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Abundance of some native coccinellines (Coleoptera: Coccinellidae) before and after the appearance of Coccinella septempunctata1

Published online by Cambridge University Press:  02 April 2012

W.J. Turnock
Affiliation:
Agriculture and Agri-Food Canada, Cereal Research Centre, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
I.L. Wise*
Affiliation:
Agriculture and Agri-Food Canada, Cereal Research Centre, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
F.O. Matheson
Affiliation:
Agriculture and Agri-Food Canada, Cereal Research Centre, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
*
2Corresponding author (e-mail: iwise@agr.gc.ca).

Abstract

The seven-spotted lady beetle, Coccinella septempunctata L., was first reported in Manitoba in 1988. The effect of this introduced species on the relative abundance of the more common native coccinellines was determined from D-Vac Insect Net® and sweepnet samples in alfalfa in 1983–2001, by sweepnet and visual sampling in field crops and other vegetation in 1989–2001, and by transect sampling of aggregations of coccinellines in spring and autumn on the shore of Lake Manitoba from 1989 to 2001. The trends of annual changes in the abundance of six species in southern Manitoba were similar, whether based on the mean density per 200 sweeps in alfalfa or on their relative abundance in alfalfa, on other vegetation, and in aggregations on the beach. Before 1988, Hippodamia tredecempunctata tibialis (Say), Coccinella transversoguttata richardsonii Brown, and Hippodamia convergens Guerin were the most abundant species, followed by Hippodamia parenthesis (Say) and Coccinella trifasciata perplexa Mulsant. By 1992, C. septempunctata had become the dominant species, but H. tredecempunctata has since been the dominant species in most collections. The relative abundance of C. transverso guttata, H. convergens, H. parenthesis, and C. trifasciata has decreased since the establishment of C. septempunctata. The decline in abundance of these species seems to be caused by their competitive displacement by C. septempunctata. Their displacement also might be a contributing factor in the slight increase in abundance of H. tredecempunctata because C. septempunctata may compete less directly with this species than with other native coccinellines.

Résumé

La coccinelle à sept points, Coccinella septempunctata L., a été vue pour la première fois au Manitoba en 1988. Les effets de cette espèce introduite sur l'abondance relative des espèces les plus communes de Coccinellinae indigènes ont été déterminés à partir d'échantillons recueillis à l'aspirateur D-VacMD et au filet fauchoir dans de champs de luzerne en 1983–2001, au filet fauchoir et par échantillonnage visuel en 1989–2001 dans des cultures et d'autre végétation en 1989–2001 et par échantillonnage des regroupements de Coccinellinae le long de transects au printemps et en automne sur les rives du lac Manitoba. Les variations annuelles de l'abondance suivent les mêmes tendances chez six espèces du sud du Manitoba, que ces tendances soient estimées à partir de la densité moyenne des récoltes calculée sur 200 coups de filet dans de la luzerne ou de l'abondance relative dans la luzerne, dans d'autre végétation et dans les regroupements sur la plage. Avant 1988, Hippodamia tredecempunctata tibialis (Say), Coccinella transversoguttata richardsonii Brown et Hippodamia convergens Guerin étaient les espèces les plus abondantes, suivies d'Hippodamia parenthesis (Say) et de Coccinella trifasciata perplexa Mulsant. En 1992, C. septempunctata était devenue l'espèce la plus abondante, mais depuis ce temps, H. tredecempunctata domine dans la plupart des échantillons. L'abondance relative de C. transversoguttata, H. convergens, H. parenthesis et C. trifasciata a diminué depuis l'établissement de C. septempunctata. La diminution de l'abondance de ces espèces semble attribuable à leur remplacement par compétition par C. septempunctata. Ce remplacement peut aussi être en partie responsable de la légère augmentation de l'abondance d'H. tredecempunctata, parce que C. septempunctata fait une compétition moins directe à cette espèce qu'aux autres.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 2003

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Footnotes

1

Contribution No. 1833 of the Cereal Research Centre, Agriculture and Agri-Food Canada, Winnipeg, Manitoba.

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