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HYBRIDIZATION STUDIES IN THE MIGRATORY GRASSHOPPER MELANOPLUS SANGUINIPES (F.) (ACRIDIDAE)

Published online by Cambridge University Press:  31 May 2012

William Chapco
William Chapco
Affiliation:
Department of Biology, University of Regina, Regina, Saskatchewan, Canada S4S 0A2
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Abstract

Three subspecies of the migratory grasshopper Melanoplus sanguinipes (F.) are recognized by Gurney and Brooks (1959) who, on the basis of morphology and presence of intergrades in collections, do not consider the taxa sufficiently different to warrant according them species status. Present experiments show that members of distant populations, when crossed, readily produce viable and fertile hybrids of both sexes. It is, however, premature to claim that the groups are conspecific without confirmatory information on, for instance, genetic distances and mating discrimination indices. Nonetheless, it is hypothesized that these parameters are expected to have low values given the hybridization results.

Résumé

Trois sous-espèces du petit criquet migrateur Melanoplus sanguinipes (F.) ont été reconnues par Gurney et Brooks (1959) qui, à cause de leur morphologie et de la présence d’individus intermédiaires aux collections, n’ont pas considéré ces taxons suffisamment différents pour valoir l’état d’espèces. Les épreuves actuelles ont démontré que des membres des populations distantes, après croisement, produisent des hybrides viables et féconds des deux sexes. Cependant, il serait prématuré à prétendre que les groupes sont de la même espèce sans des connaissances confirmatives concernant, par exemple, les distances génétiques et les indices de discrimination d’accouplement. Néanmoins, on a suggéré que les valeurs de ces paramètres seraient prévues d’être bases, vu les résultats d’hybridation.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 3 , June 1991 , pp. 417 - 423
Copyright
Copyright © Entomological Society of Canada 1991

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