Evaluating shading bias in malaise and intercept traps

Journal of the Acadian Entolomgical Society
By:  and 



Foresters are increasingly focusing on landscape level management regimes. At the landscape level, managed acreage may differ substantially in structure and micro-climatic conditions. Trapping is a commonly used method to evaluate changes in insect communities across landscapes. Among those trapping techniques, Malaise and window-pane traps are conveniently deployed to collect large numbers of insects for relative estimates of density. However, the catch within traps may be affected by a wide range of environmental variables including trap location, height, and factors such as exposure to sunlight and temperature. Seven experiments were conducted from 1996 through 2000 to evaluate the effects of shading on trap catch of a variety of Malaise trap designs and one window-pane trap design. Overall, differences in shading effects on trap catch were detected across different traps and taxa and suggested that, in general, more insects are collected in traps that were in direct sunlight. The effect of shading varied from a reduction in trap catch of 10 % to an increase of 7%, the results depended on trap color. Diptera, Coleoptera, and Homoptera were most likely to exhibit this bias. In contrast, trap catch of the Hymenoptera was the most variable and appeared to be sensitive to factors that might interact with sun/shade conditions

Publication type Article
Publication Subtype Journal Article
Title Evaluating shading bias in malaise and intercept traps
Series title Journal of the Acadian Entolomgical Society
Volume 3
Year Published 2007
Language English
Publisher The Acadian Entomological Society
Contributing office(s) Northern Rocky Mountain Science Center
Description 11 p.
First page 38
Last page 48
Online Only (Y/N) N
Additional Online Files (Y/N) N
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