’Europe et l’Asie.

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 4 , August 2002 , pp. 503 - 510
Copyright
Copyright © Entomological Society of Canada 2002

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