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Effects of trap height on captures of arboreal insects in pine stands of northeastern United States of America

Published online by Cambridge University Press:  17 October 2013

Kevin J. Dodds
Kevin J. Dodds*
Affiliation:
United States Department of Agriculture Forest Service, Forest Health Protection, 271 Mast Road, Durham, New Hampshire 03824, United States of America
*
1 Corresponding author (e-mail: [email protected]).
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Abstract

Knowledge of the effects of variables that can influence trapping results should help to optimise efforts in exotic species detection and other surveys. Two vertical trap placements (understorey, canopy) were tested to determine influence of these two heights on captures of Scolytinae (Coleoptera: Curculionidae), Cerambycidae (Coleoptera), and Siricidae (Hymenoptera) using semiochemical-baited multiple-funnel traps. Traps were baited with α-pinene, ethanol, ipsdienol, and ipsenol. A total of 8463 insects from 65 species and one genus were captured during the study. Average species richness, species diversity, abundance, number of unique species, and expected diversity were higher in understorey compared with canopy traps. Jaccard (0.94 ± 0.05) and Sørensen abundance (0.97 ± 0.03) similarity indices suggested highly similar communities sampled at the two trap heights. Dendroctonus valens LeConte, Dryocoetes autographus Ratzeburg, Hylastes opacus Erichson, Orthotomicus caelatus (Eichhoff), Gnathotrichus materiarius (Fitch), Asemum striatum (Linnaeus), Monochamus scutellatus scutellatus (Say), Rhagium inquisitor (Linnaeus), and Xylotrechus sagitattus sagitattus (Germar) were more abundant in understorey traps. In contrast, Ips pini (Say), Pityogenes hopkinsi Swaine, Monochamus carolinensis (Olivier), Acmaeops proteus (Kirby), and Astylopsis sexgutatta (Say) were more abundant in canopy traps. The common practice of trapping in the understorey may be optimal for sampling arboreal insects as part of survey efforts. However, additional species may be found by trapping at other vertical placements.

Résumé

Une connaissance des effets des variables qui peuvent influencer les résultats de piégeage devrait permettre d'optimiser les efforts de détection des espèces exotiques et d'inventaires divers. Nous avons évalué l'influence de deux positions verticales (sous-bois et canopée) de pièges à entonnoirs multiples munis d'appâts sémiochimiques sur les captures de Scolytinae (Coleoptera: Curculionidae), de Cerambycidae (Coleoptera) et de Siricidae (Hymenoptera). Les pièges ont été munis d’α-pinène, d’éthanol, d'ipsidiénol et d'ipsénol. En tout, 8463 insectes représentant 65 espèces et un genre ont été récoltés durant l’étude. La richesse spécifique moyenne, la diversité spécifique, l'abondance, le nombre d'espèces uniques et la diversité attendue sont plus élevés dans les pièges du sous-bois que dans ceux de la canopée. Les indices de similarité de Jaccard (0,94 ± 0,05) et de Sørensen (0,97 ± 0,003) laissent croire que des communautés très semblables ont été échantillonnées aux deux niveaux de pièges. Dendroctonus valens LeConte, Dryocoetes autographus Ratzeburg, Hylastes opacus Erichson, Orthotomicus caelatus (Eichhoff), Gnathotrichus materiarius (Fitch), Asemum striatum (Linnaeus), Monochamus scutellatus scutellatus (Say), Rhagium inquisitor (Linnaeus) et Xylotrechus sagitattus sagitattus (Germar) étaient plus abondants dans les pièges dans le sous-bois. En revanche, Ips pini (Say), Pityogenes hopkinsi Swaine, Monochamus carolinensis (Olivier), Acmaeops proteus (Kirby) et Astylopsis sexgutatta (Say) étaient plus abondants dans les pièges de la canopée. La pratique courante de placer les pièges dans le sous-bois peut être optimale pour l’échantillonnage des insectes arboricoles lors de travaux d'inventaire. Cependant, on peut obtenir des espèces additionnelles en fixant les pièges à d'autres hauteurs.

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Information
The Canadian Entomologist , Volume 146 , Issue 1 , February 2014 , pp. 80 - 89
Copyright
Copyright © Entomological Society of Canada 2013. This is a work of the U.S. Government and is not subject to copyright protection in the United States 

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Footnotes

Subject editor: Staffan Lindgren

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