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Muscidae (Diptera) diversity in Churchill, Canada, between two time periods: evidence for limited changes since the Canadian Northern Insect Survey

  • Anaïs K. Renaud (a1), Jade Savage (a2) and Robert E. Roughley (a1)

A survey of muscid flies from Churchill, Manitoba, Canada, in 2007 yielded 155 species. Some components of species richness and composition of this contemporary assemblage were compared with those of a historical (pre-1965) assemblage, and the contribution of the three collecting methods used in the 2007 survey protocol was evaluated. Estimates of species richness indicated that Malaise traps yielded more species than did pan traps or sweep netting, and that species composition did not differ significantly between Malaise trap and pan trap catches. These results suggest that Malaise traps and sweep netting are adequate methods to survey northern Muscidae. We report little difference in estimated species richness and composition between time periods for material collected by sweep netting. When all material from the 2007 survey was pooled, 87% of the pre-1965 species were collected again in 2007. Most nonoverlapping species between time periods were rare in samples and (or) collected by different methods, suggesting a failure to detect as the most likely explanation for their absence in one assemblage. Nevertheless, the proportion of aquatic and semiaquatic species of Spilogona Schnabl was more than twice as high in the list of species not recovered in 2007 than in the pre-1965 assemblage.


Un inventaire des diptères muscidés de Churchill, Manitoba, Canada, réalisé en 2007 contient 155 espèces. Nous comparons certains éléments de la richesse et de la composition spécifiques de ce peuplement contemporain avec ceux d'un peuplement du passé (avant 1965). Nous évaluons aussi les contributions de trois méthodes de récolte utilisées dans le protocole de l'inventaire de 2007. Les estimations de la richesse spécifique indiquent que le piège de Malaise capture plus d'espèces que le piège à cuvette et le filet fauchoir, mais que la composition en espèces ne diffère pas entre les récoltes au piège de Malaise et au piège à cuvette. Ces résultats laissent croire que le piège de Malaise et le filet fauchoir constituent des méthodes adéquates pour l'inventaire des Muscidae nordiques. Nous observons peu de différence entre les estimations de la richesse et de la composition spécifiques entre les récoltes au filet fauchoir des deux périodes. Dans l'ensemble combiné du matériel de l'inventaire de 2007, 87% des espèces de la période antérieure à 1965 ont été récoltées de nouveau en 2007. La plupart des espèces qui ne se retrouvent pas à la fois dans les inventaires des deux périodes sont peu abondantes dans les prélèvements et(ou) ont été récoltées par des méthodes différentes, ce qui indique que la non détection est l'explication la plus vraisemblable de leur absence dans l'un ou l'autre des peuplements. Néanmoins, la proportion des espèces aquatiques et semi-aquatiques de Spilogona Schnabl est plus de deux fois plus élevée dans la liste des espèces non retrouvées en 2007 que dans le peuplement d'avant 1965.

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The Canadian Entomologist
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  • EISSN: 1918-3240
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