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INFLUENCE OF WIND ON THE SPRING FLIGHT OF TRYPODENDRON LINEATUM (OLIVIER) (COLEOPTERA: SCOLYTIDAE) IN A SECOND-GROWTH CONIFEROUS FOREST

Published online by Cambridge University Press:  31 May 2012

S.M. Salom  and
J.A. McLean
S.M. Salom
Affiliation:
Faculty of Forestry, University of British Columbia, Vancouver, British Columbia, Canada V6T 1W5
J.A. McLean
Affiliation:
Faculty of Forestry, University of British Columbia, Vancouver, British Columbia, Canada V6T 1W5
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Abstract

A mark–recapture study examined the spring flight dispersal of the ambrosia beetle, Trypodendron lineatum (Olivier), in an even-aged second-growth coastal forest in British Columbia. Pheromone-baited traps were placed in circular traplines at distances from 5 to 500 m from a central release location to (1) examine the relationship between wind direction and beetle catches in traps arranged around the release point, and (2) evaluate beetle catch characteristics when distances to baited traps were varied. A total of 29 800 marked beetles were released in three experiments. Upwind flight was most strongly exhibited at 5 m, with an upwind trend at 25 m, and no consistent flight pattern at 100 m, when wind movement was significantly directed. When the closest attraction was 100 m from the release point, beetles were caught uniformly in all directions indicating that flight was non-directional with respect to wind, for light wind speeds. Catches at 500-m traps tended to be downwind, thus beetles capable of flying that distance were ones that were flying with the wind. Equal numbers of beetles were captured at 5, 25, and 100 m despite increased intertrap spacings of 8, 20, and 32 m, respectively. A higher proportion of beetles were captured at 100 m when close-range traps at 5 and 25 m were not present.

Résumé

Une étude de marquage–recapture a permis d’examiner l’envoi de dispersion du scolyte Trypodendron lineatum (Olivier), dans une forêt côtière d’âge uniforme de repousse en Colombie Britannique. Des pièges à phéromones ont été placés en cercle à des distances de 5 à 500 m d’un point central de libération afin de (1) étudier la relation entre la direction du vent et les captures dans les pièges disposés autour du point de libération, et (2) évaluer les caractéristiques de capture en fonction de la distance du piège. On a libéré 29 800 scolytes marqués lors de trois tests. Le vol à contre-vent s’est manifesté le plus fortement à 5 m; on a observé une tendance au vol à contrevent à 25 m, mais aucune tendance à 100 m, alors que le mouvement du vent était significativement orienté. Lorsque les pièges les plus près étaient à 100 m du point de libération, on a capturé des scolytes dans toutes les directions, indiquant que le vol n’était pas orienté par rapport au vent à faible vitesse. A 500 m, les captures avaient tendance à provenir de l’amont, indiquant que les scolytes pouvant voler sur cette distance volaient avec le vent. Les nombres de captures à 5, 25 et 100 m étaient égaux, malgré l’augmentation concurrente de la distance inter-piège qui était de 8, 20 et 32 m, respectivement. On a capturé une proportion plus élevée de scolytes à 100 m, lorsque des pièges rapprochés n’étaient pas présents à 5 et 25 m.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 2 , February 1989 , pp. 109 - 119
Copyright
Copyright © Entomological Society of Canada 1989

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