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SEASONAL DISTRIBUTION AND PARITY OF HOST-SEEKING HORSE FLIES (DIPTERA: TABANIDAE) FROM A PASTURE NEAR SEVEN SISTERS, MANITOBA

Published online by Cambridge University Press:  31 May 2012

Paul E.K. McElligott  and
Terry D. Galloway
Paul E.K. McElligott
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
Terry D. Galloway
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
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Abstract

Twenty species of Tabanidae in three genera [Hybomitra (15 spp.), Tabanus (four spp.), Haematopota (one sp.)] were caught in Manitoba horse fly traps from mid-May to mid-July in 1987, and from mid-May to mid-August in 1988. Hybomitra lurida (Fallen) and H. nitidifrons nuda (McDunnough) peaked in abundance in late May to early June; H. illota (Osten Sacken) and H. lasiophthalma (Macquart) in early June; H. affinis (Kirby), H. arpadi (Szilady), and H. zonalis (Kirby) in mid-June; H. epistates (Osten Sacken) and H. pechumani Teskey and Thomas in late June to early July. Abundance of H. trepida (McDunnough) peaked twice, in late June and early August. Tabanid density and diversity were greatest during June; few flies were present at the site after mid-July. For most species, at the beginning of the flight season, 80–100% of flies dissected were nulliparous. After approximately 1 month of flight activity, parity in all but three species reached levels approaching 100%, and remained high thereafter. Hybomitra lurida and H. nitidifrons nuda were 100% parous within 2 weeks of their first appearance in traps. Parity of H. trepida increased to 100% after 4 weeks, declined to 40% 2 weeks later, and returned to 100% after another 2 weeks.

Résumé

Vingt espèces de taons, appartenant à trois genres (Hybomitra, 15 espèces; Tabanus, quatre espèces; Haematopota, une espèce) ont été prises dans les pièges de taons du Manitoba à partir de la mi-mai jusqu’à la mi-juillet en 1987 et à partir de la mi-mai jusqu’à la mi-août en 1988. Hybomitra lurida (Fallen) et H. nitidifrons nuda (McDunnough) ont atteint leurs apogées d’abondance à partir de la fin de mai au commencement de juin; H. illota (Osten Sacken) et H. lasiophthalma (Macquart) au début de juin; H. affinis (Kirby), H. arpadi (Szilady), et H. zonalis (Kirby) à la mi-juin; H. epistates (Osten Sacken) et H. pechumani Teskey et Thomas à partir de la fin de juin jusqu’au début de juillet. L’abondance de H. trépida (McDunnough) a atteint une apogée par deux fois, tard au mois de juin et encore de bonne heure au mois d’août. La densité et la diversité des taons ont été des plus importantes pendant le mois de juin; peu de mouches ont été présentes au site après la mi-juillet. En ce qui concerne la plupart d’espèces, au début de la saison de vol, 80–100% des taons disséqués ont été nullipares. Suite de 1 mois d’activité de vol approximativement, la parité a atteint des niveaux proche de 100%, sauf en ce qui concerne trois espèces, et elle a resté élevée par après. Hybomitra lurida et H. nitidifrons nuda ont atteint 100% de parité en dedans de 14 jours de leur première apparition dans les pièges. La parité de H. trepida a augmenté à 100% après 4 semaines, a diminué 14 jours plus tard à 40%, et est revenue à 100% suite d’une autre période de 14 jours.

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 2 , April 1991 , pp. 361 - 370
Copyright
Copyright © Entomological Society of Canada 1991

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