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The relationship between light- and suction-trap catches of Chrysoperla carnea (Stephens) (Neuroptera: Chrysopidae), and the adjustment of light-trap catches to allow for variation in moonlight

Published online by Cambridge University Press:  10 July 2009

John Bowden
John Bowden
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, UK
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Abstract

Analysis of catches of Chrysoperla carnea (Steph.) in a light-trap and a suction trap at Rothamsted, southern England, showed that the light-trap catch varied as predicted from a model proposed to describe the functioning of a light-trap: catch = constant × , where W = trap illumination and I = background illumination. After adjustment to allow for changes in illumination during the flight period of C. carnea, the light-trap catch was very similar to the suction-trap catch. For C. carnea, a light-trap provides as unbiased a sample as a suction trap, but because of variation in trap effectiveness with variation in illumination, light-trap catches obscure changes in activity and abundance. Although similar studies are desirable to confirm this for other species, it is suggested that in light-trap studies catches should be adjusted to allow for changes in illumination during flight or trapping periods.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 71 , Issue 4 , December 1981 , pp. 621 - 629
Copyright
Copyright © Cambridge University Press 1981

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